Hot River Look only

Hot River reads 136°F at the source (NCEI, historical reading). Managed by Yellowstone National Park (checked 2026-08-19).

Cool Warm Hot Boiling-class 136°F

136°F / 58°C

Hot range at the source — hotter than a hot tub

Reading from the NCEI Thermal Springs List (historical reading, 1981 compilation). Source temperature — lower pools usually run cooler.

Water temperatures change with flow and season — test before entering, and never submerge your head in warm natural water. CDC guidance on Naegleria fowleri.

The rule here

This is a thermal feature to see, not a place to get in the water. Yellowstone National Park puts it this way:

“On the other end of the temperature spectrum, the water in park hot springs often reaches the boiling point. For this reason, and to protect the park's unusual thermal environments, soaking in hot springs is prohibited.”

— Yellowstone National Park, checked 2026-08-19

Worth knowing: This is the Boiling River area near the 45th parallel. The park states that swimming is not possible at Boiling River because of the impacts to the river from the 2022 floods.

Nearby springs

Identity, coordinates, and temperature quoted from the NCEI Thermal Springs List (historical reading, 1981 compilation).