--- title: "The National Park RV Rule You Need to Know Before Booking Your Campsite" url: "https://camperfaqs.com/national-park-rv-rule-you-need-to-know" author: "Tory Jon" published: "2025-05-05T14:31:45-05:00" modified: "2026-07-20T09:44:12-05:00" --- # The National Park RV Rule You Need to Know Before Booking Your Campsite For many RVers, camping in a national park is the highlight of a trip. The views, wildlife, and proximity to hiking trails make these campgrounds some of the most sought-after in the country. But before you lock in your plans, there's one detail that can make or break your stay: the size of your RV. Most national park campgrounds were built before modern RVs reached today’s sizes. As a result, many sites can’t accommodate longer rigs, and access roads weren’t designed for large vehicles. **Key Highlights** - National parks often limit RV length due to older roads and campground layouts - RVs over 35 feet have far fewer camping options inside national parks - Additional restrictions include height, width, and combined vehicle length - Measure your RV's exact length, height, width, and combined towing length to avoid access issues at parks and campgrounds - Use Recreation.gov and official NPS websites to find campground-specific restrictions ### How Long Is Too Long? According to data gathered by RV Share and publicly available campground records: - About **93%** of national park campgrounds accept RVs up to **25 feet** - At **32 feet**, the number drops to **81%** - At **40 feet**, only **53%** of parks can accommodate - Just **7%** of parks accept RVs over **40 feet** These numbers show a clear trend: the longer your RV, the fewer camping options you’ll have inside national parks. ### Park and State Differences Just because a park allows RVs doesn’t mean your rig will fit. Length limits aren’t the same across the board. Some states are more generous, while others stick to tighter restrictions because of narrow roads, old campground layouts, or terrain. Here’s a look at how it varies: - **Alaska**: Most campgrounds here offer more space. Sites that accept RVs up to 40 feet are common, thanks to larger layouts and fewer space limitations. - **Arizona**: It’s a mixed bag. Some parks allow up to 50 feet, others closer to 30. Always check individual listings, especially in popular parks like the Grand Canyon or Saguaro. - **California**: Expect a wide range. Some parks have newer campgrounds that take 40- to 50-foot rigs. Others, like those along the coast or in the mountains, may max out at 25 to 30 feet. - **Tennessee**: You’ll find everything from 12-foot sites in older parks to 40-foot spots in newer campgrounds. It varies a lot depending on the park and how it was built. - **Maine**: Many campgrounds top out at around 35 feet. That can be a tight fit for fifth wheels and longer Class A motorhomes. - **South Dakota**: Some parks are more relaxed, but not all. Don’t assume every site will fit a big rig just because one or two do. Always read the site details before booking. A campground might accept RVs up to 40 feet overall, but that doesn’t mean every site in the loop can. You’ll want to check the **specific site**, not just the campground overview. ## Other Size Restrictions That Could Impact Your Trip Length isn’t the only factor that matters. Even if your RV fits the campground, getting there may still present challenges due to height, width, and road design. ### Height: Measure Everything Most RVs fall between 10 and 12 feet tall. However, rooftop accessories such as air conditioning units, antennas, satellite dishes, and solar panels can push that number higher. Low tunnels, bridges, and tree-lined roads can create problems for taller vehicles. Zion National Park now prohibits vehicles exceeding certain size or weight limits from traveling the Zion–Mt. Carmel Highway between Canyon Junction and the East Entrance. The limits are: - 35 feet, 9 inches long for a single vehicle - 50 feet in total combined length for a tow vehicle and trailer - 26 feet from the trailer hitch to the trailer’s rear axle - 7 feet, 10 inches wide - 11 feet, 4 inches tall - 50,000 pounds Measurements include mirrors, tires, air conditioners, bike racks, satellite dishes, and other attachments. Vehicles exceeding any one of these limits must use another route. The former tunnel permit and escort system is no longer available. Always measure your RV’s total height and keep the number somewhere visible from the driver’s seat. An RV-specific GPS or routing app can also help identify low clearances and restricted roads. ### Road and Vehicle Width Several parks have winding, narrow roads that weren’t built for wide vehicles. Sharp turns, limited shoulders, and tight clearances are common in parks like **Sequoia** and the **Great Smoky Mountains**. This is especially important for trailers and fifth wheels. Also, watch for limits on **combined vehicle length,** which includes both your RV and any towed vehicles. Some park roads cap total length at 50 feet or less. ## How to Know if Your RV or Trailer Fits National Park Limits National parks are great, but they’re not built for every RV. Some sites are tight, some roads are worse, and if your rig’s too big, you might not get in at all. Here's how to find out if your setup will actually fit. ### Start by Measuring It Yourself Don’t just go off the spec sheet or what the dealer told you. Get out the tape measure and check it yourself. - **Length**: Measure from the very front to the very back. That includes hitches, spare tires, ladders, and bike racks. Anything sticking out counts. - **Height**: Measure from the ground to the top of your tallest roof feature. AC units, solar panels, satellite domes. All of it matters. - **Width**: Measure across the widest point with your slide-outs closed. Slide-outs don’t matter on the road, but they can make tight campsites even tighter. - **Combined Length**: If you’re towing, add the full length of both the RV and the tow vehicle. Some campgrounds and park roads have combined length restrictions. Write your numbers down and keep them handy. You’ll need them when booking sites or planning routes. Guessing doesn't work well at a tunnel entrance. ### Use Recreation.gov to Check Site Sizes [Recreation.gov](https://www.recreation.gov/) is where you’ll book most national park campsites. Each campground page lists size limits, but you’ll get the real info by clicking into individual sites. Look for: - **Maximum vehicle length** - **Driveway surface and dimensions** - **Hookup availability** - **Generator restrictions** Don’t assume a campground can fit your RV just because it’s listed as RV-friendly. Many only have a handful of longer spots, and they go quickly. ### Check the Roads Too Campgrounds aside, getting to them is sometimes the harder part. Some national park roads were built back when RVs weren’t much more than vans. Here are a few examples: - **Zion National Park:** Vehicles exceeding the park’s length, width, height, or weight limits cannot travel the Zion–Mt. Carmel Highway between Canyon Junction and the East Entrance. This includes single vehicles longer than 35 feet, 9 inches, combined vehicles longer than 50 feet, vehicles wider than 7 feet, 10 inches, and vehicles taller than 11 feet, 4 inches. Oversized RVs can still enter through the South Entrance to reach approved parking areas, Zion Lodge with a reservation, or park campgrounds when access and space allow, but they cannot continue past Canyon Junction toward the East Entrance. - **Sequoia National Park**: The Generals Highway has sharp turns and steep drops. Trailers over 22 feet are strongly discouraged. Head to [nps.gov](https://www.nps.gov), find the park’s page, and look for the “Plan Your Visit” or “Road Conditions” section. That’s where you’ll find warnings about road size limits and closures. ### Use the Right Apps and GPS Don’t trust your phone’s default GPS when you’re hauling a 35-foot trailer. It’ll take you right to a 10-foot bridge with no warning. Instead, try: - **RV LIFE App** - **CoPilot RV** - **Garmin RV GPS units** These let you plug in your rig’s exact size and give you routes that avoid low clearances, weight limits, and restricted roads. ### When in Doubt, Just Call If you’re still unsure or your rig is right on the edge of what the site says it allows, call the park directly. Rangers know the layout, and they’ll tell you straight up if your setup won’t work. It's much better to hear it on the phone than to be turned away at the gate.