From Highway 24, the trailhead is 27.4 road miles along Hartnet Road, followed by a dirt spur that runs 0.3 mile north. The full Cathedral Valley loop is about 58 miles and takes six to eight hours. The Hartnet approach has an unbridged Fremont River ford near the highway; don’t attempt it when the water is high. Plan on high clearance, with four-wheel drive sometimes necessary. Rain or snow can make the roads impassable even for high-clearance four-wheel-drive vehicles, so check current road conditions before leaving. Cell service is weak or absent in the district; bring enough water, food, fuel, clothing and emergency supplies.