🥖 10 Species Including Ducks, Geese, Quail, Turkey and Guinea
Free Egg Hatching Date Calculator: Incubation Timeline, Lockdown and Candling Dates
Built and reviewed by David (MBA Finance) · Updated October 2026
Enter your incubation start date or target hatch date for any of 10 common poultry species. Instantly get first and second candling dates, lockdown day, expected hatch date, hatch window, and full temperature and humidity guidance. Includes PDF calendar report and WhatsApp share.
📅 10 Poultry Species🔎 Candling Reminder Dates🔒 Lockdown Countdown🌡 Temp and Humidity Guide💧 Duck Cooling Schedule📄 PDF Report
🥖Egg Hatching Date CalculatorMilestones, lockdown, and hatch window for 10 species
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Select species, enter date, and click Calculate
Get your full incubation calendar: candling dates, lockdown day, expected hatch, and species-specific guidance.
Expected Hatch Date
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Incubation Start (Day 0)
Eggs set in incubator
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🔎
First Candling
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🔎
Second Candling
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🔒
Lockdown
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Expected Hatch
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🌡 Species Incubation Guidance
Total Days
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Egg Turning
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Forced-Air Temp
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Still-Air Temp
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Humidity (Incubation)
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Humidity (Lockdown)
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💧 Waterfowl Cooling Requirement
Visual Incubation Timeline: Phases by Days
Shows the four incubation phases as a proportional horizontal timeline. Run the calculator to populate with your selected species.
What Happens Inside an Egg: Understanding the Incubation Timeline for US Backyard Flock Owners
Incubation is not a passive waiting game. From the moment you set fertilized eggs in a warm incubator, a biological clock starts ticking through a precise developmental sequence. Every critical action you take during incubation, from checking fertility to adjusting humidity, is anchored to a specific point in that countdown. Getting the timeline right is what separates a 90 percent hatch rate from a 50 percent one.
The egg hatching date calculator above gives you four specific dates to mark on your calendar for any incubation project: first candling, second candling, lockdown, and expected hatch. Each of these events corresponds to a concrete change in how you manage the eggs. Missing lockdown by even one day can kill chicks that have already internally pipped but cannot break through the membrane without sufficient humidity. Missing the first candling leaves infertile or early-dead eggs in the incubator where they can go rotten and contaminate the entire clutch.
What Is Candling and Why Does the Timing Matter
Candling is the process of shining a bright light (originally a candle, now an LED candler) through the eggshell to observe development inside. At day 7 for chickens, a healthy fertilized egg shows a spider-web of blood vessels, a dark eye spot, and a moving embryo. An infertile egg is clear. A dead embryo shows a blood ring (a ring of blood cells where the embryo began developing and stopped).
The timing of candling matters for two reasons. Candle too early (before day 5 or 6 for chickens) and you cannot see enough development to make a reliable assessment. Candle too late and a rotten egg can explode in the incubator, releasing bacteria that can penetrate the porous shells of developing embryos and kill healthy chicks. University Extension Poultry resources recommend removing clear and blood-ring eggs at the first candling (day 7-10) and removing any remaining questionable eggs at the second candling (day 14-18 for chickens).
What Is Lockdown and Why Three Days Before Hatch
Lockdown is the final phase of incubation that begins three days before the expected hatch date. During lockdown, you stop turning the eggs, increase humidity significantly (typically from 50-55 percent to 65-70 percent for chickens), and avoid opening the incubator except in genuine emergencies. The three-day window corresponds to when chicks internally pip (break through the inner membrane into the air cell) and begin the slow process of breaking through the outer shell.
During this critical period, the developing chick is absorbing the remaining yolk sac and drawing oxygen from the air cell. If humidity is too low, the membrane can stick to the chick and prevent it from turning inside the egg to complete the external pip. If you open the incubator during this period, you drop the humidity rapidly and can dry out the membrane around a chick that is mid-pip. The three-day lockdown window is not an approximation: it reflects the biological reality of what is happening inside the shell.
Why Waterfowl Eggs Need a Different Protocol Than Chicken Eggs
Duck, goose, and Muscovy eggs have biological needs that standard chicken incubation does not address. In nature, a sitting duck or goose leaves the nest once or more per day to eat, drink, preen, and often swim. During that time, the eggs cool down and are exposed to fresh air. This cooling and the moisture from the mother’s wet feathers when she returns play an active role in embryo development and shell permeability.
In an incubator, replicating this means a daily cooling and misting protocol starting around day 7 for Mallard-derived ducks (day 10 for Muscovy and geese). The cooling, typically 10 to 15 minutes with the fan off and the lid open, allows the air inside the egg to contract and then re-expand as it warms, which helps with oxygen exchange. Lightly misting with warm water during the cooling period replaces the moisture the mother’s wet feathers would normally provide. Skipping this step does not always result in failure, but hatch rates for waterfowl consistently improve when it is followed.
How This Egg Hatching Date Calculator Works: Dual Mode for Forward and Backward Planning
This calculator operates in two modes. The forward mode (From Set Date to Hatch) is the most common: you enter the date you placed eggs in the incubator, and the calculator returns every milestone date through the expected hatch. The backward mode (From Target Hatch to Set Date) is used by small farm producers and homesteaders who need chicks by a specific date, such as ensuring a batch of broilers is ready before summer heat, or timing laying pullets to start producing eggs before winter. The backward mode tells you exactly when to set eggs to hit your target hatch date.
All milestone calculations are calendar-day arithmetic: lockdown is always three days before the expected hatch date (the lockdown day number in the species data), first candling is the recommended day for that species to first check for fertility, and second candling is the recommended day to make a final removal decision before lockdown.
The hatch window shown (plus or minus one day around the expected date) reflects the reality that incubation timing is influenced by temperature stability, egg age at setting, and incubator position. Most healthy hatches occur within 24 hours of the calculated date. Temperatures consistently one or two degrees above the ideal will pull the hatch earlier; temperatures below ideal will push it later.
Three Real US Incubation Scenarios: Dates That Actually Come Up
Backyard Flock Owner in Iowa: Chickens Set January 10 for Spring Chicks
A hobby farmer sets 18 fertilized eggs from a local breeder on January 10 for a batch of Rhode Island Red and Barred Rock chicks. They want spring pullets for egg laying starting in late summer.
🔎 First Candling: January 17 (Day 7)
🔎 Second Candling: January 24 (Day 14)
🔒 Lockdown: January 28 (Day 18)
🥖 Expected Hatch: January 31 (Day 21)
Window: January 30 to February 1. At 99.5 F forced-air, 50-55% humidity increasing to 65-70% at lockdown.
Texas Homestead Duck Hatch: Pekin Eggs Set March 1 for Backyard Pond
A Texas family sets 12 Pekin duck eggs (Mallard-derived) on March 1. They begin the daily cooling protocol starting day 7, misting with warm water on alternate days.
💧 Begin Cooling: March 8 (Day 7)
🔎 First Candling: March 8 (Day 7)
🔒 Lockdown: March 26 (Day 25)
🥖 Expected Hatch: March 29 (Day 28)
Window: March 28 to March 30. Humidity 55-60% during incubation, raised to 70-75% at lockdown. Stop cooling at lockdown.
Virginia Small Farm: Turkey Poults Needed by May 20, Work Backwards
A Virginia farmer needs Broad Breasted Bronze turkey poults ready by May 20 for a Thanksgiving meat market schedule. Using backward mode to find the correct set date.
← Target Hatch: May 20
✅ Set Eggs: April 22 (Day 0)
🔒 Lockdown: May 17 (Day 25)
🔎 Candle: April 29 and May 6
Turkey incubation: 28 days total. Temperature 99.5 F forced-air, 55-60% humidity, lockdown at day 25. Hatch window May 19-21.
Expert Incubation Tips for Backyard Poultry Keepers and Small Farm Producers
Tip 01
Mark Your Calendar with All Four Milestone Dates Before You Set Eggs
The single most effective habit in incubation is writing down all four dates (first candling, second candling, lockdown, expected hatch) before you even close the incubator. Life gets busy. A chick that needs lockdown on a specific Tuesday morning will not wait while you try to remember what day the eggs went in. The PDF report from this calculator gives you a complete calendar to print and post near your incubator.
Tip 02
Stabilize Your Incubator 24 Hours Before Setting Any Eggs
Run your incubator empty for 24 hours before setting eggs. This allows the thermostat to cycle and stabilize at the target temperature and gives you time to check and adjust before irreplaceable fertilized eggs go in. Temperature spikes in the first hour of incubation are far more damaging than the same spike during mid-incubation. A calibrated digital thermometer with a probe at egg level (not the incubator’s built-in display) gives you the most accurate reading.
Tip 03
Store Eggs Correctly Before Setting to Maximize Fertility
Fertilized eggs stored before incubation should be kept at 55 to 65 degrees Fahrenheit, pointed end down, in a slightly humid environment, and turned once or twice daily. Hatchability drops significantly after seven days of storage and plummets after 14 days. If you receive shipped eggs, let them rest pointy-end-down at room temperature for 12 to 24 hours before incubating. This allows the air cell to stabilize after shipping movement.
Tip 04
Never Set an Alarm for Exact Hatch Time: Give Chicks a Full 24-48 Hours
New hatchers often panic when nothing has happened by the calculated hatch date. Chickens are biologically programmed to hatch as a group, and the first pip to emergence takes 12 to 24 hours in a healthy chick. Do not help a chick that is in the process of hatching unless it has been stuck in the same position without movement for more than 24 hours. Premature assistance tears blood vessels and kills more chicks than it saves. Give your hatch window a full two to three days before intervening.
Tip 05
Wet-Bulb Hygrometers Outperform Digital Humidity Sensors for Incubation
Most cheap digital hygrometers sold with incubators have accuracy ratings of plus or minus 5 percent, which is a large margin when your target is 50 to 55 percent. A wet-bulb and dry-bulb thermometer system, which measures relative humidity by calculating the difference between two readings, is more accurate and does not drift over time. For lockdown, when humidity precision matters most, a wet-bulb reading of 86 to 88 degrees Fahrenheit indicates approximately 65 to 70 percent relative humidity in a forced-air incubator at 99.5 F.
Tip 06
Power Outages Are Survivable: Know What to Do
Eggs in mid-incubation can withstand temperature drops better than most new hatchers fear. Embryos can survive drops to 65 to 70 degrees Fahrenheit for up to 12 hours, particularly during days 7 through 18 of chicken incubation. Do not open the incubator during an outage: keep it closed to preserve heat. Cover it with blankets for insulation. When power returns, do not try to rush the temperature back up: let the thermostat regulate normally. Resume your turning schedule. Brief outages in mid-incubation rarely result in total loss.
Quick Reference: Incubation Days and Milestones by Poultry Species
All timing is calendar days. Lockdown day is total incubation minus 3 days for all species. Temperature and humidity values are for standard forced-air incubators. Still-air incubators require higher temperature readings at the top of the egg. Source data: Extension Poultry, USDA NIFA, and university extension poultry programs.
Species
Total Days
1st Candle
2nd Candle
Lockdown Day
Forced-Air Temp
Humidity (Inc.)
Humidity (Lock.)
Chicken
21
Day 7
Day 14
Day 18
99.5 F
50-55%
65-70%
Duck (Mallard) Cooling
28
Day 7
Day 14
Day 25
99.5 F
55-60%
70-75%
Muscovy Duck Cooling
35
Day 10
Day 21
Day 32
99.5 F
55-60%
75%
Goose Cooling
30
Day 10
Day 21
Day 27
99.5 F
55-60%
70-75%
Turkey
28
Day 7
Day 14
Day 25
99.5 F
55-60%
65-70%
Coturnix Quail
17
Day 7
Day 14
Day 14
99.5 F
45-50%
65-70%
Bobwhite Quail
23
Day 7
Day 14
Day 20
99.5 F
45-50%
65-70%
Guinea Fowl
28
Day 10
Day 21
Day 25
99.5 F
50-55%
65-70%
Peafowl
28
Day 7
Day 21
Day 25
99.5 F
55-60%
70-75%
Pheasant
24
Day 7
Day 14
Day 21
99.5 F
50-55%
65-70%
Cooling badge indicates daily egg cooling required starting on the day shown. All temperatures are at egg level in a forced-air incubator. Still-air incubators should read 101 to 102 F at the top of the eggs.
Egg Incubation Questions from US Backyard Flock Owners
The calculator gives you the statistically most likely hatch date based on the published standard incubation period for each species. In practice, most healthy clutches hatch within 24 hours of the calculated date. The actual timing depends on your incubator’s temperature accuracy, the age of the eggs when set (fresher eggs often hatch slightly faster), the position of eggs in the incubator (eggs nearer the heat source may develop faster), and natural biological variation between individual eggs. Setting up your incubator with a calibrated thermometer and maintaining stable temperature is the single biggest factor in hitting the predicted date. The calculator provides the hatch window of plus or minus one day to give a realistic range rather than a false sense of precision.
A forced-air (circulated air) incubator uses a fan to keep air moving evenly throughout the cabinet, which keeps temperature uniform at all positions. The target temperature is 99.5 degrees Fahrenheit measured at any point inside the incubator. A still-air incubator has no fan, which creates a temperature gradient from warmer at the top to cooler at the bottom. Eggs are set in the middle of the incubator, and you measure temperature at the TOP of the eggs. The target reading at the top of the eggs in a still-air incubator is 101 to 102 degrees Fahrenheit. Because the egg itself is at approximately 99.5 F in this arrangement (the gradient evens out at the egg), the embryo is at the correct developmental temperature. The higher reading at egg-top in a still-air incubator is NOT running hot: it reflects the temperature gradient, not overheating.
The difference traces back to the natural incubation behavior of each species. A broody hen rarely leaves her nest during incubation, keeping eggs warm and humid continuously. A broody duck or goose, by contrast, leaves the nest daily to feed, drink, and swim. While off the nest, the eggs cool to ambient temperature and are exposed to drier air before being covered again by the mother’s wet plumage. Research on waterfowl incubation, including studies from university poultry extension programs, has consistently shown that replicating this cooling cycle in artificial incubation improves hatch rates for ducks and geese. The cooling also helps with the gas exchange dynamics of waterfowl eggshells, which are thicker and less porous than chicken eggs. The practical result is that artificial incubation of duck and goose eggs achieves significantly better results when the daily cooling protocol is followed from day 7 onward.
A fertile, developing egg at day 7 shows a dark central mass (the embryo) connected to a web of blood vessels spreading toward the shell. If you look closely, you may see the heartbeat as a rhythmic pulsing of the dark center. The egg has an overall pinkish or reddish glow from the blood vessel network. A clear or infertile egg transmits light evenly with no dark mass or blood vessels: the yolk may be visible as a faint shadow but there is no blood vessel network. A dead embryo (called a blood ring or early quitter) typically shows a ring of blood near the center, often with a dark streak but no organized vessel network. Blood rings should be removed immediately. When in doubt about an egg’s status at day 7, mark it with a pencil and recheck at day 10: a developing embryo will be noticeably larger and easier to confirm.
The most common cause of early hatching is incubator temperature running slightly above the ideal. Even half a degree above 99.5 F over the full incubation period can pull a chicken hatch forward by 12 to 24 hours. The most common cause of late hatching is temperature running slightly below ideal, or eggs that were older when set. Eggs stored for more than 7 days before setting consistently hatch later than freshly set eggs. Large eggs take longer than small eggs even within the same species. Position in the incubator can also affect timing: eggs sitting closer to the heating element may develop slightly faster than eggs on the perimeter. If you experience consistently early or late hatches, calibrate your thermometer against a known-accurate reference thermometer before your next incubation cycle.
The general recommendation from poultry extension programs is to not assist hatching unless a chick has made visible progress (pipped the shell) but has not moved or progressed for 24 hours. Helping too early is dangerous because blood vessels in the membrane may not have fully receded, and pulling the shell away prematurely tears those vessels and kills the chick. If you decide to assist, first increase humidity to near 100 percent for 30 to 60 minutes before starting. Chip away tiny pieces of shell around the pip, pausing to check for blood in the membrane. If you see blood, stop immediately: the vessels have not receded, and the chick needs more time. Remove only enough shell to give the chick access to fresh air, then leave it to finish emerging on its own over the next several hours. Most chick mortality attributed to difficulty hatching is actually caused by premature assistance rather than by the hatching difficulty itself.
You can incubate multiple species together, but you need to manage lockdown dates carefully since different species go into lockdown at different points. The common approach is to set eggs so they all hatch on the same day, which means starting longer-incubation species earlier. For example, to hatch chicken eggs (21 days) and duck eggs (28 days) together, you would set the duck eggs 7 days before the chicken eggs. The challenge is that the duck eggs will be in the middle of incubation (and still need turning) when the chicken eggs go into lockdown. Many hatchers use a separate small incubator or hatcher for lockdown so they can manage the humidity and no-turning requirement for hatching eggs without affecting eggs still in active incubation. Temperature and humidity requirements for chickens and ducks are close enough that cohabitation during the main incubation phase is manageable.
The recommended humidity during lockdown for chicken eggs is 65 to 70 percent relative humidity (RH). Some experienced hatchers use slightly lower (60 to 65 percent) and some use higher (up to 75 percent) depending on their local climate and specific incubator. The purpose of higher lockdown humidity is to keep the membrane lining the eggshell moist and pliable so that as the chick rotates and pushes against it, the membrane stretches rather than sticking to the chick. In very dry climates (low natural humidity), you may need to add more water to your incubator water channels or use a wet sponge. In humid climates, ambient air may already provide enough additional moisture. A rough check: if chicks are hatching with dried membrane clinging to them, your lockdown humidity was too low. If the hatched chicks are very wet and the egg carton floor of your incubator is pooled with water, humidity was too high.
Eggs should be turned a minimum of 3 times per day and ideally 5 times per day during the active incubation period. Turning should stop completely at lockdown. The reason for turning is to prevent the developing embryo from sticking to the membrane on one side of the shell, which would damage or kill it. In nature, a broody hen turns her eggs continuously throughout the day by adjusting her position, rocking, and standing. Automatic egg turners in most incubators turn eggs every hour. If turning by hand, use an odd number of turns per day (3 or 5) so the egg rests on a different side each night. Mark each egg with an X on one side and an O on the other in pencil to keep track of which way it has been turned. Stop all turning when lockdown begins.
Coturnix quail (also called Japanese quail) have an incubation period of 17 days, the shortest of common backyard poultry species. This is a function of egg size and developmental rate relative to body size. Quail eggs are much smaller than chicken eggs (5 to 10 grams versus 50 to 60 grams for chicken), which means less total development required. The embryo-to-egg-mass ratio is also higher in quail, supporting faster development. The 17-day incubation makes Coturnix quail particularly attractive for small farm egg production because you can cycle multiple hatches per month in the same incubator. One important note for Coturnix: lockdown occurs on day 14, which coincides with what would be the second candling. Candle first on day 14 to remove any non-developing eggs, then immediately switch to lockdown mode (stop turning, raise humidity, do not open).
Fertilized eggs should NOT be stored in a refrigerator before incubation. Refrigerator temperatures (35 to 40 degrees Fahrenheit) are too cold for hatching eggs and damage the embryo. Hatching eggs should be stored at 55 to 65 degrees Fahrenheit, ideally in a cool basement, garage, or spare room. The best hatchability occurs when eggs are stored for 3 to 7 days or fewer before incubation. Hatchability declines noticeably after 7 days and drops sharply after 14 days for most species. Store eggs with the pointed end down (or on their side, slightly elevated at the pointed end), and turn them once or twice per day if storing for more than a few days. Avoid storing hatching eggs in direct sunlight, near heat vents, or in areas where temperatures fluctuate significantly, such as near frequently opened exterior doors.
There are several signs a developing egg has died during incubation. When candling, a dead embryo appears as a dark mass without movement, often accompanied by a visible dark ring (blood ring) around the yolk. After day 14 in chicken incubation, a dead egg shows a dark or mottled interior without the organized vessel structure of a living egg. The most unmistakable sign is smell: a rotten egg produces hydrogen sulfide gas with a distinctive sulfurous odor. If you detect this smell when opening the incubator, identify and remove the bad egg immediately. A rotten egg under sufficient internal gas pressure can crack or explode, contaminating healthy eggs with bacteria that penetrate the porous shell. Gently handle any suspected bad egg; if it makes a faint sloshing sound when carefully tilted, the contents have liquefied and the egg should be carefully removed.
Have the brooder set up and warmed to the correct temperature before hatch day so you can move chicks as soon as they are dry and fluffy. For chickens, the brooder temperature at chick level for the first week is 95 degrees Fahrenheit, reduced by 5 degrees each week until chicks are fully feathered at around 6 weeks. Use a heat lamp or radiant heat plate, not a heat pad (chicks need overhead heat). Set up a chick feeder with chick starter crumble (22 to 24 percent protein for meat breeds, 18 to 20 percent for layer breeds) and a small waterer with clean water. Do NOT put chicks under a heat lamp immediately from the incubator: let them fully dry and fluff in the incubator first (usually 12 to 24 hours after hatch). Wet chicks under a heat lamp can overheat or chill unevenly. The USDA NIFA Beginning Farmer program provides additional poultry setup guidance for new small farm operations.
Several factors cause eggs within the same clutch to hatch at different times. Position in the incubator is the most common cause: eggs nearer the heat source develop slightly faster. Egg size matters too, as smaller eggs often hatch before larger ones. The age of eggs when set can vary if they were collected over several days before incubating. Individual genetic variation between embryos affects development rate. A well-maintained forced-air incubator with consistent temperature and humidity minimizes hatch spread, but a spread of 12 to 48 hours within a single clutch is normal and healthy. If you see spreads of more than 48 hours in a chicken clutch from eggs set on the same day, investigate your incubator’s temperature uniformity by placing multiple thermometers at different positions inside.
This calculator covers domestic poultry species commonly incubated in artificial incubators. Wild bird egg incubation requires species-specific knowledge and, importantly, a federal and state wildlife rehabilitation permit in the United States. Under the Migratory Bird Treaty Act, it is generally illegal for unlicensed individuals to possess migratory bird eggs or birds. If you find wild bird eggs or injured birds, contact a licensed wildlife rehabilitator through your state wildlife agency or through the National Wildlife Rehabilitators Association. The incubation periods, temperature requirements, and developmental needs of wild species differ significantly from domestic poultry and require specialized knowledge beyond what this calculator provides. For domestic poultry species not listed here (emu, ostrich, rhea), additional research into species-specific protocols is needed as their requirements differ meaningfully from the species covered.
This calculator is species and timeline focused rather than equipment focused, so we do not endorse specific brands. However, the most important features to prioritize when selecting an incubator for a backyard flock operation are: forced-air circulation (far more reliable and uniform temperature than still-air models), an automatic egg turner (reduces hands-on time and improves hatch rates versus manual turning), a digital thermostat with a display that reads to one-tenth of a degree, a transparent viewing window so you can check the hatch without opening the incubator during lockdown, and a water reservoir with a visible level indicator. University extension programs including Extension Poultry publish equipment guides for small-scale producers. For small flocks of under 40 eggs per cycle, countertop forced-air incubators in the 30 to 50 egg capacity range are typically sufficient and significantly more affordable than cabinet-style commercial incubators.
Editorial Transparency and Data Sources: Incubation periods, candling schedules, lockdown timing, and temperature and humidity parameters in this calculator are sourced from Extension Poultry (Land-Grant University Network), USDA NIFA poultry production guidance, and published university extension fact sheets on artificial incubation from Penn State, University of Kentucky, and Mississippi State University Extension Service. Incubation periods are standard reference values; actual hatch timing varies based on incubator calibration, egg age, and biological variation. This tool is for educational and planning purposes only. Consult your local cooperative extension service for region-specific poultry management guidance. Waterfowl and other species regulations: consult US Fish and Wildlife Service before incubating wild or protected species. Last reviewed August 2026.