403

#403 is a short spur trail off of #400 that goes straight up the face of a mountain to a ridge line to meet with ATV #321. The southwest end starts in a valley full of granite rock outcroppings and green grassy rolling hills. The views here are fantastic. The trail mostly goes straight up a set of r...

When to go: Summer and Fall typically offer the best window.

Vehicles: ATV, Dirt Bike, Jeep/Truck. Standard offroad prep applies: appropriate tires, ground clearance, and a basic recovery kit.

Southwest Idaho context

Southwest Idaho splits across the Snake River. South of the river is Owyhee high desert — sage flats, slickrock canyons, and a million-plus acres of BLM. North is the Boise National Forest, with mining-era roads, ponderosa, and quick out-of-Boise access. Most weekend trips work off Boise, Mountain Home, Marsing, or McCall.

Best for drivers who understand their vehicle and the cost of a mistake in remote country.