Crested Gecko Egg Laying and Incubation: A Complete Keeper's Guide
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Crested geckos are relatively straightforward to breed in captivity, but the egg-laying and incubation phase is where many first-time breeders run into trouble. Eggs get damaged during collection, humidity goes wrong, or hatchlings arrive but fail to thrive. This guide walks you through every stage with practical advice drawn from real keeper experience.
Photo by Tatev Ayvazyan on Unsplash
Understanding the Crested Gecko Breeding Cycle
Crested geckos in the wild follow a seasonal breeding cycle tied to temperature fluctuations. In captivity, you can mimic this by cooling your enclosure to around 68-72°F for 2-3 months during winter, then returning to normal temperatures (74-78°F) in spring. This cooling period is not strictly required, but it significantly improves breeding success and clutch consistency.
A healthy female crested gecko can produce a clutch of two eggs roughly every 30-45 days throughout the breeding season. Over a full season, one female may lay 6-9 clutches. This is metabolically demanding, so nutritional support is not optional.
Pre-Lay Nutrition Is Critical
Female geckos pull calcium directly from their bones to shell eggs. If dietary calcium is inadequate, you risk metabolic bone disease and egg-binding. Dust feeder insects with a calcium-with-D3 supplement 2-3 times per week during breeding season. Also keep a small dish of pure calcium carbonate powder in the enclosure at all times so she can self-regulate. Many experienced breeders increase Repashy or Pangea meal replacement paste portions during this period as well.
Signs Your Female Is Ready to Lay
Watch for these behavioral cues:
- Restlessness and frequent digging around the enclosure base
- Visible egg bulges on either side of the abdomen when viewed from below (hold her gently against a light source)
- Reduced appetite in the final week before laying
- Spending more time in or near the lay box
The lay box needs to be in place before she shows signs of being gravid. A female that cannot find a suitable lay site may retain eggs, which can become life-threatening.
Setting Up the Lay Box
Use a plastic container with a secure lid, roughly 6x6 inches. Cut an entry hole in the lid or side large enough for her to enter comfortably. Fill it with 3-4 inches of moistened coconut fiber or a 50/50 mix of coconut fiber and organic topsoil. The substrate should hold its shape when squeezed but not drip water.
Place the lay box in a quiet, lower section of the enclosure. Females prefer to lay in darkness, so an opaque container works better than a clear one.
Collecting and Handling Eggs
Check the lay box every 2-3 days once your female is visibly gravid. Crested gecko eggs are soft-shelled and porous, which means they are far more delicate than hard-shelled reptile eggs.
The most important rule: Do not rotate the eggs. As soon as the embryo attaches to the shell interior, flipping the egg will drown it. When you find eggs in the lay box, use a soft marker or white-out pen to place a small dot on the top of each egg before moving it. This lets you maintain orientation during transfer.
Gently remove each egg using your fingers or a soft spoon. Examine them for obvious defects: healthy eggs are white or off-white, slightly firm, and uniform in shape. Eggs that are yellow, collapsed, or have visible veining patterns without development are likely infertile.
One Insight Keepers Often Miss
Unlike many reptile eggs, crested gecko eggs can actually tolerate being moved and even briefly jostled in the first 12-24 hours after laying, before the embryo has fully attached. After that window, orientation is fixed and must be maintained. If you check your lay box daily, you have some flexibility. If you only check every few days, always assume the egg has been in place long enough to require careful orientation-preserving handling.
Incubation Basics
Crested gecko eggs do not need high temperatures to incubate. This is one of their most forgiving traits for captive breeding. Room temperature incubation works well in most homes.
Target incubation temperature: 68-74°F Humidity: 80-90% inside the incubation container Incubation period: 60-120+ days depending on temperature
Cooler temperatures extend incubation time but often improve hatch rates and result in larger, healthier hatchlings. Eggs incubated consistently above 80°F tend to have higher failure rates and produce weaker hatchlings.
Choosing an Incubation Container
Use a small deli cup or shoebox-sized plastic container with a tight-fitting lid. Add 1-2 inches of your chosen substrate (coconut fiber, perlite, or Hatch-Rite are all effective). Nestle the eggs halfway into the substrate with the marked dot facing up. Leave a small air gap between eggs.
Do not seal the container completely. Make 2-3 small pinholes in the lid to allow minimal air exchange without rapid moisture loss. Check the substrate every 1-2 weeks and mist lightly if it is drying out.
Exo Terra Incubation Substrate works well for maintaining consistent humidity without becoming waterlogged.
To Use a Mechanical Incubator or Not?
For crested geckos, a dedicated reptile incubator is rarely necessary unless your home temperatures fluctuate dramatically. If your home stays between 68-76°F year-round, a room-temperature setup is sufficient and produces excellent results. If you live somewhere with hot summers, a mini-fridge-based incubator set to 72°F offers more consistent control.
Zoo Med ReptiTemp 500R Incubator is a reliable mid-range option if you decide to invest in one.
Monitoring Development
Candle the eggs (shine a small flashlight through them in a dark room) at 2-3 weeks of incubation. Fertile eggs will show a pink or red network of veins and possibly a dark spot (the embryo). Infertile or dead eggs will appear uniformly yellow or begin to mold.
Remove moldy eggs immediately to protect neighboring eggs. A single moldy egg can spread Penicillium rapidly through a clutch.
Hatching and What to Expect
Hatchlings will pip (break through the shell) and may remain partially inside for 12-48 hours while absorbing the yolk sac. Do not assist them unless the hatchling is clearly exhausted and the yolk sac is fully absorbed. Premature assistance risks tearing blood vessels.
Transfer hatchlings to a small enclosure (a 6-quart shoebox container works well) once they have fully emerged and the egg sac is absorbed. Offer their first meal at 5-7 days old. First feeding is typically Pangea or Repashy meal replacement paste placed on the enclosure wall, supplemented by small feeder insects once they are feeding consistently.
Pangea Fruit Mix Complete Crested Gecko Food is an excellent first food and remains a staple throughout their lives.
Common Mistakes and How to Avoid Them
- Incubating too warm: Temperatures above 78°F consistently degrade hatch rates and produce developmental abnormalities. Stick to the low-to-mid 70s.
- Overwatering the substrate: Eggs that sit in saturated substrate will rot. The substrate should feel barely damp, not wet.
- Neglecting the female post-lay: A female who has just produced a clutch needs extra calcium and food for 1-2 weeks before she starts developing the next clutch.
- Checking too often: Resist the urge to open the incubation container more than once every 7-10 days. Every opening brings in dry air and drops humidity.
The Pangea Reptile crested gecko breeding guide covers egg care and incubation setup in practical detail.
Frequently Asked Questions
How many eggs do crested geckos lay at a time? Crested geckos almost always lay exactly two eggs per clutch. Occasionally a female will lay a single egg, usually because one was infertile or reabsorbed. Clutches of more than two eggs are extremely rare.
Can I incubate crested gecko eggs at room temperature? Yes, and most experienced keepers do. As long as your room stays between 68-76°F, a sealed plastic container with moistened substrate is all you need. Mechanical incubators are helpful if your home gets warm in summer.
How do I know if a crested gecko egg is fertile? Candling at 2-3 weeks will show a network of blood vessels and a developing embryo in fertile eggs. Infertile eggs appear uniformly translucent or yellow and do not develop visible vasculature.
What do I do if an egg gets moldy? Remove it immediately and discard it. Wipe the surrounding substrate area lightly with a paper towel and check remaining eggs for early signs of mold. A small amount of surface mold on an otherwise healthy egg can sometimes be gently removed with a damp cotton swab, but the success rate is low.
How long does crested gecko egg incubation take? Typically 60-120 days at room temperature. Eggs incubated on the cooler end of the range (68-70°F) often take closer to 120 days but tend to produce larger, more vigorous hatchlings. Eggs at 74-76°F typically hatch in 60-80 days. —
Related Reading
Before you breed, make sure you can accurately sex your animals. See our Male or Female guide for reliable identification methods.