Crested Gecko Eggs: Breeding, Incubation, and Hatching

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Crested gecko eggs are soft shelled and oval. A female lays them in a damp, diggable spot rather than out in the open. A single female can produce several clutches in one season.

She does not need a male present for every clutch. Females store sperm for months after mating. This guide covers the whole process, from getting a female ready to breed through incubating and hatching the eggs she lays.

Female Weight and Condition Before Breeding

Breeding takes a real physical toll on a female crested gecko. Size and condition matter more than age alone. Animal Diversity Web puts female maturity at about 12 months and 30 to 35 grams, and most keepers wait until a female reaches at least 35 grams before pairing her.

Many prefer 40 to 45 grams as a safety margin. A female in poor condition faces a higher risk of dystocia, or egg binding. VCA Animal Hospitals lists low calcium, dehydration, poor muscle tone, and a missing nest site among its causes, and it can be fatal without prompt veterinary care.

Age alone is a poor guide. Growth depends heavily on diet and temperature. A female can reach breeding weight anywhere from 12 to 18 months old, sometimes later on a lean diet.

Weigh her on a gram scale rather than guessing from appearance. A small framed female can look plump at an unsafe weight. Consistent care and steady feeding get her to breeding weight on schedule.

Mating and Sperm Retention

Pairing usually happens in a neutral enclosure for a few days to two weeks. The male is then removed. This keeps the female from being harassed while she is gravid.

Crested geckos store viable sperm after a single mating. Animal Diversity Web states that a female retains sperm and may lay up to four eggs, or two clutches, before she needs to mate again. Keepers often report fertile eggs for longer than that, but two clutches is the documented figure.

This matters for planning. A keeper who separates a pair after one mating should still expect fertile eggs for at least the next two clutches. A missing male does not mean the next clutch will be infertile.

Clutch Size and Laying Frequency

A gravid crested gecko almost always lays two eggs per clutch. A single egg clutch can happen, usually early or late in a female’s breeding life. Two remains the standard number.

A healthy adult female lays a new clutch every 4 to 6 weeks, the interval Animal Diversity Web gives, across a season of 8 to 10 months. Each egg measures up to 11 by 24 millimeters and weighs 1.2 to 2.8 grams. The table below gives a rough season overview.

Individual geckos vary, so track actual lay dates rather than a fixed calendar. A female that goes far past her usual interval while swollen, weak, and off her food needs a check for egg binding. VCA describes exactly that picture, a gravid reptile that is anorectic and weak with a distended abdomen, and it is an emergency.

Setting Up a Lay Box

A gravid crested gecko needs a dedicated lay box, even in an enclosure that already has substrate. She looks for damp, diggable material rather than a drier surface layer. A deli cup or small container, 4 to 6 inches deep, works well.

Pack it with a moist mix of coconut fiber or sphagnum moss. The mix should hold its shape when squeezed but not drip water. Standing water in the lay chamber can cause eggs to mold or drown the embryos inside.

Cut an opening large enough for the female to enter and exit easily. Place the box in a cooler, more humid corner of the enclosure. General humidity control in the main tank still matters for a gravid female.

A housing setup with enough vertical space keeps her from being cornered while she searches for a lay spot. Once she starts to swell and refuses food, check the lay box daily. Most keepers then move the eggs to a separate incubator, since temperature and humidity are easier to control there.

Candling Crested Gecko Eggs

Candling crested gecko eggs means holding a bright, small light against the shell in a dark room. A phone flashlight or a dedicated egg candler both work. It works best a week or two after laying, once the shell has firmed up.

A fertile egg shows a network of fine red or pink veins spreading across the yolk. An infertile or dead egg looks like a uniform yellow mass with no visible veins. Handle eggs as little as possible during candling.

Never rotate an egg from the position it was laid in. These eggs are not turned during incubation the way bird eggs are. Rotating one can tear the internal membranes supporting the embryo.

If an egg looks clearly infertile or starts to collapse and discolor, remove it promptly. A rotting egg can spread mold to healthy eggs sitting beside it.

Incubating the Eggs

Crested gecko egg incubation does not need an elaborate heating setup. Many keepers get reliable results at stable room temperature, since these geckos come from a mild island climate rather than a hot desert. See this site’s heating and lighting page for more on that baseline.

Temperature, humidity, and airflow are the three variables that matter most, in roughly that order. Animal Diversity Web gives the full span as 60 to 150 days after laying. The split by temperature below is drawn from keeper records inside that documented range, not from a controlled study.

Aim for humidity in the 80 to 90 percent range. Keep the incubation medium damp but not soaked. A shallow, lidded container with a few small air holes is enough for most home setups.

Animal Diversity Web reports temperature dependent sex determination in this species, with warmer incubation producing more males and cooler incubation more females. It does not give the pivot temperatures, so keepers choose a temperature for timing and hatch health rather than to set the sex ratio. Check the container every few days for mold or condensation.

Watch for eggs that dimple inward, which can signal drying out. A healthy egg usually swells slightly as it absorbs moisture and nears hatching. A firm, slightly larger egg late in incubation is a good sign.

Unfertilized Crested Gecko Eggs

Females can and do lay crested gecko unfertilized eggs with no male ever present. Egg production is a normal cycle, independent of mating. An unfertilized egg usually looks slightly smaller, more yellow, or chalky compared to a fertile one.

Candling shows no vein network at any point during incubation on an infertile egg. These eggs will not develop. Remove them once identified so they do not encourage mold near fertile eggs nearby.

A solitary female that regularly lays infertile clutches is not sick. This is expected biology, similar to a chicken laying unfertilized eggs. It will not stop just because no male is present.

If a solo female lays often and starts losing condition, the fix is diet and calcium, not a male. Introducing a male will not change how often she cycles.

Crested Gecko Hatchlings

A crested gecko hatchling emerges from an egg that weighed only 1.2 to 2.8 grams, so it weighs less than that itself. It is small enough to sit on a fingertip. Size varies some by incubation length and clutch.

Hatchlings usually pip a small slit in the shell first. They then rest for several hours to a full day before fully emerging. Do not open a slit egg by hand.

Move each hatchling to its own small enclosure once it has fully emerged and its skin has dried. House hatchlings alone or in small, same weight groups only. A size mismatch can let one outcompete or injure another.

Offer a complete powdered diet and fresh water within the first day or two. Watch early behavior for normal feeding and shedding. Expect the first shed within about a week of hatching.

Female Recovery, Rest Periods, and Calcium

Continuous laying draws heavily on a female’s calcium reserves. Females breed for 8 to 10 months of the year and then stop, and breeders copy that with a rest after 6 to 10 clutches. This means cooling the enclosure slightly and separating her from any male for several months.

A female given no break can develop calcium deficiency, weak bones, or repeated egg binding. Each of these shortens her breeding life. Left unmanaged, they can threaten her health outright.

Calcium supplementation matters year round for a breeding female, not only around lay dates. Aurora Animal Hospital dusts every insect with a phosphorus free calcium powder, such as Zoo Med Repti Calcium without D3, and recommends low level UVB for breeding females to prevent metabolic bone disease. Pair that with a complete powdered diet fed on schedule.

A female that looks thin, wobbly, or has a soft lower jaw needs a veterinary check, not just more supplements. This ties into general health monitoring. Body shape covered on the anatomy page can help a keeper spot early weight loss.

Frequently Asked Questions

How many eggs does a crested gecko lay at once?

Almost always two eggs per clutch. A single egg clutch can happen, especially from a very young or older female. A pair is the normal pattern through a healthy breeding season.

How long do crested gecko eggs take to hatch?

Incubation runs from about 60 days near 76 to 78 degrees Fahrenheit up to 150 days near 68 to 70 degrees. Most home setups land in the 75 to 100 day range.

Can a female crested gecko lay eggs without a male?

Yes. Females cycle and produce eggs on their own, whether or not a male is present. Unfertilized clutches from a solo female are normal, not a sign of illness.

How do I know if a crested gecko egg is fertile?

Candle the egg with a bright light in a dark room one to two weeks after laying. A visible vein network across the yolk means a developing embryo. A plain yellow interior with no veins usually means the egg is infertile.

What size should a female be before breeding her?

Animal Diversity Web puts maturity at about 12 months and 30 to 35 grams. Most keepers wait until she reaches at least 35 grams, with 40 to 45 grams preferred, since a female in poor condition faces a higher risk of egg binding.

How big is a crested gecko baby at hatching?

A newly hatched crested gecko baby weighs less than the 1.2 to 2.8 gram egg it came from. Its first shed usually comes within about a week. Move it to its own enclosure once fully emerged and dried off.