Boiling River Hot Springs

Boiling River is a geothermal mixing spot in northern Yellowstone National Park, near Mammoth Hot Springs. Hot spring water once flowed into the cold Gardiner River here, creating a natural pool for soaking, with small cascades nearby and a short trail leading to the river. Swimming is currently closed because of damage from the 2022 floods, so plan this stop as a riverside walk rather than a soak. Stay on the designated path, and check whether access has changed before you go.

Where the river waters meet

Boiling River is in northern Yellowstone, near Mammoth Hot Springs and the park’s North Entrance. Hot water from a geothermal feature flows into the cold Gardiner River. Their meeting point created a naturally warmed stretch of river, with short cascades nearby.

A maintained trail leads from the parking area to the river. Keep to the designated route, and do not enter water before reaching the former bathing area: geothermal water can be dangerously hot.

Swimming access and safety

Swimming at Boiling River is currently closed because of damage caused by the 2022 floods. The material available does not establish when it will reopen, so check the latest access information before setting out. Treat the stop as a walk unless swimming has been confirmed as permitted.

When the area is open, the mixing point can have different water temperatures depending on where you stand. Yellowstone’s hot springs can cause severe burns, so only enter areas specifically designated for bathing. If you are looking for a place to swim while Boiling River is closed, Firehole Swim Area is listed as an alternative, though access there can also depend on conditions.