Red Eared Slider Egg Incubation Calculator

Red-eared slider turtle eggs take 75 days on average to hatch, with a normal range of 59–90 days. Incubation length is directly tied to temperature: warmer incubation hatches faster, cooler incubation takes longer.

Select the incubation temperature band closest to your setup from the calculator above and enter the lay date, since temperature substantially changes both incubation length and hatchling sex in this species.

Red-eared sliders use temperature-dependent sex determination (TSD). Incubating around 73–77°F tends to produce mostly males, temperatures around 79–81°F produce a mixed sex ratio, and temperatures around 86–88°F tend to produce mostly females. This is the opposite pattern from some lizard species.

Females need access to loose, diggable soil or sand near the water, in a sunny spot, to dig a flask-shaped nest chamber 4–6 inches deep. In captivity, provide a nesting box with moist sand/soil at least 8 inches deep.

Natural nests are exposed to predators, flooding, and unpredictable temperature swings, so most keepers move eggs to a controlled incubator soon after laying (without rotating them from their original orientation) for more reliable, predictable hatch outcomes.

Red-eared sliders are invasive in many regions outside their native range, and releasing captive-bred or captive-raised turtles into the wild is illegal in many areas and can spread disease to wild populations. Captive-hatched hatchlings should be kept in captivity, not released.

House hatchlings in a shallow aquatic setup with a basking area reaching 90–95°F, UVB lighting, and water kept clean via filtration. Offer a mix of commercial turtle pellets, leafy greens, and occasional protein starting once the yolk sac is fully absorbed.

At 75 days average, red-eared sliders incubate similarly to a Russian tortoise (60–75 days) but faster than most other tortoise species, and considerably faster than monitor lizards (165 days).