Bearded dragons need a basking spot between 95°F and 110°F depending on age, a cool side around 71°F to 77°F, and nighttime temperatures no lower than 65°F. Getting this range right is one of the most important parts of keeping a bearded dragon healthy, because they rely entirely on their environment to regulate body temperature.
Basking Temperatures by Age
Younger bearded dragons need more heat than adults. Babies (under a few months old) do best with a basking spot of 105°F to 110°F. Juveniles can handle a slightly wider range of 100°F to 110°F. Adults thrive at 95°F to 105°F. The reason babies need it hotter is simple: their smaller bodies lose heat faster, and they need the extra warmth to properly digest food and maintain their rapid growth rate.
These numbers refer to the temperature at the surface where your dragon actually sits, not the air temperature several inches away. Surface temps under the basking lamp can run 110°F to 130°F on materials like stone or tile, while the air temperature in the basking zone typically reads 100°F to 120°F. Wood surfaces can reach 140°F without causing burns, but smooth rocks and ceramic can become dangerously hot at the same reading. A temperature gun (infrared thermometer) pointed at the basking surface gives you the most accurate picture of what your dragon is actually experiencing.
The Cool Side Matters Just as Much
The whole point of a temperature gradient is to let your dragon choose where it wants to be. The cool end of the enclosure should sit around 71°F to 77°F during the day. This gives your dragon a place to cool down when it has absorbed enough heat, which is how thermoregulation works in the wild. They bask on hot rocks until their core temperature rises, then retreat to shade or burrows to avoid overheating.
If your entire enclosure is too warm, your dragon has no escape. This is one of the most common mistakes new keepers make, especially with smaller tanks. A 40-gallon tank (the minimum for an adult) can heat up uniformly under a powerful lamp, eliminating the gradient entirely. Larger enclosures, 4 feet or longer, make it much easier to maintain a genuine temperature difference from one end to the other.
Nighttime Temperature Drop
Bearded dragons need cooler nights. Drop the enclosure to 70°F to 75°F after lights go out, with 65°F as the absolute floor. This mimics the natural temperature cycle in inland Australia, where these animals evolved, and it supports healthy metabolism and digestion. If your home stays above 65°F at night, you likely don’t need any supplemental heat after the basking lamp turns off.
If your room drops below 65°F, a lightless heat source like a ceramic heat emitter or deep heat projector can keep the enclosure warm enough without disrupting your dragon’s sleep cycle. Colored “night bulbs” are unnecessary and can actually interfere with rest. Total darkness at night is ideal.
Choosing the Right Heat Source
Not all heat lamps work the same way. The gold standard for a basking spot is a halogen flood lamp. Halogen bulbs produce a type of infrared radiation (called IR-A) that penetrates deep into your dragon’s skin and warms them from the inside out, closely replicating sunlight. This is exactly how wild bearded dragons absorb heat: the sun’s infrared energy pushes into their tissue and releases warmth their body can use.
A deep heat projector can supplement a halogen by adding additional infrared wavelengths that help fill out the heat spectrum. Pairing the two creates a basking zone that mimics the full infrared profile of natural sunlight more closely than either one alone. Keep in mind that heat sources are separate from UVB lighting. Your dragon needs both a heat lamp and a UVB tube to stay healthy.
Every heat source should be connected to a thermostat. Without one, the bulb runs at full power all day. If the basking zone creeps past safe levels and your dragon can’t escape, the result can be fatal. A thermostat dims or cuts the bulb when the target temperature is reached, then allows it to ramp back up as the enclosure cools. This is not optional equipment.
Signs of Overheating
A bearded dragon that’s too hot will show it behaviorally before it shows it physically. Watch for your dragon consistently hiding, pressing against the cool side glass, or refusing to bask at all. A black beard (the darkened throat pouch) can signal stress, including thermal stress. Lethargy and loss of appetite are later warning signs that the enclosure may be too warm overall or that the cool side isn’t providing enough relief.
If you notice these behaviors, check your temperatures with a probe or infrared thermometer rather than relying on the stick-on dial thermometers that come with many starter kits. Those analog gauges can be off by 10 degrees or more and only measure air temperature at one point on the wall.
Brumation and Seasonal Cooling
In the wild, bearded dragons enter brumation (the reptile equivalent of hibernation) during Australian winter, when daytime temperatures drop to 68°F to 72°F and nights fall as low as 40°F to 44°F. Indoor dragons may naturally slow down during fall and winter months, sleeping more and eating less.
If your household temperature stays below 60°F for several days, or if your dragon is housed outdoors, it may slip into brumation on its own. Some experienced keepers intentionally lower enclosure temperatures over several weeks to induce brumation in healthy adults, particularly before breeding. This should only be attempted with a dragon that’s been cleared of parasites and is in good body condition. If your home stays in the normal 60°F to 70°F range and your dragon becomes lethargic, don’t assume brumation. Illness can look very similar.
Quick Temperature Reference
- Baby basking spot: 105°F to 110°F
- Juvenile basking spot: 100°F to 110°F
- Adult basking spot: 95°F to 105°F
- Cool side (all ages): 71°F to 77°F
- Nighttime (all ages): 65°F to 75°F
- Absolute minimum: 65°F