Housing and Environment

The short version

• Floor space matters more than height: 36 x 18 x 18 in (90 x 45 x 45 cm) minimum [46], 48 x 24 x 16 in (120 x 60 x 40 cm) preferred [2].
• Basking surface 94–97°F (34–36°C), warm hide 90–92°F (32–33°C), cool side 70–77°F (21–25°C) [2][3].
• Use overhead heat as the main source, and put every heat source on a thermostat [2][3].
• UVB is optional but helpful. Use a low-output tube and give plenty of shade [5][2].
• A humid hide is non-negotiable [2].

Enclosure size

Floor space matters more than height. ReptiFiles recommends a 48 x 24 x 16 in (120 x 60 x 40 cm) PVC enclosure or a 4 x 2 x 2 ft (120 x 60 x 60 cm) wooden vivarium, and advises against 10- and 20-gallon tanks for adults [2].

An older veterinary minimum of 10–15 gallons (38–57 L) for one male [1] reflects the standard of the 2010s. Treat that size as a quarantine or grow-out tub, not a lifetime home. ReptiFiles' separate enclosure-size guide sets 36 x 18 x 18 in (90 x 45 x 45 cm) as the minimum for a single adult [46], and a front-opening enclosure of that size or larger makes a good lifetime home.

Living alone

Keep leopard geckos one per enclosure. Housing them together is a leading cause of bite wounds, dropped tails and broken bones, and this happens among females too, not just males [2]. Males fight. A male and female kept together will breed, and keepers report that constant breeding wears the female down (keeper experience, not proven).

Furnishings

• At least three hides: a warm hide under the heat source, a cool hide, and a humid hide (see below).
• Low, stable rock and cork slabs for climbing and rubbing off shed.
• Decor low enough that a fall cannot hurt your gecko.

Front-opening doors make geckos far less defensive than a hand coming down from above (keeper experience, not proven).

Heat: belly heat versus overhead

Targets: basking surface 94–97°F (34–36°C), warm hide 90–92°F (32–33°C), cool side 70–77°F (21–25°C) [2][3]. At night, temperatures can fall into the low 70s°F (low 20s°C) [1]. A drop to 60°F (16°C) is tolerated, and one source calls a nighttime drop natural and safe [2][3].

Measure surfaces with an infrared thermometer, and keep a digital probe on the basking surface [2].

The old advice was a heat mat under the tank and no lamp, because "leopard geckos need belly heat to digest." There is no veterinary evidence for a belly-heat requirement. Your gecko needs a warm body, and the direction the warmth comes from does not seem to matter (keeper experience, not proven). What a heat mat does well is make a small warm spot under a hide without any light, which is ideal for a quarantine tub or a baby bin [4].

The current advice is overhead heat as the main source. A 50–75 W halogen flood over a flat stone basking spot, or a deep heat projector (infrared with no visible light), warms the whole warm end, both surface and air, and gives a day and night cue [2][3][4]. The downsides: it dries the air and can burn a gecko that climbs too close. Run it on a dimming thermostat and keep it out of reach [3][4].

Backup: if the warm hide will not reach 90–92°F (32–33°C) with overhead heat alone, add a heat mat under the warm hide with about 1 in (2.5 cm) of substrate over it [2][3]. Heat mats warm only a small patch and do not push heat through deep substrate [4].

Thermostats

Every heat source gets a thermostat. Match the type to the device.

Halogens and deep heat projectors need a dimming (proportional) thermostat, not an on/off one [3]. On/off cycling makes the light flash on and off and can shorten bulb life (keeper experience, not proven). A heat mat on a thermostat can still form hot spots away from the probe, so feel the glass and check it with an infrared gun [4].

Put the lights on a timer: 12 hours on in winter, up to 14 hours in summer [3].

UVB: helpful, not required

For twenty years the standard advice was "nocturnal, no UVB needed, use D3 powder." That still works, but the evidence has moved.

What the research shows. Gould and colleagues (2018) kept twelve adult male leopard geckos for 30 days. Six got two hours of UVB a day, one hour at dawn and one at dusk; six got the same light without UVB. The UVB group had significantly higher vitamin D3 levels in their blood, and weight did not change. The study was small, short and all-male, and the authors note that the UVB dose leopard geckos need is still unknown. They recommend offering UVB so the gecko can choose [5]. A 2020 study reached the same conclusion; its title is "The nocturnal leopard gecko uses UVb radiation for vitamin D3 synthesis" [14].

What it means. Leopard geckos are not strictly nocturnal, and they will use low UVB if it is offered [14]. Both the veterinary reference and the hobby reference now call UVB helpful, though not strictly required [1][2].

How to do it safely:

• Use a lower-strength (5–6%) linear T5 tube, such as Arcadia ShadeDweller, Arcadia 6% or Zoo Med 5.0 [2][3].
• Mount it so your gecko is no closer than 10 in (25 cm) at the basking spot, next to the heat lamp, on for 12–14 hours [2][3].
• Screen mesh cuts UV by roughly 15–30%; glass and plastic block it completely [3].
• Albino and other low-pigment morphs are light-sensitive. Use a weaker tube or more distance for them [3].
• Always give shade and deep hides so your gecko can get away from the light.

If you choose not to use UVB, dust every feeding with calcium that contains D3, and give a multivitamin with preformed vitamin A (see the Feeding chapter) [6].

Humidity and the humid hide

Room-level humidity of 30–40% suits the species, with some daily swing and a damper cool end [2]. LafeberVet gives a wider 40–60% [1]. The point is that the air should be fairly dry while one hide stays damp.

The humid hide is non-negotiable. Use a closed container, such as a deli cup with a doorway or a commercial cave, packed with moist sphagnum moss, coco fiber or paper towel. Place it on the cool side or straddling the gradient, and keep it at 70–80% humidity inside [2].

Your gecko uses it to loosen shed, to drink condensation, and as a cool retreat. Re-wet it every few days, and replace the moss when it smells. Vets link repeated stuck sheds on the toes and tail to low humidity, and a moist hide helps prevent them. Poor diet, especially low vitamin A, can also cause shedding problems [7].

Substrate and the impaction debate

What vets see. Gut impaction shows up as lethargy, straining, not eating and sometimes prolapse. It is most often linked to sand, fine sharp gravel and crushed walnut shell, and vets specifically advise against calcium sand [7]. Many keepers believe geckos eat calcium sand on purpose for the calcium (keeper experience, not proven).

What keepers argue. Healthy, warm, hydrated, well-supplemented geckos on a soil-based arid mix pass small amounts of swallowed substrate without trouble (keeper experience, not proven). ReptiFiles' substrate guide says impaction is almost always caused by poor husbandry, such as a gecko that is too cold or already sick [47]. ReptiFiles calls substrate "controversial" and supports a well-drained, soil-like mix only for geckos that are heated, hydrated, lit and healthy [2]. Its substrate guide gives a home mix of about 60% organic topsoil, 30% sand and 10% clay, or you can use a commercial arid blend [47].

What we recommend:

• Paper towel, newsprint or a solid washable mat for quarantine, babies, sick geckos, and your first month as a new owner [2][8].
• A soil-based arid mix, packed at least 4 in (10 cm) deep, for healthy adults with correct heat and UVB. Depth lets your gecko dig and helps hold the humidity gradient. Remember that a heat mat cannot warm through this much substrate, so rely on overhead heat [2][4][47].
• Never calcium sand, fine gravel, crushed walnut, wood chips or reptile carpet [47]. Carpet snags toes and holds bacteria (keeper experience, not proven).
• On loose substrate, feed from a shallow dish or with tongs to cut down on swallowed substrate.