National Forest Development Road 425 is a hiking, biking, and horse trail in White Pine County, Nevada. It is within Humboldt-Toiyabe National Forest. It is 4.3 miles long and begins at 7,176 feet altitude. Traveling the entire trail is 8.7 miles with a total elevation gain of 1,615 feet. The Timber Creek Campground camp site can be seen along the trail.