Boiling River (Yellowstone National Park)
Mammoth Hot Springs · Yellowstone North Entrance
Closed when last checked (19 September 2026)Primitiveshort walk (former half-mile trail from the 45th-parallel pullout)no fee
°F scale 60–120
Waternot published
FeeFree to soak
SeasonCLOSED since June 2022 flood
LandNPS (Yellowstone National Park)
WhereMammoth Hot Springs, Wyoming
DriveJackson ≈ 2 h 30, Denver ≈ 9 h 30, Colorado Springs ≈ 10 h 30
Closed. Boiling River, once Yellowstone's best-known river soak near Mammoth Hot Springs, has been shut since the June 2022 flood. The Park Service says swimming there is not possible and gives no reopening date, so don't plan a trip around it. Soaking in the hot springs themselves is prohibited across the park, and thermal water can carry organisms that cause rashes, stomach illness and other infections. The Firehole Swim Area, the park's other river swim, was closed as well. Check the park's swimming page before you count on either.
From National Park Service, last checked 19 September 2026.