Large vehicles to be restricted from Zion National Park roadway starting in June 2026

Starting this summer, large vehicles will be restricted from using a Zion National Park highway due to safety concerns.

Officials announced that starting on June 7, 2026, “Zion National Park will enforce existing size and weight limits on the Zion-Mt. Carmel Highway” between between Canyon Junction and the East Entrance.

Vehicles exceeding the size restrictions will be turned around.

“Large” vehicles affected by the restrictions are as follows:

• Any vehicle taller than 11 feet 4 inches, wider than 7 feet 10 inches, heavier than 50,000 pounds, or longer than 35 feet 9 inches
• For combined vehicles, such as trucks with trailers, the total length of the configuration cannot exceed 50 feet
  • Trailers cannot exceed 26 feet in length, from hitch to rear axle

“These limits are based on two safety studies from 1989 and 2019, which concluded that large vehicles cannot safely traverse the Zion-Mt. Carmel Highway and tunnel,” the National Park Service (NPS) said.

The safety studies showed that:

• Single and combined vehicles longer than the established limits can’t safely maintain their lane on the highway’s tight curves and switchbacks
• Vehicles wider and/or taller than the limits can’t pass through the Zion-Mt. Carmel Tunnel in a single lane of travel
• Vehicles heavier than 50,000 pounds exceed weight limits on four bridges along the highway

You can learn more about the new vehicle restrictions from NPS here.