RV Guide to Glacier National Park: Size Limits, Routes & Tips

Step 1: Know the Size Limits Before You Go

The most critical fact for any RV trip to Glacier is the vehicle restriction on Going-to-the-Sun Road. Per NPS.gov, the restricted zone runs from Avalanche Creek (west side) to Rising Sun (east side) and enforces three hard limits:

What this means in practice: Class A motorhomes, fifth-wheels, travel trailers over 21 ft, and most Class C rigs over 21 ft cannot drive the scenic alpine middle section. The west entrance road (West Glacier to Avalanche Creek) and east entrance road (St. Mary to Rising Sun) have no size restrictions and are fully accessible.

Common mistake: Arriving at Avalanche Creek in an oversized rig with no backup plan. Rangers will turn you around, and there is no easy place to reverse a large RV on the alpine road. Confirm your dimensions at home and decide your full route before you leave.

Step 2: Plan Your Route Through the Park

Large RVs (over 21 ft) use US Highway 2 as the primary cross-park route. It runs along Glacier’s entire southern boundary from West Glacier to East Glacier Park — 56 miles, approximately 1 hour. The road follows the Middle Fork of the Flathead River and is approved for semi-trucks, so any size RV travels it without issue. Per NPS.gov, there is no fuel inside the park, so US-2 towns are your primary fueling windows.

East-side access from Great Falls: Drive US Highway 89 north (~125 miles to Browning), then follow signs to St. Mary and Many Glacier. Many Glacier Road is paved and accessible to RVs up to 35 feet with careful driving on narrower sections.

2026 closure — Two Medicine Road is shut: Construction on the water distribution system and road rehabilitation continues through late 2027. Do not include Two Medicine in your 2026 RV route, per NPS.gov.

Step 3: Reserve an RV-Friendly Campground

All in-park campgrounds have no hookups — no water, sewer, or electrical connections. Generator hours are restricted. All reservation campgrounds book through Recreation.gov. Peak-season nightly rates are $30/site; shoulder season drops to $20. Per NPS.gov, sites sell out within hours of opening each booking window.

Best choice: Apgar and Fish Creek on the west side offer the largest sites, confirmed dump stations, and proximity to the Lake McDonald area. Many Glacier is the best east-side base for RVs.

Step 4: Fuel Up and Prep Before Entering

There is zero fuel available anywhere inside Glacier National Park. Running low means a long tow on mountain roads. Per NPS.gov, fuel up at these gateway points before entry:

Larger rigs get 8–12 mpg on flat roads and significantly less on mountain grades. Calculate full-loop mileage and add a 20% buffer. Fill to maximum capacity before a multi-day stay.

Step 5: Navigate Going-to-the-Sun Road Safely

If your RV meets the 21 ft / 8 ft criteria, you can drive the full 50-mile Going-to-the-Sun Road. Rangers check vehicle dimensions at Avalanche Creek (west) and Rising Sun (east) during peak season. Do not attempt the alpine section in an oversized rig — there is no viable turnaround point once you’re committed to the switchbacks.

If your RV exceeds the limits, these are the best drop-and-park options before the restriction points:

• Avalanche Creek (west) — largest pull-off before the restriction begins; accessible parking area
• Lake McDonald Lodge area — RV-accessible lot with shuttle pickup available
• Rising Sun (east) — dump station, RV-friendly parking, and shuttle departures nearby
• St. Mary Visitor Center (east) — ample parking, east-side shuttle departure point

GTSR’s alpine section typically opens in late June and closes in October. Check current status at NPS.gov before driving — late snowfall causes day-of closures.

Step 6: Book the Logan Pass Shuttle (2026 Change)

Glacier replaced its free unreserved shuttle with a ticketed Logan Pass shuttle in 2026, per NPS.gov. For oversized RV travelers, this is the primary access route to Logan Pass (6,646 ft) — the park’s most photographed viewpoint.

Important 2026 note: Shuttles will not stop at Avalanche Lake or Trail of the Cedars this year. Those trailheads require driving to Avalanche Creek parking before the size restriction begins. Also, the timed-entry vehicle permit system is discontinued — no advance park entry reservation is needed in 2026, per NPS.gov.

Step 7: Plan Your Dump Station Stops

Glacier has five confirmed dump station locations inside the park, per SaniDumps. Match dump stops to your campground rotation:

Recommended strategy: On a west-to-east loop, dump at Apgar or Fish Creek before departing the west side, then again at Rising Sun or St. Mary on the east side. Stays of 3+ nights without hookups require active black-tank management.