Potosi Hot Springs | Southwest Montana

Potosi Hot Springs is a hidden geothermal mineral water oasis in the Maddison Valley, 54 miles west of Bozeman.

The history of the resort goes back to the 19th century. In 1892, Horace Walter, a carpenter from Indiana, built a swimming pool, bathhouse, and large hotel near the springs.

The resort changed ownership multiple times through the years and, at some point, even abandoned entirely.

In the 1960s, the spring became a popular spot for a counter-culture movement. By 1971, rumors of nudity and drug use made it to the local ranches. They, along with a sheriff, came to the spring, kicked squatters out, and burned down all the shacks. Sheriff even blew up the hot spring pool wall with dynamite.

In 2007, the Texas family purchased the resort and closed it to the public. In 2018, ownership changed again, and the spring was reopened.

Geothermal Water & Soaking

Geothermal mineral water emerges from a spring at 93° F (34° C) and is channeled into the pool and soaking tub.

The 25 ft x 50 ft pool is maintained at around 93° F (34° C).

The water in the indoor soaking tub is heated to 102° F (34° C).

The unique feature of the resort is a wood-burning sauna.

It is a family-friendly resort, so swimming suits are mandatory.

You can soak at the springs if you rent a cabin or book the pool for a private soak. There is no true day-use here because you will have to reserve the entire pool for the group.

Private pool time is between noon and 2 pm, Wednesdays through Saturdays.