A comprehensive reference chart covering 35+ reptile species. Find the correct incubation temperature, humidity level, average hatch time, and clutch size for snakes, lizards, geckos, tortoises, and turtles.
| Species | Temp Range (°F) | Temp Range (°C) | Humidity | Incubation Time | Avg Clutch Size | TSD | Notes |
|---|---|---|---|---|---|---|---|
Ball Python Python regius |
88–90°F | 31–32°C | 55–65 days | 4–10 eggs | No | High humidity critical. Clutch coiling by female is common. Use deli cups in incubator. | |
Corn Snake Pantherophis guttatus |
78–82°F | 25–28°C | 58–65 days | 10–30 eggs | No | Very forgiving. Excellent first incubation project. Room temp incubation possible in warm climates. | |
Kingsnake / Milk Snake Lampropeltis spp. |
78–82°F | 25–28°C | 55–75 days | 5–17 eggs | No | Cooler end of range works well. Stable temp more important than exact number. | |
Western Hognose Heterodon nasicus |
82–86°F | 28–30°C | 55–65 days | 8–23 eggs | No | Drier incubation than most colubrids. Medium should be slightly less moist. | |
Carpet Python Morelia spilota |
88–90°F | 31–32°C | 45–55 days | 10–25 eggs | No | Female coils eggs. Can maternal-incubate or pull to incubator. Shorter incubation than ball pythons. | |
Green Tree Python Morelia viridis |
88–90°F | 31–32°C | 47–55 days | 8–25 eggs | No | Female coils. Many breeders allow maternal incubation. Advanced species. | |
Rat Snake Pantherophis / Elaphe spp. |
80–84°F | 26–29°C | 60–75 days | 6–20 eggs | No | Similar care to corn snakes. Robust species, forgiving of minor humidity fluctuations. | |
Blood / Short-tailed Python Python brongersmai / curtus |
88–90°F | 31–32°C | 60–75 days | 10–20 eggs | No | Very high humidity required. Tropical forest species. Longer incubation time than ball pythons. | |
Burmese Python Python bivittatus |
88–90°F | 31–32°C | 60–70 days | 30–100 eggs | No | Massive clutches. Female coils eggs; maternal incubation common. Advanced species — large enclosures required. | |
Gopher / Pine Snake Pituophis melanoleucus |
78–84°F | 25–29°C | 55–75 days | 3–24 eggs | No | Large eggs. Tolerant of a wide temperature range. Cooler incubation acceptable. |
| Species | Temp Range (°F) | Temp Range (°C) | Humidity | Incubation Time | Avg Clutch Size | TSD | Notes |
|---|---|---|---|---|---|---|---|
Bearded Dragon Pogona vitticeps |
84–86°F | 29–30°C | 55–75 days | 15–35 eggs | ⚠️ Partial | Not fully TSD — above 90°F causes chromosomal sex reversal (more females). Keep below 90°F. | |
Green Iguana Iguana iguana |
85–88°F | 29–31°C | 65–90 days | 20–70 eggs | ⚠️ TSD | Large clutches. High humidity essential. Eggs must remain in position they were laid. | |
Veiled Chameleon Chamaeleo calyptratus |
68–72°F | 20–22°C | 150–200 days | 20–85 eggs | No | Unusually long incubation at cool temps. Do NOT incubate warm. Diapause period is normal. | |
Panther Chameleon Furcifer pardalis |
72–76°F | 22–24°C | 180–240 days | 10–46 eggs | No | Very long incubation. Cool, stable temperatures critical. One of the longest of any commonly kept reptile. | |
Carpet Chameleon Furcifer lateralis |
68–70°F | 20–21°C | 150–200 days | 5–25 eggs | No | Without diapause. There are also many people succesfully hatching with a diapause. | |
Uromastyx Uromastyx spp. |
84–90°F | 29–32°C | 70–90 days | 4–20 eggs | ⚠️ TSD | Unusually dry incubation — these are extreme desert animals. Do NOT use wet substrate. Dry vermiculite only. | |
Chinese Water Dragon Physignathus cocincinus |
84–88°F | 29–31°C | 60–75 days | 8–14 eggs | ⚠️ TSD | Tropical species. High humidity required. Similar incubation to bearded dragon but more moisture needed. | |
Savannah Monitor Varanus exanthematicus |
84–88°F | 29–31°C | 150–180 days | 10–50 eggs | No | Very long incubation. Termite mound nesting in wild. Large clutches from large females. | |
Ackie Monitor Varanus acanthurus |
84–90°F | 29–32°C | 150–165 days | 4–15 eggs | No | Incubate in deep humid hide. Eggs often laid deep in substrate. Australian desert species. | |
Rankin's Dragon Pogona henrylawsoni |
84–86°F | 29–30°C | 55–70 days | 8–20 eggs | ⚠️ Partial | Similar to bearded dragon. Smaller species. Can hybridize with bearded dragon — avoid housing together. |
| Species | Temp Range (°F) | Temp Range (°C) | Humidity | Incubation Time | Avg Clutch Size | TSD | Notes |
|---|---|---|---|---|---|---|---|
Leopard Gecko Eublepharis macularius |
80–88°F | 26–31°C | 40–60 days | 2 eggs per clutch | ⚠️ TSD | 80–84°F = mostly female, 85–87°F = mixed, 88–90°F = mostly male. Lays multiple clutches per season. | |
Crested Gecko Correlophus ciliatus |
72–78°F | 22–26°C | 60–90 days | 2 eggs per clutch | No | Cool incubation only — above 80°F risks developmental issues. Very forgiving species. Lays every 4–6 weeks. | |
Gargoyle Gecko Rhacodactylus auriculatus |
72–78°F | 22–26°C | 60–90 days | 2 eggs per clutch | No | Very similar to crested gecko. Cool temperatures essential. Robust species. | |
Chahoua Gecko Mniarogekko chahoua |
72–76°F | 22–24°C | 60–90 days | 2 eggs per clutch | No | New Caledonian. Keep on the cooler end. Rare — breeding records are limited. Similar to crested gecko. | |
African Fat-tailed Gecko Hemitheconyx caudicinctus |
82–86°F | 28–30°C | 55–75 days | 2 eggs per clutch | ⚠️ TSD | Similar to leopard gecko. More humidity required. Needs slightly more moisture in substrate. | |
Tokay Gecko Gekko gecko |
82–88°F | 28–31°C | 90–120 days | 2 eggs (hard-shelled) | No | Hard-shelled eggs — glued to surfaces. Do not forcibly remove. Long incubation. Tropical high-humidity species. | |
Day Gecko (Giant) Phelsuma grandis |
82–86°F | 28–30°C | 50–70 days | 2 eggs (hard-shelled) | ⚠️ TSD | Hard-shelled eggs glued to cork, wood, etc. Do not remove. High tropical humidity required. | |
Chinese Cave Gecko Goniurosaurus spp. |
72–78°F | 22–26°C | 60–90 days | 2 eggs per clutch | ⚠️ TSD | Cave-dwelling species. Cooler temperatures. Similar incubation to leopard gecko but slightly cooler. |
| Species | Temp Range (°F) | Temp Range (°C) | Humidity | Incubation Time | Avg Clutch Size | TSD | Notes |
|---|---|---|---|---|---|---|---|
Russian / Horsfield's Tortoise Agrionemys horsfieldii |
82–86°F | 28–30°C | 60–90 days | 2–5 eggs | ⚠️ TSD | Higher temp = more females. Very high humidity at top of egg container but no direct moisture on eggs. | |
Hermann's Tortoise Testudo hermanni |
82–86°F | 28–30°C | 60–90 days | 2–12 eggs | ⚠️ TSD | Very common European tortoise. High ambient humidity but eggs elevated above any standing water. | |
Greek / Spur-thighed Tortoise Testudo graeca |
82–86°F | 28–30°C | 60–90 days | 2–12 eggs | ⚠️ TSD | Similar to Hermann's. Multiple subspecies with slightly different requirements. Research your specific locality. | |
Leopard Tortoise Stigmochelys pardalis |
86–88°F | 30–31°C | 130–200 days | 5–30 eggs | ⚠️ TSD | Very long incubation. African savannah species. Dry incubation method works well. Large, domed eggs. | |
Red-footed Tortoise Chelonoidis carbonarius |
84–88°F | 29–31°C | 110–175 days | 2–15 eggs | ⚠️ TSD | Tropical forest species. Higher humidity than Mediterranean tortoises. Long incubation common. | |
Yellow-footed Tortoise Chelonoidis denticulatus |
84–88°F | 29–31°C | 120–180 days | 3–15 eggs | ⚠️ TSD | Similar to red-footed. Amazon forest species. High humidity environment throughout incubation. | |
Sulcata / African Spurred Tortoise Centrochelys sulcata |
86–90°F | 30–32°C | 90–200 days | 15–40 eggs | ⚠️ TSD | Third largest tortoise. Very wide incubation range in the wild. Large clutches. Sahara desert origin = drier incubation. | |
Indian Star Tortoise Geochelone elegans |
84–88°F | 29–31°C | 90–180 days | 3–10 eggs | ⚠️ TSD | Wide incubation time range. Monsoon climate in wild. Protected species — captive breeding records important. |
| Species | Temp Range (°F) | Temp Range (°C) | Humidity | Incubation Time | Avg Clutch Size | TSD | Notes |
|---|---|---|---|---|---|---|---|
Red-eared Slider Trachemys scripta elegans |
82–86°F | 28–30°C | 60–90 days | 4–23 eggs | ⚠️ TSD | Higher temps produce females. Most common turtle in the hobby. Incubate on moist vermiculite. | |
Eastern Box Turtle Terrapene carolina |
80–86°F | 27–30°C | 70–90 days | 3–8 eggs | ⚠️ TSD | Terrestrial turtle. Eggs may require a brief diapause at cooler temps. Some breeders allow short cool period. | |
Painted Turtle Chrysemys picta |
80–84°F | 27–29°C | 65–80 days | 4–15 eggs | ⚠️ TSD | North American species. In wild, eggs near the surface may overwinter — avoid replicating this in captivity. | |
Map Turtle Graptemys spp. |
80–84°F | 27–29°C | 60–80 days | 4–20 eggs | ⚠️ TSD | Multiple species with similar requirements. Protected in several US states — check regulations before breeding. | |
Musk Turtle / Stinkpot Sternotherus odoratus |
78–84°F | 25–29°C | 60–90 days | 1–9 eggs | ⚠️ TSD | Small clutches. Hard-shelled eggs. Popular small turtle. Widely kept — good breeding records available. | |
Reeve's Turtle Mauremys reevesii |
80–84°F | 27–29°C | 60–75 days | 3–9 eggs | ⚠️ TSD | East Asian species. Popular in the hobby. Moderately straightforward to incubate. Multiple clutches per season possible. |
Many reptiles don't have sex chromosomes like mammals do. Instead, the sex of the hatchling is determined by the temperature at which the egg was incubated during a critical developmental window. This is called TSD. Incubating at the wrong temperature won't just affect sex ratios — extreme temperatures can cause developmental problems, deformities, or complete clutch failure. Always research TSD specifics for your species before setting your incubator.
In many turtles and crocodilians, lower temperatures produce females and higher temperatures produce males. Red-eared sliders follow this pattern.
In many lizards including leopard geckos, lower temperatures produce mostly females, mid-range produces mixed, and higher temperatures produce males.
In some species, both extremes produce females while the middle of the safe range produces males. More complex TSD pattern seen in some turtles and lizards.
All snakes and most pythons have genetically-determined sex like mammals. Temperature doesn't affect sex ratios in these species, though extreme temps still harm development.
Even a $30 incubator can outperform a $200 one without a thermostat. Temperature fluctuations of even 2–3°F above the safe range can kill an entire clutch. Always use a quality thermostat, and verify the temperature with a secondary thermometer placed at egg level.
Use a soft pencil to mark an X or arrow on the top of each egg immediately after laying. Rotating a reptile egg after the embryo has attached to the shell membrane can drown the embryo. Never rotate eggs during incubation.
Both are excellent incubation substrates. Vermiculite retains water more readily and is generally preferred for humid species. Perlite drains faster and is useful for drier incubation. A 1:1 ratio by weight of substrate to water is a common starting point for most species.
After 2–3 weeks, shine a bright LED flashlight through the egg in a dark room. Fertile, developing eggs will show pink-red veining and a dark embryo shadow. Infertile or dead eggs will appear yellow/cloudy. Remove dead eggs promptly to prevent mold spreading.
Nestle eggs halfway into the substrate, touching each other is fine. Use small deli cups inside the incubator for each clutch. Write the species, clutch date, and target hatch date on each cup. Separate containers prevent cross-contamination if one egg dies.
Slight denting early in incubation often means the substrate is slightly too dry — add a small amount of water nearby (not on the egg). However, eggs near hatching commonly collapse/deflate — this is normal and means pipping is imminent. Do not add water at this stage.
After pipping, hatchlings may remain in the egg for 12–48 hours while they absorb the yolk sac. Never force a hatchling out of its egg — this can rupture the yolk sac, which is fatal. If a hatchling has clearly pipped but seems stuck after 48 hours, consult an experienced breeder before intervening.
Higher temperatures (within the safe range) generally result in shorter incubation times. Cooler temps extend the incubation period. This is useful for managing hatch dates — incubating at the cooler end of the safe range gives you more time to prepare for hatchlings.