Mosquito Pass is the highest pass in Colorado at 13,186 feet. This rocky and rugged 4WD trail starts climbing toward the pass from the trailhead 1.5 miles east of downtown Leadville. The road starts easy enough as a maintained county road but a sharp left turn just outside the gate of an active mine starts the rocky ascent to the pass and the even rockier descent on the east side of the pass. A high clearance 4WD vehicle is a definite necessity on this trail. Along the way, the trail has incredible views back into Leadville and of Diamond Lake and Mountain Lake. Many ghost towns, mine shafts, and mining artifacts are visible along the road culminating with the artifacts of the New London Mine and the ghost town at the Joe Dandy Mine and North London Mill. The pass usually does not open until the last weekend in July. Plated vehicles can use paved roads to connect to Weston Pass and form a loop back into Leadville. For all other vehicles, the trail is an out and back.
The pass usually does not open until the last weekend in July. Not all trails within an area are open to all vehicle types. Area is subject to seasonal closures. Contact the responsible agency before making plans.