What temperature, humidity, and lighting should I maintain for a green anole?
Keep the basking spot at 85–90°F (29–32°C) and the cool side at 75–80°F (24–27°C), with humidity at 60–70% and a 12‑hour photoperiod using a 10‑watt UVB bulb.
Target parameters for a healthy enclosure
Set the basking spot at 85–90°F (29–32°C) and keep the cool end between 75–80°F (24–27°C). Aim for 60–70% relative humidity measured at mid‑level. Use a 20‑gallon (75L) screen cage at least 18in wide and 24in tall to give vertical space. Provide a 12‑hour photoperiod with a 10‑watt UVB bulb rated for reptiles.
Lay a 2‑inch (5cm) layer of coconut fiber or sphagnum moss to retain moisture without becoming soggy. Place a shallow water dish holding ~2oz (60ml) of water for drinking and occasional soaking. Check temperatures with a digital probe placed on the basking rock and at the cool corner. Record readings twice daily to catch drift.
- Basking: 85–90°F (29–32°C)
- Cool side: 75–80°F (24–27°C)
- Humidity: 60–70%
- Enclosure size: ≥20gal, 18×24in
- UVB: 10W, replace every 6months
Why a temperature gradient matters
Green anoles are ectothermic; they move toward heat to digest and toward shade to cool down. A single temperature reading would force the lizard to stay in an uncomfortable spot, increasing stress. By offering a 10‑°F (5‑°C) range, you let the animal choose its optimal zone throughout the day. This self‑regulation also supports proper metabolism and immune function.
In practice you’ll see the anole basking for 30–45minutes after a feed, then retreating to the cooler side for 1–2hours. During night hours the whole enclosure should drop to 70–73°F (21–23°C). Observe these patterns; if the lizard never leaves the warm side, the gradient is too shallow. Adjust by moving the heat source or adding a vent.
Controlling heat and humidity
Mount a 50‑watt ceramic heat emitter on the warm side and plug it into a thermostat set to 88°F (31°C) maximum. A thermostat prevents the lamp from overshooting the basking target. Pair the heater with a small ceramic plate to diffuse heat and avoid hot spots. Verify the surface temperature with an infrared gun aimed at the basking rock.
Mist the enclosure 2–3 times per day using a fine‑mist spray bottle, aiming for droplets that settle on the moss without pooling. A 2‑inch deep substrate will hold enough moisture to reach the 60–70% humidity range. Open a 2‑inch vent near the top of the cage for air exchange; close it briefly after misting to let humidity rise. Use a hygrometer placed at mid‑height to log humidity every 4hours.
- Heat emitter: 50W
- Thermostat max: 88°F (31°C)
- Misting: 2–3×/day
- Vent size: 2in
- Hygrometer reading interval: 4h
UVB and day/night lighting
Position the 10‑watt UVB bulb 6–8in (15–20cm) above the basking platform; this yields roughly 0.5µW/cm² at the lizard’s level. Replace the bulb every 6months because output drops even if the lamp still glows. Keep the UVB on for 12hours, matching the photoperiod of natural daylight. A timer eliminates human error and stabilizes hormone cycles.
At night switch to a low‑intensity red or blue LED that does not emit UVB but provides enough light for feeding. Maintain night temperature at 70–73°F (21–23°C) to prevent a thermal shock. If the anole hides continuously, check that night lighting is truly dim; bright bulbs can disrupt melatonin production. Adjust the timer by 30minutes if you notice delayed activity in the morning.
- UVB distance: 6–8in
- UVB replacement: 6months
- Photoperiod: 12h light / 12h dark
- Night temp: 70–73°F (21–23°C)
Observable signs of out‑of‑range conditions
If the anole’s skin looks pale, the animal is panting, or it spends all day under the heat lamp, the enclosure is likely above 92°F (33°C) or humidity is below 50%. Conversely, a sluggish lizard with a swollen tail and frequent shedding indicates temperatures under 72°F (22°C) or humidity above 80%. Check the thermometer and hygrometer first; equipment drift is common.
Correct a hot enclosure by lowering the thermostat by 2‑3°F (1‑2°C) or adding a vent. If humidity is low, increase misting frequency to four times daily or add a damp hide with a moist towel. For excess humidity, improve ventilation or replace the substrate with a drier mix. Re‑measure after 30minutes to confirm the adjustment took effect.
- Over‑heat signs: panting, constant basking
- Under‑heat signs: lethargy, poor shedding
- Low humidity signs: dry skin, eye irritation
- High humidity signs: fungal growth, soggy substrate
Keep reading about Green Anole: Green Anole care sheet
Related questions
How often should I replace the UVB bulb for my green anole?
Replace the 10‑watt UVB bulb every 6months even if it still lights up, because output drops to about 70% after that time.
What size enclosure is the minimum for an adult green anole?
A screened cage of at least 20gallons (75L) with dimensions of 18in wide by 24in tall provides enough vertical space for climbing and a proper temperature gradient.
Can I use a heat rock instead of a basking lamp?
Avoid heat rocks; they create localized hot spots that can scorch a 5–8‑inch anole. A ceramic heat emitter or basking lamp with a thermostat gives a controllable, even gradient.
Not veterinary advice. This guide covers husbandry — housing, feeding, cleaning and handling. If your green anole is injured, off food unusually long, or behaving abnormally, contact a veterinarian.