How to Set Up a Leopard Gecko Enclosure, Step by Step
Before you buy the gecko
Build and run the enclosure first. Trying to dial in temperatures with an animal already inside adds stress and risk. A 24–48 hour burn-in period lets you confirm the thermostat is holding target temperature before it matters.
Step 1 — substrate
Lay your chosen substrate first: paper towel or tile for a simple setup, or a packed, several-inches-deep soil/sand/clay mix if you're going naturalistic or bioactive. Loose substrate should be firmly packed, not fluffy, so it holds burrow shapes.
Step 2 — heat and thermostat
Install the under-tank heater (covering roughly a third of the floor on one end) or overhead heat source, and wire it through a thermostat — never run a heat source unregulated. This is the step most new keepers skip, and it's the one most likely to injure a gecko if skipped.
Step 3 — hides and water
Place the warm hide directly above the heat source, the cool hide on the opposite end, and a humid hide somewhere in between. Add the water dish on the cool side.
Step 4 — decor and cover
Add climbing branches, cork bark, rock structures (secured, not able to shift or collapse), and any live or artificial plants. More visual cover generally means a less stressed gecko.
Step 5 — test before move-in
Run everything for a day or two with a digital thermometer probe checking the warm hide floor and the cool side ambient. Adjust the thermostat until both sit in range before adding your gecko.
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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.
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.
Leopard geckos typically live 15–20 years in captivity with proper care, with some individuals reaching 25 years or more — the oldest verified captive leopard gecko lived to roughly 28.5 years. Wild geckos live far shorter lives, usually 6–8 years.