Short answer
A bearded dragon that is cold, still and slow to react can be in deep brumation, chilled after a heat failure, or seriously ill. You cannot reliably tell these apart by looking. Check that the enclosure heat is working, warm the dragon gradually over several hours rather than quickly, and call a reptile vet the same day. Do not assume death, or bury the dragon, until a vet has confirmed it.
First: this is one of the most common panics
You are not the first owner to ask this. Owner forums such as r/BeardedDragons are full of posts about dragons that looked dead.
Many of these dragons were brumating or cold. Some were very ill. The steps below are about getting your dragon the right help, not about diagnosing it yourself.
Three things that can look alike
| What it might be | What usually goes with it |
|---|---|
| Deep brumation | An adult dragon in autumn or winter6 that eats less or stops eating,1 and hides and sleeps more.5 It still moves a little and may come out to drink.1 |
| Chilled after a heat failure | A blown bulb, a tripped thermostat or a power cut. PetMD lists power outages and heat-source failure as causes of hypothermia, with lethargy, reduced activity and sleeping more.3 |
| Serious illness | A slowdown in summer or in a young dragon, sunken eyes, a weak grip, trouble lifting the head, or weight loss.65 |
VCA is clear that inactivity or a refusal to eat is a reason to contact a vet, not something to assume is brumation.2
What to do right now
- Check the heat. Is the basking lamp working? Is the room unusually cold? A dragon in a cold enclosure will be slow whatever else is going on.3
- Touch it gently. Stroke its back or lift it carefully. Note whether it moves, opens its eyes or tightens its grip, even slowly. Write down what you see; the vet will ask.
- Warm it gradually. Bring it to room temperature first, then give it access to its normal heat over several hours. Make sure it can move away from the heat.4 Do not use a hairdryer, hot water or a heating pad pressed against it. PetMD warns that warming a reptile too fast can cause life-threatening complications.3
- Call a reptile vet the same day, while you are warming it.3 If your usual vet does not treat reptiles, the ARAV vet finder lists reptile vets.
- Do not bury or dispose of a dragon you think has died until a vet has examined it.
Preventing the scare next time
- Get a vet check before brumation season.1 A reptile rescue founder quoted by Chewy recommends a fecal test for parasites.6 VCA warns that dragons with intestinal parasites or a poor diet can become critically ill when they wake.1
- Weigh your dragon weekly while it brumates. ReptiFiles treats a loss of more than 10% of its starting weight as a sign of illness.5
- Check on it daily. A brumating dragon may still come out to drink, so keep fresh water available.1
- Plan for power cuts. Keep a thermometer you can read at a glance, and know how you would keep the room warm if the power went out.3
Our full guide to bearded dragon brumation explains how to tell normal brumation from illness week by week.
Common questions
Can a bearded dragon look dead during brumation?
Brumating dragons sleep deeply, hide and move very little, so owners sometimes mistake them for dead. But brumation is not true hibernation: VCA notes a brumating dragon still moves a little and may come out to drink. A dragon that does not respond at all needs a vet.
How do I warm up a cold bearded dragon?
Slowly. Exotics Keeper advises bringing a chilled reptile to room temperature first, then adding heat over several hours, with space to move away from it. PetMD warns that warming too fast can cause life-threatening complications. Call a vet while you do this.
How cold is too cold for a bearded dragon at night?
VCA says extra night heat may not be needed if the cool end stays between 65°F and 80°F. A dragon left much colder, for example after a power cut in winter, should be warmed gradually and checked by a vet.
Sources
Numbers in the text link to these sources. We checked each one on the date shown.
- 1Brumation in Bearded DragonsGregory Rich, DVM. VCA Animal Hospitals. Checked Oct 29, 2026.
- 2Bearded Dragons: HousingGregory Rich, DVM; Laurie Hess, DVM; Rick Axelson, DVM. VCA Animal Hospitals. Checked Oct 29, 2026.
- 3Hypothermia in ReptilesSean Perry, DVM. PetMD. Checked Oct 29, 2026.
- 4Immediate Reptile First AidDr Michaela Betts. Exotics Keeper Magazine. Checked Oct 29, 2026.
- 5Bearded Dragon BrumationReptiFiles. Checked Oct 29, 2026.
- 6Do Bearded Dragons Hibernate?Gail Baker Nelson, reviewed by Ivan Alfonso, DVM. Chewy. Checked Oct 29, 2026.
Update history
- : First published.
- : Re-checked every claim against its sources; corrected wording, numbers and attributions.