Route: Salt Lake City → Arches National Park → Canyonlands National Park → Scenic Byway 24 → Capitol Reef National Park → Scenic Byway 12 → Bryce Canyon National Park → Zion National Park → Zion Canyon Scenic Drive → St. George → Las Vegas ✅ Current month (May) is in this region's prime season. Grand Canyon / Zion / Antelope: Mar-May & Oct best. Jun-Aug 40°C+ heat is dangerous on trails.