Baumgartner Hot Spring
Baumgartner Hot Spring pipes 111-degree water into a large concrete soaking pool right alongside the South Fork Boise River in the Sawtooth National Forest. It sits virtually roadside at 4,980 feet elevation, making it one of Idaho's most accessible developed hot springs.
The pool occupies a clearing in tall conifers beside the river, where cold mountain water rushes past just feet from the warm soak. At nearly 5,000 feet, the forest here is dense Engelmann spruce and Douglas fir. Snow piles over ten feet deep in winter, and the contrast of steaming water against frozen banks draws visitors even in cold months. The concrete pool holds multiple bathers comfortably.
The Forest Service developed Baumgartner in the mid-20th century, piping the naturally alkaline water, pH 9.1, into a constructed pool to make it publicly accessible. The spring's chemistry shows almost no calcium or magnesium, just 3.5 and 0.1 mg/L respectively, with sodium-dominant mineralization typical of deep circulation through Idaho's granitic batholith. Baumgartner Campground sits just over a mile away.
The pool is free and open to the public. Baumgartner Campground, 1.3 miles away, accepts reservations and provides a convenient base. The pool temperature runs around 101 degrees where water enters. Peak season runs June through September, though hardy visitors come year-round. A day-use fee may apply. The pool is cleaned regularly but bring sandals for the concrete deck.
Is Baumgartner Hot Spring worth visiting?
Best for
- Hot spring soaking
- Easy day trips
- Overnight camping trips
The water at Baumgartner Hot Spring is alkaline (pH 9.1).
Overview Baumgartner Campground is situated alongside the South Fork Boise River, 11 miles from Featherville, Idaho. The area offers excellent fishing, hiking and off-road vehicle riding opportunities. Baumgartner Hot Springs is located within the campground, where visitors can enjoy soaking in the pool while admiring the scenic, natural setting. Recreation The campground's main draw is Baumgartner Hot Springs. The 101-degree water is piped into a large concrete soaking pool. The pool...