National park campground RV length limits: a 25 ft rental fits almost everywhere, a 40 ft rig fits less than a third

How many campgrounds your rental fits

We counted a campground as a fit when its posted maximum RV length is at least as long as the rig. Campgrounds with no posted length were left out of the count, which leaves 96 of the 121. A fit means at least one site takes that length, not that every site does.

Which rental size you are actually driving

Rental fleets are sold by class, but campgrounds care about feet. The ranges below are the rough lengths we used for this comparison, not any company's specification. Length varies by model and floor plan, so read the exact overall length on your rental agreement or ask the counter, and add a towed car or bike rack if you have one.

Roads with their own limits

• Glacier, Going-to-the-Sun Road: vehicles and combinations longer than 21 ft (including bumpers) or wider than 8 ft (including mirrors) are prohibited between Avalanche Creek and Rising Sun. Vehicles over 10 ft tall may have trouble west of Logan Pass. Source: NPS.
• Zion, Zion-Mt. Carmel Highway: single vehicles over 35 ft 9 in long, 7 ft 10 in wide or 11 ft 4 in tall, measured with mirrors and attachments, are not permitted between Canyon Junction and the East Entrance. Combinations are capped at 50 ft, with trailers no more than 26 ft from hitch to rear axle. The 7 ft 10 in width cap rules out many motorhomes that are under the length limit. Source: NPS.
• Sequoia, Generals Highway: the park advises against vehicles over 22 ft on the winding road to the Giant Forest and suggests entering via Highway 180 instead. Source: NPS.
• Bryce Canyon: vehicles over 23 ft cannot park in the Bryce Amphitheater during shuttle hours. Source: NPS.
• Big Bend, Chisos Basin: trailers over 20 ft and RVs over 24 ft are not recommended on the narrow, winding road. Source: NPS.
• Yellowstone: the park prohibits the delivery or pick-up of out-of-park rental RVs inside the park, so a delivered rental has to be dropped outside. Source: NPS.

Every campground we checked

What it means for renters

1. Pick the campground first, then the rig. If your trip centers on Glacier, Zion or the Chisos Basin, a camper van or compact Class C avoids the road limits entirely.
2. Get the real overall length of the unit you will be given, including ladders, bike racks and hitch, and compare it with the site length on Recreation.gov, not just the campground maximum.
3. Book the long sites early. Where a park says only a few sites take 35 or 40 ft, those go first.
4. Check the 7 ft 10 in Zion width limit if you rent a wide-body motorhome; mirrors count.
5. If you are doing a one-way rental through several parks, size the rig for the strictest stop on the route.
6. Read how your rental contract handles park roads. See where rental RVs can't go and the RV Rental Fine Print Index.