A leopard gecko is a dusk-active ground hunter from dry, rocky country, and its vivarium is built low and warm: floor heat, three proper hides, and a floor it cannot swallow. Get those three things right and a leopard gecko will settle into a calm, predictable evening routine that can last twenty years.
The enclosure: length and floor, not height
An adult leopard gecko needs floor space rather than volume — a 20-gallon long tank is the floor-level minimum, and a 36x18-inch front-opening enclosure is the better modern standard, giving room for a real temperature gradient and all three hides without crowding. Front-opening doors suit a species that is startled by hands arriving from above. Height of 12–18 inches is plenty; leopard geckos will explore low branches and ledges but they are not climbers, and falls onto hard decor are a genuine risk in tall setups.
Heat from below, measured on the floor
Leopard geckos warm their bellies on sun-heated rock, so the heat source is a mat under one end of the enclosure — always on a thermostat, no exceptions, because an unregulated mat can reach temperatures that burn a sleeping gecko. Set the floor inside the warm hide to around 88–92°F, measured with a digital probe lying on the floor itself or an infrared gun, and let the cool end rest in the mid-70s. Air temperature matters less than floor temperature for this species; a gecko sprawled flat on the warm floor with legs splayed is digesting comfortably, while one that never leaves the warm hide may be telling you the cool end has drifted too cold.
Three hides: the heart of the setup
One hide is not a compromise position for this species; the correct number is three. The warm hide sits over the heat mat. The cool hide sits at the far end. Between them goes the humid hide — a hide with a floor of damp sphagnum moss or paper towel, kept moist, where the gecko retreats to loosen shedding skin, especially around the toes. Most shedding problems in pet leopard geckos trace back to a missing or dried-out humid hide, so mist or re-wet it whenever you spot-clean. Each hide should be snug and dark, with a single entrance the gecko can block with its own curled body.
Flooring: solid and safe
Keep the floor solid: textured tile or slate, paper towel, or a packed topsoil-and-play-sand mix for experienced keepers. Loose calcium sand is the substrate to avoid — a gecko hunting insects mouths the floor constantly, and swallowed sand can compact in the gut. Tile and slate have the bonus of holding warmth from the mat and wearing the gecko's nails down naturally. Add a shallow water dish at the cool end, a small dish of calcium powder the gecko can lick as it chooses, and low decor — cork pieces, a flat stone, a low ledge — arranged so the gecko can cross the whole enclosure under cover if it wants to.
Lighting, evenings and a visible routine
Leopard geckos need a day-night cycle but not bright light; strong lighting makes many hide all day, and albino varieties are especially light-sensitive. A low-level UVB tube on a timer is a sensible modern addition used by many keepers, shaded so the gecko can choose its exposure. Run the enclosure for a few days before the gecko arrives, confirming the warm floor holds its temperature overnight, then leave the new gecko alone to learn its hides for the first week. After that, care is a light evening rhythm — feeding, water, humid-hide checks, shed watch — and keeping those small jobs in KinsLe's Care Teams, each ticked off with a timestamp when done, means a gecko that goes off its food gets noticed in days, not weeks.