T. rex lived in what is now western North America , mainly parts of the USA and Canada, during the Late Cretaceous period about 68–66 million years ago.

Quick Scoop: Where did the T. rex live?

Paleontologists have found most T. rex fossils in modern-day Montana, Wyoming, North Dakota, South Dakota, and Alberta, Canada. These areas formed part of a large landmass called Laramidia, a strip of continent running along the western edge of what is now North America.

T. rex’s world was warm and humid, with lush floodplains, river valleys, and coastal lowlands—more like today’s Louisiana or the southern US than the dry Great Plains you see there now. It lived in semi‑tropical environments with forests, swamps, and open plains filled with plant‑eating dinosaurs that it could hunt or scavenge.

Scientists currently have no confirmed T. rex fossils outside North America, so when people say “Where did the T. rex live?” they usually mean those western North American regions during the very end of the dinosaur age. New fossils do keep turning up, but as of now, T. rex is considered a Late Cretaceous North American predator, not a global one.

TL;DR: T. rex lived 68–66 million years ago in warm, swampy floodplains and forests in what is now western North America, especially Montana, Wyoming, the Dakotas, and Alberta.

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