Leopard Gecko Escape-Proofing Checklist
Where escapes actually happen
Leopard geckos can't climb smooth glass, but they're surprisingly good at squeezing through small gaps and pushing against loose-fitting lids, especially around sliding glass doors, mesh tops without clips, and the small gaps where cables for heating or lighting pass through the enclosure.
Securing the lid
Sliding glass or acrylic doors should have a locking clip or latch, not just gravity holding them shut — geckos and even accidental bumps can shift an unsecured door enough to escape through. Mesh tops need corner clips, not just their own weight.
Cable and wire gaps
Any hole where a heat mat cord, thermostat probe wire, or light cord passes through the enclosure should be sealed with aquarium-safe silicone or a snug grommet, leaving only enough room for the cable itself.
Build the habit
Check that the lid is fully seated every single time you close the enclosure, especially after cleaning or handling — most escapes happen not from a design flaw but from a lid that wasn't checked after routine access.
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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.