Leopard gecko eggs need stable warmth, the right moisture, good airflow, and careful handling from the moment you find them until they hatch. This guide shows you how to incubate leopard gecko eggs step by step: collecting the eggs, setting up the incubation container, choosing a temperature, managing humidity, candling, and fixing problems. It also covers the variable many guides skip: how incubation temperature affects whether you get mostly males or mostly females.
Quick Answer: How to Incubate Leopard Gecko Eggs
Incubate leopard gecko eggs at 80 to 90°F (27 to 32°C) with 70 to 90% humidity inside the container, in moistened vermiculite or perlite, with the top of each egg kept facing up. Hatching takes 35 to 89 days depending on temperature. Cooler incubation (about 80 to 82°F) produces mostly females, around 90°F produces mostly males, and about 87°F often gives a mixed clutch, though no temperature guarantees the ratio.
| Leopard gecko eggs at a glance | Typical value |
|---|---|
| Eggs per clutch | 1 to 2 (never more than 2) |
| Clutches per breeding season | About 3 to 8, laid roughly 2 to 4 weeks apart |
| Incubation temperature | 80 to 90°F (27 to 32°C) |
| Container humidity | 70 to 90% (around 80% is common) |
| Incubation time | 35 to 89 days, depending on temperature |
| Substrate | Vermiculite or perlite, damp but not dripping |
| Egg orientation | Keep the marked top facing up; never rotate |
| Start candling | Around 10 to 14 days |
| Sex of hatchlings | Set by incubation temperature |
On this page:
- What You Will Need
- What Leopard Gecko Eggs Look Like
- Leopard Gecko Egg Incubation Setup
- Choosing a Reptile Egg Incubator
- Step 1: Collect the Eggs Correctly
- Step 2: Prepare the Container and Substrate
- Step 3: Set the Incubation Temperature
- Step 4: Maintain Moisture and Humidity
- Step 5: Candle the Eggs
- Step 6: What to Expect Near Hatch Day
- How Long Do Leopard Gecko Eggs Take to Hatch?
- Incubating Without an Incubator
- Common Incubation Problems and Fixes
- FAQs
- Sources
What You Will Need
- A dedicated reptile egg incubator that holds a steady, low-swing temperature (far better than repurposing a household appliance)
- An accurate thermometer and hygrometer placed at egg level, not just wherever the incubator's built-in sensor sits
- A hatching container with a lid, such as a deli cup or small plastic tub
- Incubation substrate: vermiculite, perlite, or a blend of the two
- An egg candler to check fertility and development without opening the eggs
- A soft pencil or marker to mark the top of each egg
- Distilled or spring water, since tap water minerals can build up in the substrate over weeks
What Do Leopard Gecko Eggs Look Like?
Leopard gecko eggs are white or cream, oval, and leathery rather than hard-shelled, about an inch (2.5 cm) long. A female lays one or two eggs per clutch, usually two, and she typically buries them in a moist spot such as a lay box. Fresh eggs can feel slightly soft or sticky, then firm up as they settle into the substrate.
- Healthy eggs are plump, white to cream, and stay firm. When candled after about 10 to 14 days, fertile eggs show reddish veins.
- Warning signs are a collapsed, discolored, moldy, or yellowing shell, or an egg that stays clear with no veins after several weeks.
- A small dent is not always a problem. See the problems section before discarding an egg.
Leopard Gecko Egg Incubation Setup
Before the steps, it helps to see how the pieces fit together. The incubator provides a stable outer temperature. Inside it sits your hatching container, with a lid. Inside the container is the substrate, which holds the eggs at the right moisture level. A temperature probe at egg height tells you what the eggs actually experience, and a hygrometer tracks humidity inside the container rather than the room around it.
That layered setup (incubator, container, substrate, eggs, probe) lets you control temperature and moisture independently of the weather or your house.
Choosing a Reptile Egg Incubator
For leopard gecko eggs, the most important feature is a thermostat that holds temperature within about a degree. A short feature list matters less than stability. Look for:
- Thermostat control: a digital thermostat that holds temperature steady is the single spec worth prioritizing.
- Stability over weeks: consistent performance for the full incubation period, not just a fast warm-up.
- Capacity that matches your setup: a small tabletop unit is plenty for a handful of clutches, while cabinet units suit breeding programs.
- A digital display and, ideally, humidity monitoring so you can check conditions at a glance.
- Visibility, such as a clear door or window, so you can check eggs without disturbing the temperature.
- A backup thermometer and hygrometer at egg level, because even a good internal sensor can drift.
A smaller, well-insulated reptile incubator is usually a better fit for leopard gecko eggs than a large poultry cabinet, since it is easier to hold a precise temperature in a small space. Options include the HovaBator reptile incubator kit, the Little Giant reptile incubator kit, and the HovaBator Genesis 1588, whose thermostat adjusts down to 80°F. Compare more in our best reptile egg incubator guide and the reptile egg incubator buyer's guide. Prefer to build your own? See the IncuKit for reptiles.
Step 1: Collect the Eggs Correctly
Leopard geckos typically lay two soft, leathery eggs per clutch, and a healthy female can produce several clutches in a season, roughly two to four weeks apart. When you find eggs, move slowly.
Mark the top of each egg before you move it, and keep that side up for the whole incubation. Rotating an egg after the embryo has attached to the membrane can damage the embryo. Use a pencil to draw a small dot or "T" on the top exactly as the egg rests in the lay box. Then lift it gently with your fingers or a soft spoon, keeping the marked side up. Do not roll, tilt, or rotate it.
If an egg looks collapsed, discolored, or moldy right away, it may be infertile, but do not discard it immediately. Some soft or dented eggs firm up and hatch once they reach stable humidity, so give them a few days in the incubator first.
Step 2: Prepare the Container and Substrate
Fill a deli cup or tub about halfway with vermiculite or perlite, then add water until the substrate holds together in a loose ball when squeezed without dripping. This squeeze test is more reliable for beginners than a water-to-substrate ratio by weight, since bag density varies between brands.
Nestle each egg into the substrate so it is buried about halfway, marked side up, with at least half an inch between eggs. If one egg goes bad, spacing limits the risk to that egg instead of the whole clutch.
Give the container real ventilation. A few small holes near the top, above the substrate line, allow gas exchange without drying the medium. Good airflow also reduces the risk of excess moisture between checks.
Step 3: Set the Incubation Temperature
Incubation temperature controls both how fast leopard gecko eggs develop and the sex of the hatchlings. Leopard geckos have temperature-dependent sex determination (TSD), which most other pet reptiles and all birds do not.
The classic study by Flores, Tousignant and Crews (1994) found that eggs incubated at 26°C (about 79°F) produced 100% females, 30°C (86°F) about 70% females, 32.5°C (about 90.5°F) about 75% males, and 34°C (about 93°F) about 95% females. In other words, males come from intermediate temperatures, and very high temperatures swing the ratio back toward females. A 2026 study from Tokyo University of Science also traced the gene-expression changes that follow cool versus warm incubation, which helps explain how temperature steers development.
| Incubation temperature | Commonly reported incubation time | Expected sex bias |
|---|---|---|
| 78 to 82°F (26 to 28°C) | 55 to 89 days | Female-biased (lab: 100% female at 26°C) |
| 85 to 87°F (29 to 31°C) | 45 to 60 days | Mixed; breeders often aim for about 87°F for a more even split, but lab data show about 70% female at 86°F |
| 88 to 90°F (31 to 32°C) | 35 to 45 days | Male-biased (lab: about 75% male at 90.5°F) |
| Above 92°F (33°C) | Fastest, but risky | Can swing back toward females; higher risk of deformities or death |
| Below 77°F (25°C) | Very slow or stalled | Poor viability |
Even so, temperature is a strong bias rather than a guarantee, and eggs from the same clutch can vary. Many breeders use 85 to 87°F as a working default because it keeps incubation time reasonable and stays clear of the extremes where problems increase.
Important: do not raise the temperature just to force a faster hatch. Warmer incubation shifts the ratio toward males and, past about 90 to 92°F, raises the risk of developmental problems and dead-in-shell eggs. Treat the top of the range as a ceiling, not a shortcut.
Research has also linked incubation temperature to some adult behavior in leopard geckos, including more aggression in animals from male-biased temperatures, which is where the hobby term "hot female" comes from. Temperature is not the only factor shaping behavior, so treat it as a detail, not a rule about any individual gecko.
Whatever number you choose, stability matters more than hitting an exact degree. Fluctuating temperature is a common and preventable cause of failed clutches. Check your readings with an independent probe such as the IncuTherm Plus Hatch Monitor, and see our egg incubator temperature chart for other species.
Step 4: Maintain Moisture and Humidity
Leopard gecko eggs are soft-shelled, so they gain and lose moisture through the shell throughout incubation. Two related things need managing, and mixing them up is a common beginner mistake.
Substrate moisture is the moisture in direct contact with the egg, set by how wet the vermiculite or perlite is. Use the squeeze test from Step 2: it should hold together without dripping.
Container humidity is the air moisture inside the container, which a hygrometer measures. Aim for 70 to 90%, with around 80% common. Humidity follows substrate moisture and ventilation, so if the reading is low, re-moisten the substrate slightly instead of misting the air.
Check the substrate every few days. If it feels dry or an egg looks dimpled, mist lightly with room-temperature distilled water around the substrate, never directly on the egg. If the substrate is soggy or you see condensation beading inside, increase ventilation for a day or two, or leave the lid slightly ajar until it dries back to the right range. A translucent or "sweating" patch on a shell can signal too much moisture, so ease off if you see it.
A digital hygrometer inside the container gives you a real reading to work from instead of a guess. For general humidity concepts, see our humidity control and hatch rates guide.
Step 5: Candle the Eggs
Start candling around 10 to 14 days in, and candle only once every week or two. Hold the egg candler gently against the shell in a dark room. A fertile, developing egg shows a network of reddish veins and eventually an embryo shape. An infertile or non-viable egg stays clear or uniformly yellow with no vein structure.
Leopard gecko eggs do not benefit from daily handling, and extra handling raises the risk of rotating an egg out of its original orientation. Once you can clearly see a well-developed embryo and movement, there is little benefit to continued candling. For what to look for at each stage, see our reptile egg candling guide.
Step 6: What to Expect Near Hatch Day
In the final days, eggs often dimple or develop small dents. This can look alarming but is usually normal as the hatchling absorbs the last of its yolk sac and prepares to pip.
You may see a small slit or star-shaped crack in the shell a day or more before the hatchling emerges. This is normal. Do not help the gecko out of the egg or peel back the shell, even if it seems to take a long time. Hatchlings pulled out too early often have unabsorbed yolk sacs, which is a serious health risk.
Once a baby has fully hatched, leave it in the incubation container for several hours, or overnight, so it can rest and absorb any remaining yolk before you move it to its own enclosure.
How Long Do Leopard Gecko Eggs Take to Hatch?
Leopard gecko eggs take 35 to 89 days to hatch, and incubation temperature is the main factor. At about 88 to 90°F, hatching often happens in 35 to 45 days. At about 85 to 87°F, expect roughly 45 to 60 days. At the cooler end, around 78 to 82°F, it can stretch past 80 days.
Eggs from the same clutch incubated together usually hatch within a few days of each other, though one or two stragglers are common. This guide covers leopard geckos only. Other gecko species have different incubation times and temperatures, so check our reptile egg incubation by species guide, and for another popular reptile, see how to incubate bearded dragon eggs.
Incubating Leopard Gecko Eggs Without an Incubator
You can incubate leopard gecko eggs without a dedicated incubator, but it is harder to keep the temperature steady. People use an insulated box or a container in a room that stays warm and stable, with a thermometer at egg level. The trade-off is risk: temperature swings are one of the most common causes of failed clutches, and you have little control over the sex ratio.
If you try it, keep the eggs away from drafts and direct sun, check the temperature several times a day, and be ready to move to a thermostat-controlled reptile incubator if readings drift. A basic thermostat-controlled unit removes most of that risk for a relatively small cost.
Common Incubation Problems and Fixes
Egg looks dented or collapsed early in incubation: This is usually a humidity issue. Increase moisture slightly and monitor for a few days before assuming the egg is dead. A mild dent close to hatch day is often normal as the hatchling absorbs its yolk.
Egg develops mold on the outside: Light surface mold can sometimes be wiped away gently with a cotton swab, but widespread mold usually means the substrate is too wet or the egg has died. Isolate it from healthy eggs immediately.
Egg turns yellow and shrivels: This typically means the egg is no longer viable. Remove it so it does not affect neighboring eggs.
No visible development after three weeks of candling: The egg is likely infertile. This is common, especially in a female's first clutches of the season, and is not a sign you are doing anything wrong.
Eggs hatching unusually late or not at all: Check the real temperature at egg level with a separate thermometer. Built-in displays and low-cost incubators can read a few degrees off, a common hidden cause of stalled clutches. Give eggs extra time before assuming failure, since cooler incubation can run past 80 days.
One egg hatches days before the other: This is common and not usually a concern. Leave the unhatched egg in place and give it the full expected range for your temperature.
Egg appears to leak fluid: This usually means the shell membrane has ruptured and the egg is unlikely to survive. Isolate it to protect the rest of the clutch.
Should I raise humidity before hatching? Some breeders raise humidity slightly in the final week to soften the shell for pipping. It is not required if humidity has been steady, but it does not hurt as long as you avoid saturating the substrate.
For more, see our reptile egg incubation troubleshooting guide.
FAQs (People Also Ask)
Q: How long do leopard gecko eggs take to hatch?
Ans: 35 to 89 days, depending on temperature. About 88 to 90°F usually hatches in 35 to 45 days, about 85 to 87°F in roughly 45 to 60 days, and 78 to 82°F can take well over 80 days.
Q: What do leopard gecko eggs look like?
Ans: They are white or cream, oval, and leathery, about an inch long. Healthy eggs stay plump and firm. A fertile egg shows reddish veins when candled after about 10 to 14 days, while a collapsed, yellowing, or moldy egg is a warning sign.
Q: How many eggs does a leopard gecko lay?
Ans: One or two eggs per clutch, usually two, and never more than two. A female can lay several clutches per breeding season, roughly two to four weeks apart.
Q: What temperature should I incubate leopard gecko eggs at?
Ans: Between 80 and 90°F (27 to 32°C). About 80 to 82°F tends to produce females, around 87°F often gives a mix, and about 90°F tends to produce males. Temperature biases the sex ratio but does not guarantee it.
Q: What humidity do leopard gecko eggs need?
Ans: Aim for 70 to 90% humidity inside the container, with around 80% common. Keep the substrate damp enough to hold a loose ball when squeezed but not dripping.
Q: Do leopard gecko eggs need to be turned like chicken eggs?
Ans: No. Unlike bird eggs, leopard gecko eggs should never be rotated once the embryo has attached to the membrane. Keep the marked top side facing up for the entire incubation.
Q: Can I incubate leopard gecko eggs without an incubator?
Ans: Yes, but temperature swings are much harder to control, and inconsistent temperature is one of the most common causes of failed clutches. A thermostat-controlled reptile incubator removes most of that risk.
Q: What temperature makes the most female leopard geckos?
Ans: Cooler temperatures in the 78 to 82°F range produce mostly females, though incubation takes much longer. In lab studies, 26°C (about 79°F) produced 100% females.
Q: What temperature makes male leopard geckos?
Ans: Temperatures around 88 to 90°F produce mostly males. A classic study found about 75% males at 32.5°C (about 90.5°F), and very high temperatures can swing back toward females.
Q: When should I start candling leopard gecko eggs?
Ans: Around 10 to 14 days into incubation, and then only once every week or two. Fertile eggs show reddish veins, while infertile eggs stay clear or yellow.
Q: Why did my leopard gecko eggs not hatch?
Ans: The most common causes are infertility, temperature fluctuation, incorrect humidity, or an egg being flipped from its original orientation during collection. Candling early helps separate infertile eggs from eggs that developed and then stalled.
Q: Is it normal for only one egg in a clutch to hatch?
Ans: Yes. It is common for one egg in a two-egg clutch to be infertile or fail partway through while the other hatches normally. This does not necessarily mean there is a problem with your setup.
Q: Should I help a leopard gecko hatch?
Ans: No. Do not peel back the shell or pull the hatchling out, even if it takes a long time. Early removal often leaves an unabsorbed yolk sac, which is a serious health risk.
Give Your Clutch the Best Odds
Successful leopard gecko egg incubation comes down to controlling a few variables consistently, not perfectly. A dedicated reptile incubator, an accurate thermometer and hygrometer at egg level, and some patience will take you further than any amount of guesswork.
Related Incubation Resources
- Complete Guide to Reptile Egg Incubation, for the basics across species
- Reptile Incubation FAQ, for quick answers to common questions
- Reptile Egg Incubator Buyers Guide, to choose an incubator for how many clutches you handle
- Egg Candlers, for checking development without opening the eggs
Sources
- Flores D., Tousignant A., Crews D. (1994). Incubation temperature affects the behavior of adult leopard geckos (Eublepharis macularius). Physiology & Behavior, 55(6), 1067-1072.
- Tokyo University of Science (2026). New study clarifies how temperature shapes sex development in leopard gecko.
- Leopard Gecko overview, ScienceDirect Topics, on temperature-dependent sex determination.