Short answer
Hatchlings cannot be sexed reliably, but once a leopard gecko is about 5 to 6 inches long it is usually easy. Turn it gently and look at the underside. Males have a row of small pre-anal pores just in front of the vent and two bulges behind it, where the hemipenes sit. Females have neither. Markings and color do not tell you the sex.
When you can tell
Hatchlings cannot be sexed reliably. Once a leopard gecko is about 5 to 6 inches long, sexing is straightforward.12
How to check
Hold your gecko gently and turn it so you can see the underside near the vent, the opening at the base of the tail. Support its body and never hold it by the tail.1
| Feature | Males | Females |
|---|---|---|
| Pre-anal pores | A row of small dots just in front of the vent12 | None2 |
| Hemipenal bulges | Two oval swellings at the base of the tail, behind the vent12 | None2 |
| Neck | Thicker and heavier1 | Slimmer |
| Behavior | Rapid tail vibration as a display1 |
Females may show two eggs, one on each side, through the skin of the belly when gravid.1
Common mistakes
- Judging by color or spots. Markings vary by morph and do not indicate sex.1
- Mistaking fat pads for eggs. Two symmetrical fat pads on the belly can look like eggs.1
- Sexing too young. Wait until the gecko is about 5 to 6 inches long.1
Why it matters
- Housing. A male and female should not share an enclosure unless you intend to breed them, and even then only temporarily.2 Our care guide explains why leopard geckos are best kept alone.
- Eggs. Adult females can produce infertile eggs even without a male, and need a moist nest box to lay in.3 See leopard gecko eggs without a male.
Common questions
Can you tell a leopard gecko's sex from its color or spots?
No. Reptiles Magazine's vet author says markings vary by color morph and do not indicate sex.
Does incubation temperature decide the sex?
Yes. Leopard gecko sex is determined by the temperature the egg is incubated at. Reptiles Magazine notes that many breeders incubate to produce more females, so more females are often for sale.
Why does my female look like she has eggs?
She may. Adult females can produce infertile eggs without a male, says the RSPCA. But Reptiles Magazine warns that two fat pads on the belly can look like eggs to inexperienced keepers. If in doubt, ask a vet.
Sources
Numbers in the text link to these sources. We checked each one on the date shown.
- 1Sexing Leopard GeckosMargaret A. Wissman, DVM, DABVP. Reptiles Magazine. Checked Oct 29, 2026.
- 2Leopard Gecko SexingReptiFiles. Checked Oct 29, 2026.
- 3How to care for a leopard geckoRSPCA. Checked Oct 29, 2026.
Update history
- : First published.
- : Re-checked every claim against its sources; corrected wording, numbers and attributions.
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HerpWise Editorial summarizes published veterinary, welfare and specialist care guidance. The sources and check date are listed on each guide. Veterinary review is credited separately when completed.
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