Starting June 7, 2026, Zion National Park in Utah will enforce strict size and weight limits on the Zion-Mt. Carmel Highway. The new criteria specify a maximum width of 7 feet 10 inches, height of 11 feet 4 inches, length of 35 feet 9 inches for single vehicles and 50 feet for combined vehicles, and a weight limit of 50,000 lbs. RVs exceeding any of these limits will be denied entry at the East Entrance.