Fattest Bear Contest 2025. 2025 fat bear week this year, fat bear week starts on october 2 and concludes on fat bear tuesday, october 8. That’s what the national park service is trying to determine during its annual fat bear.

Some of the largest brown bears on earth make their home at brooks river in katmai national park, alaska. It’s tough to choose which brown bear in alaska’s katmai national park and preserve is looking the fattest this year.