Crested Gecko Temperature and Humidity: The Setup Beginners Actually Get Wrong

Updated September 22, 2026. Temperature, humidity, enclosure and feeding figures below were read that day from the RSPCA, Zilla and veterinary-clinic care sheets listed at the end. Celsius values from the RSPCA sheet are converted to °F and rounded to one decimal place. All figures assume an indoor enclosure for one captive crested gecko (Correlophus ciliatus).

Most reptile losses in the first weeks happen because a keeper followed a routine that was correct for a different animal. Crested geckos catch out people who arrive from bearded dragons or leopard geckos in a specific way: the warm, dry tank those keepers are used to is exactly the environment this species handles worst. The mistake rarely looks dramatic. A gecko sits low in the enclosure, stops eating, sheds badly, and by the time anyone checks a thermometer the problem has been running for weeks.

A crested gecko (Correlophus ciliatus). Photo: Lennart Hudel / Wikimedia Commons, CC BY 4.0.

The 80°F line and why it anchors everything else

Zilla's crested gecko care sheet puts it bluntly: these geckos should not be exposed to temperatures above 80°F for long, because it can be fatal. The same sheet gives a preferred range of about 72–75°F. The Long Island Bird & Exotics Veterinary Clinic uses a slightly wider band of 72–80°F during active periods. Both treat 80°F as the edge, not the target.

For a bearded dragon owner, 80°F is the cool end of the tank. For a crested gecko, it is the top of what the animal should have to tolerate. That single inversion explains most first-month failures: a basking lamp installed "just to be safe," a tank placed in a sunny window, or a summer room that nobody measured.

Converting three care sheets into one thermometer

Measurement	RSPCA care sheet	Zilla care sheet	Veterinary clinic guide
Warmest zone	26–28°C (78.8–82.4°F)	Keep below 80°F for any length of time	Up to 80°F
Main daytime range	Cool end 22–25°C (71.6–77.0°F)	About 72–75°F preferred	72–80°F
Night	18–20°C (64.4–68.0°F)	Not specified	Not specified
Humidity	40–50% baseline, boosted to 70%; misting brings 60–80%	Daily misting required	60–80%
Enclosure for one adult	At least 45 cm wide × 45 cm deep × 60 cm tall	18 × 18 in footprint, front-opening, taller than wide	At least 20 gallons, tall
UVB	Medium-output 5–7% UVB lamp, 12 hours on / 12 off	Compact UVB bulb listed	Recommended; replace every six months
Lifespan stated	15–20 years	Not stated	5–10 years

The sheets do not fully agree, and the gaps are worth reading rather than smoothing over. The RSPCA's warm zone reaches 82.4°F, a couple of degrees past the 80°F figure Zilla calls dangerous over time. The likely reason is that the RSPCA describes a small warm patch the gecko can leave, inside a gradient that is cooler elsewhere, while Zilla is warning about the whole enclosure sitting that warm. Humidity differs too: a 40–50% resting level (RSPCA) versus a 60–80% range (the clinic). Lifespan estimates differ by a factor of two and neither sheet explains its basis, so anyone buying a crested gecko should plan for the longer figure. Where they disagree on heat, erring cool is the cheaper mistake: a gecko kept a few degrees cool is rarely in danger, while one held at 84°F can die.

Your room is the heater: a summer headroom table

Because crested geckos generally need no basking bulb, the enclosure mostly follows the room. The useful number is therefore headroom: how far the room already sits from the 80°F line before any lamp, sunlight or electronics add to it. The table below is simple arithmetic against the figures above, not a thermal model of any particular tank.

Room air (°F)	Headroom to 80°F	Where it sits against the care sheets	Practical meaning
70	10°F	Below Zilla's preferred 72–75°F; inside the RSPCA cool end once any light is on	Comfortable; no added heat needed by day
74	6°F	Inside the preferred range on every sheet	Ideal; a UVB fixture alone should not push it over
78	2°F	Upper edge; above Zilla's preferred band	No heat lamp; check the top of the enclosure in the afternoon
82	None (−2°F)	Above the 80°F line; matches only the RSPCA's hottest patch	Cooling needed: move the enclosure, use air conditioning, shade windows

Measure at the height where the gecko actually sleeps and perches, not at the floor. Warm air collects near the top of a tall enclosure, which is exactly where an arboreal gecko spends the day.

Humidity is a cycle, not a setting

Where desert species want a steady dry tank, crested geckos do best with a daily rise and fall: misting pushes humidity up toward the 70–80% range, then the enclosure dries back toward the baseline before the next session. A tank held permanently wet invites mold and respiratory trouble; one kept permanently dry leads to stuck shed, especially on toes and the tail tip.

1. Mist once in the evening, when the gecko becomes active, and add a second light morning misting if the hygrometer drops below about 50% during the day.
2. Read a digital hygrometer mounted mid-height, about 30 minutes after misting and again before the next one. You are looking for a clear peak and a clear dip.
3. If the reading never drops below 80%, cut back and improve ventilation. If it never rises past 60%, mist more thoroughly or add live or artificial foliage to hold moisture.
4. Use a moisture-holding floor such as coconut fibre, which the RSPCA names; keep it damp, not soaked. The veterinary clinic warns that loose substrates like soil or sand can cause impaction if swallowed, so serve food on a ledge or dish rather than on the floor.

The first eight weeks, with a number to check each time

When	Check	Pass condition	If it fails
Before arrival	Run the empty enclosure for 3 days with lights on a 12-hour timer	Top-perch air never above 80°F; night reading 64–68°F acceptable	Relocate the tank before the gecko arrives
Week 1	Leave the gecko alone; the RSPCA advises a week to settle before handling	Diet dish touched within a few days	Recheck temperature at perch height
Weeks 2–3	Feeding rhythm: Zilla suggests feeding 2–3 times weekly	Prepared diet removed within a day, as the RSPCA advises, because it sours quickly	Reduce portion size, not frequency
Weeks 3–5	First shed	Toes and tail tip come clean	Humidity peaks too low; mist more thoroughly
Weeks 5–8	Summer or heating-season test	Hottest afternoon still at or below 80°F	Add cooling; never add a basking bulb
Month 6	UVB lamp age	Lamp replaced on schedule (clinic: every six months)	Replace; output fades before the light looks dim

Over those eight weeks, feeding 2–3 times a week works out to roughly 16–24 meals, and a twice-daily misting routine to about 112 misting sessions. That is a useful sense of scale: the misting is the daily job, while feeding is comparatively light.

Signals worth acting on

• Sitting on the floor near the water dish during the day: often a heat signal. Check the top-perch temperature first.
• Stuck shed on toes or tail: humidity peaks are too low or too brief.
• Refusing food for more than a couple of weeks, sunken eyes, or unusual weakness: see a reptile-experienced veterinarian. These signs can come from illness that has nothing to do with husbandry.
• Stress while handled: the veterinary clinic lists shaking, tail wagging, closed eyes, erratic movement and aggression as reasons to put the gecko back straight away. The RSPCA suggests keeping sessions to around 10 minutes.

If you are coming from a dragon or leopard gecko

Remove the basking bulb, reuse the digital thermometer, and add a hygrometer. The "cool end" of a bearded dragon tank is roughly this gecko's ceiling. From a leopard gecko setup, keep the modest temperatures but add the humidity cycle that an arid species never needed. Neither previous setup carries over unchanged.

Bottom line for a first crested gecko

This guide would plan the whole setup around the room rather than the enclosure. If the room where the tank will stand cannot be kept under about 78°F on the hottest afternoon of the year, the honest answer is to pick a different room or a different species, because no amount of misting fixes chronic heat. Where the sources split on humidity, starting near the RSPCA's lower baseline with clear misting peaks is easier to manage than chasing 80% all day, and it keeps mold down. The cost of this approach is extra equipment up front (a timer, a probe thermometer and a hygrometer) and a daily misting habit that does not take holidays.

Tip: For this species the thermometer and hygrometer matter more than any lamp. A digital terrarium thermometer hygrometer placed at perch height shows both the 80°F line and the misting cycle, and dense reptile habitat decor such as vines and foliage helps hold humidity between mistings. (These are Amazon Associate links — we may earn a small commission on qualifying purchases.)

Related reading on this site

• Thinking Beyond Bearded Dragons? Here's What a Leopard Gecko Setup Actually Needs
• Reptile Quarantine Setup: A Safe Step-by-Step Guide

Sources consulted on September 22, 2026

• RSPCA, Crested gecko care sheet (PDF) — temperatures, humidity, enclosure size, UVB, lifespan, feeding and handling notes.
• Zilla, Husbandry Handbook: Crested Gecko — 80°F warning, preferred range, feeding frequency (manufacturer care sheet).
• Long Island Bird & Exotics Veterinary Clinic, Crested Gecko Care Guide — temperature band, humidity, enclosure size, UVB replacement, substrate and stress signs.

This article is general husbandry information, not individual veterinary advice. If your gecko shows signs of illness, contact a reptile-experienced veterinarian in your area.