Leopard Gecko Growth Stages: Hatchling to Adult
| Hatchling | 0–3 months |
| Juvenile | 3–10 months |
| Sub-adult | 10–18 months |
| Adult | 18 months+ |
Hatchling (0–3 months)
Fragile and small, hatchlings need daily feeding of appropriately tiny prey, a simpler low-risk substrate, and minimal handling while they settle in. Growth is rapid relative to their starting size.
Juvenile (3–10 months)
The fastest period of visible growth. Daily feeding continues, pattern and coloration mature and can shift noticeably, and this is when many keepers move a gecko into its long-term adult enclosure.
Sub-adult (10–18 months)
Growth rate slows as the gecko approaches full size. Feeding frequency typically drops to every other day, and sex becomes reliably visible (it's often identifiable from around 5–6 months onward, but confidence increases with size).
Adult (18 months+)
Full length is reached, and further weight change is about body condition rather than growth. Feeding shifts to a maintenance schedule, and this is the stage a gecko will spend the vast majority of its 15–20 year life in.
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A single adult leopard gecko needs a 20-gallon long tank as an absolute minimum, with a 36x18 in (40-gallon breeder) footprint now considered the recommended standard — plus a secure lid, an under-tank heater on a thermostat, a thermal gradient, at least three hides, and a shallow water dish.
Set up in this order: substrate, then heat source wired through a thermostat, then hides and water dish, then decor — and run the whole enclosure for at least 24–48 hours to confirm stable temperatures before your gecko moves in.
Hatchlings can start in a 10-gallon tank or tub, juveniles do well in 20 gallons, and adults need a 20-gallon long as an absolute minimum — with 36x18 in (40-gallon breeder) now the widely recommended standard, not just an upgrade.
Heat a leopard gecko enclosure with an under-tank heater and/or overhead heat source (halogen or deep heat projector) wired through a thermostat — a thermostat is mandatory, not optional, and heat rocks should never be used.
Leopard geckos can survive without UVB using dietary D3 supplementation, but current husbandry guidance now recommends low-level UVB (roughly 2–6% T5) as best practice — it improves D3 synthesis, bone density, and natural behavior, and views on it have shifted significantly from older nocturnal-species advice.
Keep ambient humidity around 30–40% across most of the enclosure, with a dedicated humid hide raised to roughly 70–80% to support smooth, complete sheds.