Should Leopard Gecko Temperatures Drop at Night?
Why some drop is natural
Desert and semi-arid habitats naturally cool at night, so a mild temperature dip after dark isn't unnatural for the species — this differs from a daytime temperature failure, which is a husbandry problem rather than a normal cycle.
What a safe nighttime range looks like
Many keepers let the warm side settle a few degrees lower overnight (rather than maintaining daytime peak temperatures around the clock), while making sure the cool side and general ambient temperature don't drop into an uncomfortably cold range for the room.
Whether to turn off the heat source entirely
Turning off supplemental heat entirely overnight is only appropriate if room temperature reliably stays within a safe range on its own — in a cooler home or climate, keeping some heat running (even at a slightly reduced level) is safer than relying on ambient room temperature alone.
UVB and nighttime
UVB lighting should always go off at night regardless of heating decisions — leopard geckos don't need light exposure after dark, and constant lighting disrupts their natural cycle.
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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.