West Pass Hot Spring
West Pass Hot Spring delivers 124°F water at 6,795 feet elevation in the Sawtooth National Forest, one of Idaho's higher-altitude hot springs. Roadside access places it just 18.1 meters from the road on open public land near Sun Valley. Alkaline chemistry (pH 8.5) with elevated sodium at 110 mg/L indicates deep geothermal sourcing.
The spring emerges in the high mountain terrain of Blaine County, surrounded by subalpine meadows and conifer forests typical of the Sawtooth Range's eastern flanks. Annual snowfall averages over 134 inches, and the mean annual air temperature sits at 39°F, producing long winters and short growing seasons. The Big Wood River drainage stretches south toward Ketchum and Sun Valley. Peaks and ridgelines of the Boulder and Smoky Mountains frame the horizon.
The high elevation means snow blocks access from roughly November through May. Summer and early fall provide the best window, though afternoon thunderstorms are common. The roadside location makes this one of the more easily reached high-altitude hot springs. Water temperature at 124°F requires mixing with cooler water before soaking. Wood River Campground, 21 km south, is reservable and sits along the Big Wood River at 6,400 feet.
Limited historical documentation exists for this specific spring beyond its inclusion in geothermal surveys. The Sawtooth National Forest, established in 1905, encompasses the site. The spring sits within the broader Sawtooth National Recreation Area, designated by Congress in 1972 to balance recreation and resource management. Its proximity to Sun Valley, developed as a ski resort in 1936, places it in one of Idaho's earliest recreational corridors.
The water at West Pass Hot Spring is slightly alkaline (pH 8.5).
Some links are affiliate links. We may earn a commission at no extra cost to you.
Overview Wood River Group Overnight Area is located inside the Wood River Campground, which has 30 single campsites for RV's and tent camping, which are available for use on a first-come first-served basis. This campground is located on the banks of the beautiful Big Wood River at an elevation of 6400 feet. Ketchum, Idaho is conveniently close, only 10 miles south. Visitors enjoy fishing, tubing and exploring local trails.Recreation This site is part of the Sawtooth National Recreation Area,...
West Pass Hot Spring sits at 6,795 feet above sea level, way above the mile-high mark. You may not feel the altitude strongly, but hot water still dehydrates you faster at elevation. UV is about 27% stronger than at sea level, so bring sunscreen and drink more water than you normally would.
As an Amazon Associate, we earn from qualifying purchases.
West Pass Hot Spring is road-accessible, so you can bring more gear. The water runs hot, so extra hydration is key. Cold air temperatures make a changing robe or warm layers essential.
As an Amazon Associate, we earn from qualifying purchases.
Springs Near West Pass Hot Spring
More Springs Around 124°F
Slightly Alkaline Springs (pH ~8.5)
Hike 6 waterfalls near West Pass Hot Spring
Looking for more outdoor adventures? Explore waterfall hikes near West Pass Hot Spring, Idaho.