How to Breed Crested Geckos: Eggs, Incubation, and Hatchling Care

Breeding crested geckos is one of the more accessible projects in reptile keeping. Unlike many lizards, cresties don't require elaborate temperature cycling, precise photoperiod manipulation, or specialized incubation equipment. Two healthy, well-conditioned adults of appropriate weight, a suitable egg-laying site, and a few storage containers at room temperature will get you from zero to hatchlings within a season.

That said, "accessible" doesn't mean "automatic." Females that are bred too young or too thin develop egg-binding. Eggs that are too wet rot; too dry and the embryos die. Hatchlings that aren't set up correctly from day one get stressed into bad feeding behaviors that are hard to break. The details matter.

This guide covers the full process, from conditioning breeding animals through the first weeks of hatchling life.

Step 1: Conditioning Your Breeding Pair

Before pairing, both animals need to be in prime condition. For females especially, body condition at the start of breeding season determines whether the season goes smoothly or ends at a vet visit.

Female requirements:

• Minimum weight: 35–40 grams (many experienced breeders won't breed under 40g)
• Age: 18+ months
• Body condition: No visible ribs, fat tail base, clear eyes, no retained shed
• Recent vet check recommended if you haven't bred the animal before

Male requirements:

• Minimum weight: 25 grams
• Age: 12+ months
• Hemipenal bulges clearly visible (located at the base of the tail)

Conditioning protocol (6–8 weeks before pairing): Increase feeding frequency and protein content. Feed commercial MRP every other day plus live insects (dubia roaches or crickets) twice weekly. Dust insects with calcium + D3 every feeding. The goal is to build fat reserves and bone density before the metabolic demands of egg production begin.

Step 2: The Cooling Period (Optional but Recommended)

Wild crested geckos experience a cool, dry winter in New Caledonia (their native range) that acts as a hormonal reset, synchronizing the breeding season. Many captive breeders replicate this with a 6–8 week cooling period.

Cooling protocol:

• Gradually lower temperatures to 65–68°F (18–20°C) over 2 weeks
• Reduce feeding to once weekly
• Shorten photoperiod to 10 hours of light
• Maintain humidity at the lower end of normal (50–60%)
• Hold for 4–6 weeks, then gradually return to normal conditions

Cooling is not strictly required — many breeders never do it and achieve consistent results. But females that receive a cooling period often show stronger, more synchronized breeding behavior, and the clutch counts per season tend to be higher.

Step 3: Introducing the Pair

Once both animals are at target weight and you're into the warm season (typically February–March), introduce the pair.

Introduction method: Place the male in the female's enclosure — never the reverse, as introducing a female into a male's territory can trigger defensive behavior. Supervise the first several introductions.

What normal breeding behavior looks like: The male approaches and waves his tail in a slow, deliberate arc (a species-specific courtship signal). He will then attempt to bite the female's neck — this is normal and necessary, not aggression. Neck biting immobilizes the female during copulation. You may see small abrasions at the neck and the base of the tail after successful pairing; these typically heal within a week without intervention.

Pairing duration: Leave the pair together for 2–3 days. Separate them and give the female 2–3 weeks alone before re-introducing. This gives her time to recover and begin forming the first clutch. Some breeders house the pair together throughout the season; others do supervised weekly introductions. Both work; the key is monitoring the female's condition throughout.

Step 4: Setting Up the Egg-Laying Site

Approximately 30–45 days after a successful pairing, you'll notice your female becoming restless and digging in substrate. This is her searching for a suitable egg-laying site. If no suitable site exists, she will retain the eggs — which quickly leads to dystocia (egg-binding).

Lay box setup:

• Container: 6x6 inch plastic deli container or similar, with a hole cut in the lid large enough for the gecko to enter
• Medium: 50/50 mix of peat moss and coarse sand, moistened to the point where it holds its shape when squeezed but releases no free water
• Depth: At least 3 inches
• Temperature at lay site: 72–78°F

Place the lay box in the warm zone of the enclosure. Once your female starts investigating it, check it every 2–3 days. Crested geckos typically lay in the early morning hours.

Step 5: Collecting and Setting Up Eggs

When you find eggs, handle them carefully and move them to an incubation container promptly.

Critical rule: Do NOT rotate the eggs. Within the first 12–24 hours of being laid, the embryo attaches to the upper membrane of the egg. Rotating the egg after this point drowns the embryo in albumen. Mark the top of each egg with a small pencil dot immediately upon discovery.

Incubation container:

• Small lidded deli container (32 oz works well for 2 eggs)
• Medium: Vermiculite or Hatchrite, pre-moistened. For vermiculite, mix 1:1 by weight with water (1 gram water to 1 gram dry vermiculite). Hatchrite comes pre-moistened to the correct ratio.
• Make a small depression in the medium for each egg
• Place eggs in depressions, marked side up, partially buried (half the egg below surface)
• Poke 6–8 small air holes in the lid with a pin

Incubation temperature: 72–78°F (22–26°C) — room temperature in most homes during spring and summer. No heated incubator needed. If your home goes above 82°F in summer, use a wine cooler or place containers in a basement.

Monitoring: Check containers weekly. If vermiculite dries noticeably, add a few drops of water to the sides of the container — never directly on the eggs. Healthy eggs are white or slightly pink, firm, and slightly chalky in texture. Infertile eggs turn yellow and shrink within 2–3 weeks. Remove unfertilized eggs promptly to prevent mold spread.

Step 6: Candling Eggs

At 3–4 weeks, candle the eggs by holding a small flashlight directly against each egg in a dark room. A fertile egg will show a pink blush and visible blood vessels. An infertile egg appears uniformly yellow and granular throughout.

Step 7: Pre-Hatch Signs and Assisting Hatching

Starting around day 55, check eggs daily. Signs a hatch is imminent:

• The egg begins to "sweat" (beads of condensation appear on the shell)
• Slight dimpling or deflation of the egg surface
• The shell becomes slightly translucent

Hatching typically takes 12–24 hours from the first pip (the hatchling cutting through the shell with its egg tooth). Do not assist unless the hatchling has been partially emerged for more than 12 hours without progress, or if you can see the hatchling is positioned incorrectly. Premature assistance tears blood vessels that haven't retracted yet.

Step 8: Hatchling Setup

Move hatchlings to individual enclosures immediately — even at one day old, crested geckos will bite each other's toes, which is territorial behavior, not play.

Hatchling enclosure:

• 6-quart plastic tub with cross-ventilation or a 2-gallon exo-terra-style nano enclosure
• Substrate: Paper towel for the first 4 weeks (easy to monitor feces and ensure hydration), then coco fiber
• Temperature: 70–76°F (21–24°C); no basking spot needed
• Humidity: 60–80%, achieved by misting one side of the enclosure at night
• Hides: At least two — one moist, one dry
• No live plants initially (hatchlings are small enough to become trapped)

First feeding: Wait 3–5 days after hatching before offering food. The hatchling is absorbing its yolk sac during this time and does not need external nutrition. Once 5 days have passed, offer a small amount of commercial MRP (Repashy or Pangea) in a bottle cap. Refresh every 24–48 hours.

Sexing hatchlings: You cannot reliably sex crested geckos until they reach 3–5 grams. At that point, males develop visible hemipenal bulges at the tail base. Until sexed, house hatchlings separately to prevent the "male vs. male" escalation that happens faster than most keepers expect.

Female Health Through the Breeding Season

This is what most guides skip over. Producing 6–9 clutches of 2 eggs each in a single season is metabolically enormous. Each egg has a shell containing calcium that comes entirely from the female's bones if her diet doesn't provide enough.

Calcium supplementation is non-negotiable during breeding season. Dust all live insects with calcium + D3 at every feeding. Keep a small bottle cap of pure calcium powder in the enclosure at all times so the female can self-supplement as needed — they frequently do, and it suggests they know their own requirements.

Watch for these signs of calcium depletion:

• Soft, flexible jaw (metabolic bone disease)
• Tremors or twitching
• Difficulty climbing vertical surfaces
• Egg binding — the female strains visibly for more than 24 hours without laying

If a female shows any of these signs, stop breeding immediately and consult an exotic animal vet. Dystocia typically requires a calcium injection and sometimes manual manipulation or surgery. It is preventable with proper supplementation; it is expensive and risky once it occurs.

Pull females from breeding at the end of summer (late September in the Northern Hemisphere) regardless of condition. Give them a full cool-down and recovery period of 4–6 months before resuming. This cycle — breed season, recovery season — is how you maintain productive females for 15–20 years.