Lava Hot Springs
Lava Hot Springs ranks among Idaho's most recognized thermal destinations, a system of geothermal mineral springs that the Shoshone-Bannock tribes used for centuries before the town of the same name grew up around them. The state-managed pools hold 113-degree water at 5,115 feet elevation in Caribou County.
The springs surface in a narrow valley where the Portneuf River cuts through southeastern Idaho's basin-and-range topography. Rounded sage-covered hills rise on either side of the small town, and the mineral-rich water feeds into developed concrete pools of varying temperatures. The air is dry and cool, averaging 45 degrees annually, with 68 inches of snow blanketing the valley in winter. Steam clouds rise from the pools and drift across the highway on cold mornings.
The springs discharge along a fault zone where the Portneuf River has exposed deep geothermal pathways. Water chemistry shows a near-neutral pH of 6.8 with total dissolved solids at 776 milligrams per liter, including substantial calcium, sodium, and chloride. The Shoshone-Bannock people considered these springs neutral ground where warring tribes could bathe peacefully. Idaho designated the springs a state resource, and the foundation that manages them has operated the public pools since the early twentieth century.
The developed pools are roadside in the town of Lava Hot Springs, accessible without any hiking. The town has restaurants and shops within walking distance. Pebble Guard Station, a reservable 1933 Forest Service cabin at the base of Bonneville Peak, sits about 17 miles away for those seeking a rustic overnight. Winter visits offer the best contrast between cold air and hot water, though the pools are open year-round.
Is Lava Hot Springs worth visiting?
Best for
- Hot spring soaking
- Easy day trips
- Overnight camping trips
The water at Lava Hot Springs is neutral (pH 6.8) with 776 mg/L total dissolved solids. It is notably rich in calcium (may support bone density and joint health), magnesium (known for muscle relaxation and stress relief), and chloride (natural antiseptic with skin health benefits).
Some links are affiliate links. We may earn a commission at no extra cost to you.
Overview Pebble Guard Station is located at the base of Bonneville Peak along beautiful Pebble Creek, a tributary of the Portneuf River. The rustic one-room cabin offers a secluded retreat on four fenced acres, surrounded by high mountain vistas. The original Pebble Guard Station was built in 1908. The current structure stands at a higher altitude and was built in 1933.Guests can drive to Pebble Guard Station during warmer months, but it can only be accessed by snowmobile or other snow means...