No Tunnel? No Problem: Navigating Zion’s New 2026 Vehicle Restrictions
If you’ve ever driven the Zion-Mt. Carmel Highway, you know it’s one of the most spectacular roads in America. You also know it’s incredibly narrow. Built in 1927, the historic 1.1-mile tunnel and the switchbacks leading up to it were designed for Model Ts, not modern 40-foot luxury RVs or massive tour buses.
For years, the park managed this by having rangers “escort” large vehicles through the tunnel in a single lane. But as of June 7, 2026, that era is coming to an end.
To improve safety and reduce the massive traffic jams at the tunnel kiosks, Zion National Park is implementing strict, permanent vehicle size and weight limits. If your vehicle exceeds these limits, you will no longer be permitted to drive the highway between Canyon Junction (inside Zion Canyon) and the East Entrance.
Here is everything you need to know to ensure you don’t get turned around at the gate.
The New 2026 Size & Weight Limits
Starting June 7, 2026, commercial buses and oversized vehicles exceeding 35’9″ will be prohibited from the Zion-Mt. Carmel Highway.
Starting June 7, 2026, if your vehicle—including mirrors, awnings, and bike racks—exceeds any of the following dimensions, it is prohibited from the Zion-Mt. Carmel Highway:
- Height: 11 feet 4 inches (3.45 meters)
- Width: 7 feet 10 inches (2.39 meters)
- Weight: 50,000 lbs (22,680 kg)
- Single Vehicle Length: 35 feet 9 inches (10.9 meters)
- Combined Vehicle Length (Truck + Trailer): 50 feet (15.24 meters)
- Note: For trailers, the length from hitch to rear axle cannot exceed 26 feet.
Important for Dually Owners: Many modern “dually” pickup trucks exceed the 7’10” width limit. If you are driving a heavy-duty truck, measure your wheel-well-to-wheel-well width before you arrive!
Why the Change?
In a 2016 study, the park found that the “escort” system for large vehicles resulted in an average of only 19 minutes of free-flowing traffic per hour. This created a bottleneck that backed up traffic for miles into the main canyon and East Zion.
By removing oversized vehicles from this historic corridor, the park aims to:
- Protect the Tunnel: Reduce the risk of “bridge strikes” and wall scrapes.
- Ensure Lane Safety: Ensure vehicles can stay in their own lane through the dozens of sharp “S-curves” on the east side.
- Restore the Experience: Return the highway to a scenic drive rather than a parking lot.
What Happens if You Are Over the Limit?
Rangers will be stationed at both the South and East entrances to measure vehicles. If you exceed the limits:
- You will be instructed to turn around.
- If you enter from the South (Springdale): You can still access the Visitor Center, Zion Lodge, and campgrounds, but you cannot proceed past Canyon Junction toward the tunnel.
- If you enter from the East: You will have to take an alternate route around the park via Highway 89/389. For a more scenic alternative, you can cut across using the Sand Dunes Road that connects Mt. Carmel Junction to Colorado City, AZ. This route takes you directly past Coral Pink Sand Dunes State Park, an iconic and breathtaking section of Southern Utah that is well worth the drive.
The “Guide Hack”: How to See the East Side Without the Stress
These new rules might feel like a roadblock, but they are actually a great reason to change how you explore. Some of the most stunning views and secret canyoneering spots are located on the “restricted” side of the tunnel.
Coming from the East? Make it a Scenic Journey. If you are entering from the East, the drive past the Coral Pink Sand Dunes is a must-see detour. The bright orange dunes against the high-desert backdrop are a photographer’s dream.
Instead of worrying about fitting your rig through the tunnel, park your vehicle and let us show you the “Quiet Side” of Zion: 
- Off-Road + Canyon Tour (Full Day): Located right next to the Coral Pink Sand Dunes, this is our premier backcountry experience. We’ll take you deep into the sand in our specialized 4×4 vehicles to access remote slot canyons far from the shuttle crowds.
- Diana’s Throne (Half-Day): Located near Mt. Carmel Junction, this is the perfect technical canyon for beginners. It’s an efficient, 4-hour adventure that fits perfectly into your travel day before you head to your next destination.
We’ll handle the navigation, the technical gear, and the tunnel logistics—you just focus on the rappels.
Plan Ahead for 2026
Zion is evolving, and these new rules are a big part of preserving the park’s magic. Measure your vehicle today, and if you’re over the limit, let us help you find a better way to see the “Quiet Side” of Zion.