Zion National Park is set to begin enforcing existing size and weight limits on the Zion-Mt. Carmel Highway, affecting large vehicles between Canyon Junction and the East Entrance.
According to the National Park Service, two studies from 1989 and 2019 concluded large vehicles cannot traverse the Zion-Mt. Carmel Highway and Tunney safely, leading to the requirement for weight limits.
Any vehicle taller than 11 feet 4 inches, wider than 7 feet 10 inches, longer than 35 feet 9 inches, or heavier than 50,000 pounds, will not be allowed on the road. Combined vehicles, like trucks with trailers, cannot have a total length beyond 50 feet. Trailers cannot exceed 26 feet in length from hitch to rear axle.
Vehicles exceeding these dimensions will be required to take alternative routes like nearby state highways, many of which are still scenic and enjoyable rides. Enforcement of the weight limits is set to begin on June 7th, 2026.
