The signed Above Temple Viewpoint trailhead is 17.6 miles down Hartnet Road from Highway 24. High clearance is required, and four-wheel drive is often recommended. The south Hartnet approach crosses an unbridged Fremont River ford, and wet bentonite can become impassable, so check current NPS road and river conditions before setting out. Spring and fall are the best seasons for these hikes.
There is no potable water in Cathedral Valley, cell service is usually poor to nonexistent, and help may take hours or days. Bring water, food, and emergency supplies. Pets aren't allowed on the route.