Overview
Granite Mountain is the high point of the Flint Creek Range within Deerlodge National Forest, a strenuous summit with panoramic views that reward the effort of the 3,800-foot climb. The 10.4-mile out-and-back is considered one of the most demanding routes in the forest, best suited to hikers with summit experience.
The summit at approximately 10,500 feet offers views across multiple mountain ranges and the historic Flint Creek Valley mining district below. The isolation is exceptional: this is one of the less-visited summits in Montana, and solitude is nearly guaranteed.
The Storm Lake Trail offers a lakeside alternative in the same area of the forest.
The Route
The trail begins at a forest road trailhead and climbs immediately and steeply through conifer forest. The tree cover thins progressively as elevation is gained. The upper third of the route is above treeline on open rock and tundra terrain. The summit is a broad, rocky platform.
When to Visit
Mid-July through September. Snow can persist on the summit well into July in heavy years. Afternoon thunderstorms are a major concern on this exposed summit; start early and plan to descend before noon if storms are forecast.
Practical Details
No facilities. Carry all water. The 10 Essentials are essential for this remote, high-altitude summit. Dispersed camping is permitted below the summit on Deerlodge National Forest lands.
Getting There
From Philipsburg, Montana, drive west on forest roads to the Granite Mountain Trailhead. A high-clearance vehicle is required. Contact the Deerlodge Ranger District for current directions and road conditions.
Leave No Trace
This trail receives enough use that following Leave No Trace principles is important for preserving the experience for future visitors. Stay on the marked trail to prevent erosion. Pack out all waste. Avoid camping within 200 feet of water sources or the trail. Use existing fire rings only where campfires are permitted, and check current fire restrictions at checking conditions before you go before any visit. The trail and surrounding terrain remain in good condition because previous visitors have respected these norms.
Safety Considerations
The strenuous rating reflects the trail's general character under typical conditions. Weather, seasonal snow, and trail conditions can change the experience significantly. Carry the 10 Essentials on any full-day outing. Inform someone of your plans and expected return time before heading out, particularly on longer or more remote trails. Cell service varies throughout Deerlodge National Forest and may be unreliable in canyon bottoms or remote terrain.