Leopard Gecko Enclosure Setup & Tank Size

Last updated: · Reviewed against sources listed below

The minimum leopard gecko tank size for one adult is 36 × 18 × 18 inches (about 50 gallons), and a 48 × 24 × 24-inch enclosure is even better. This guide covers enclosure size, heating, hides, safe substrate, optional UVB and a complete equipment checklist.

Snout to tail tip. Not sure? Keep the typical size filled in.

Housing

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Inside dimensions

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This is our enclosure size calculator, preset for leopard geckos.

Leopard gecko tank size

Older care sheets suggested a 10- or 20-gallon tank, but current guidance recommends more space. An adult leopard gecko is 7–10 in18–25 cm long and uses its whole enclosure at night, hunting, exploring and moving between warm and cool areas.

  • Hatchlings: a 20-gallon long (30 × 12 × 12 in) is fine for the first months, or the adult enclosure with hides placed close together.
  • Adults: at least 36 × 18 × 18 in. Floor space matters most, but a little height lets you add climbing décor, which geckos use more than many people expect.
  • Recommended: 48 × 24 × 24 in for more room and an easier heat gradient.

Front-opening enclosures are easier to work with than top-opening tanks, and approaching from the front is less stressful for a gecko than a hand from above.

Heating layout

Leopard geckos digest using warmth from a warm surface and from above. Put the heat at one end:

  • Warm side: a heat source such as a halogen bulb, deep heat projector or heat mat on a thermostat, giving a warm surface of 90–95°F32–35°C inside or next to the warm hide.
  • Cool side: 70–77°F21–25°C, with its own hide.
  • Night: a drop to about 65–75°F18–24°C is fine.

A heat mat must always run on a thermostat, with the probe on the surface above the mat. Without one, mats can overheat and burn a gecko’s belly.

Hides

Hides are essential for leopard geckos, which spend most of the day in them. Provide at least three:

  1. A warm hide over or under the heat source.
  2. A cool hide at the opposite end.
  3. A humid hide filled with damp sphagnum moss or paper towel, usually in the middle or on the warm side. It helps your gecko shed cleanly.

Hides should be snug, with one entrance, so the gecko can touch the walls on both sides.

Substrate

For hatchlings and young geckos, paper towel or slate tile is safest, because young geckos can swallow loose particles when they strike at insects. For adults, a mix of organic topsoil and play sand, or a similar naturalistic mix, allows natural digging behavior.

Avoid calcium sand, walnut shell and fine loose sand on its own. Feeding insects from a dish or with tongs reduces the chance of swallowing substrate on any surface.

Lighting and UVB

Leopard geckos are most active at dawn and dusk. They can live without UVB if they get vitamin D3 from supplements, but many vets and keepers now recommend a low-output UVB tube (a “shade dweller” tube of about 2.5–7%) across part of the enclosure, giving a UV index of about 0.5–1.5 where the gecko basks, with shaded areas it can retreat to. If you use UVB, reduce D3 dusting. Keep lights on about 12 hours a day on a timer.

Cleaning routine

Leopard geckos usually choose one corner as a toilet, which makes spot-cleaning easy. Remove droppings daily, change the water daily, keep the humid hide damp but not soaking, and deep-clean the enclosure every one to three months. Wash your hands after handling your gecko.

Leopard Gecko enclosure checklist

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36×18×18 in front-opening terrarium

The minimum size for one adult leopard gecko.

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Heat mat or halogen bulb with thermostat

Creates the warm side and prevents burns.

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Three hides, including a humid hide

Warm, cool and humid hides are the core of a leopard gecko setup.

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Digital probe thermometer

Measures the warm-side floor temperature accurately.

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Low-output “shade dweller” UVB tube (2.5–7%)

Optional but increasingly recommended; lets your gecko make its own D3.

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Frequently asked questions

Is a 20-gallon tank big enough for a leopard gecko?

A 20-gallon long works for a hatchling, but current guidance recommends at least 36 × 18 × 18 inches for an adult. The extra space makes it much easier to create warm and cool zones and gives your gecko room to explore.

Do leopard geckos need a heat lamp?

They need a heat source, but it does not have to be a lamp. A heat mat, halogen bulb or deep heat projector can all work, as long as it runs on a thermostat and creates a warm surface of about 90–95°F.

Can leopard geckos live together?

They do best alone. Some keepers house females together in a larger enclosure with extra hides, but fights and stress are common. Never house two males together, and do not house a male and female together unless you plan to breed.

Sources

Where sources disagree we show the range they share. See our sources and methodology for how every number is checked.

Results are estimates for healthy animals. Always consult a reptile veterinarian for individual advice. Read our disclaimer.

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