When iguanas get too cold, their bodies start to shut down in a reversible way: they become stiff, lose their grip, and can literally fall out of trees, but many of them wake back up once it warms.

What happens to iguanas in the cold?

  • Iguanas are cold‑blooded , so they rely on external heat to keep their bodies functioning.
  • When temperatures drop into roughly the 40s Fahrenheit (single digits Celsius), they become “cold‑stunned”: muscles stop working, they can’t move, and they may look frozen or dead.
  • In this stiff, stunned state they often lose their grip on branches and fall from trees , which is why people in places like Florida sometimes get “falling iguana” alerts during cold snaps.
  • Despite the dramatic fall, many of these iguanas are still alive; they’re in a kind of temporary torpor and can start moving again once temperatures rise above about the low‑50s Fahrenheit.
  • If the cold is too intense or lasts too long (for example, staying in the 40s or lower for many hours), some iguanas — especially smaller ones — may not survive.

In short, cold weather doesn’t instantly kill iguanas; it usually “pauses” them, sometimes quite dramatically, and only prolonged or severe cold becomes deadly.

Mini FAQ

Do they actually freeze solid?
Not like ice cubes, but their muscles and nervous system slow so much that they appear frozen in place and can’t move.

Are they dead when they fall?
Often no. Many are just cold‑stunned and will revive as the day warms up.

Is this a new phenomenon?
The behavior itself isn’t new, but it’s become more visible because invasive green iguana populations have surged in places like Florida, so more people see and film it and it trends online.

Quick safety and ethics notes

  • Don’t assume a motionless iguana is dead; it may wake up and scratch or bite once warmed.
  • Wildlife agencies in Florida classify green iguanas as invasive, so handling, relocating, or keeping them can be regulated or require permits.
  • If you see one that’s injured or clearly suffering, local wildlife control or a licensed rehabilitator is usually the recommended contact rather than taking it home.

TL;DR: In the cold, iguanas slow down, go rigid, can fall from trees, and often “come back to life” when things warm up, but long, hard freezes can kill them.

Information gathered from public forums or data available on the internet and portrayed here.