Southeast of Deer Lodge in the Beaverhead-Deerlodge National Forest, there are 40 miles of groomed snowmobile trails at elevations ranging from 5,300 to 8,000 feet. These groomed trails are maintained by the Deer Lodge Snowmobile Club.
To reach the snowmobiling trailhead for Deer Lodge from US80 in Deer Lodge, use Exit 186 and head southeast on FS82 (aka Boulder Road) for 6 miles to the trailhead parking.
Boulder River Road (1) - A 15 mile route starting at the Peterson Creek Parking Area and heading to Thunderbolt Creek via Orofino Campground and Champion Pass. This groomed trail is a good family ride.
Spring Emery Road (4) - A 12 mile route from Peterson Creek Parking Area to Emery Mine. This groomed route is a good family ride.
Leadville Loop (2) - An 15 mile route from Champion Pass along the Continental Divide to Leadville. This ungroomed route is very difficult.
Cottonwood Lake Loop (3) - A 12 mile route from the Head of Rock Creek in the Leadville area to Cottonwood Lake, then down Thunderbolt Creek to Boulder River Road. It starts from the Peterson Creek Parking Area. This ungroomed route is very difficult.
Overall, Deer Lodge is the 9th most popular snowmobile trail of all 33 snowmobiling rides in Montana.