Mountain West RV Road Trip: Colorado, Wyoming, Montana, and Idaho

The Route: Colorado to Montana

The Mountain West RV loop covers extraordinary terrain across roughly 2,800–3,500 miles depending on detours. The classic structure: enter Colorado from the east (Denver or Pueblo), drive west through Rocky Mountain National Park, across Colorado via US-40 or I-70, north into Utah (Arches, Canyonlands), north through Wyoming (Yellowstone, Grand Teton), west into Idaho (Sun Valley, Craters of the Moon), and return via Montana (Glacier) and the Beartooth Highway. This loop is one of the most spectacular routes in North America.

Colorado Highlights

Rocky Mountain National Park: Trail Ridge Road, at 12,183 feet the highest continuous US highway, provides extraordinary views of the Continental Divide. The park campgrounds (Moraine Park, Aspenglen) require recreation.gov reservations months in advance for summer. The park is north of I-70 — Estes Park is the main gateway.

Colorado's Highway 550 (Million Dollar Highway): The stretch between Ouray and Silverton is one of the most dramatic mountain drives in the US — narrow, cliff-edge, spectacular. Class A motorhomes and larger fifth wheels should research clearances carefully; the road is manageable for most rigs but requires attention.

Mesa Verde National Park: Cliff dwellings of the Ancestral Puebloans in southwestern Colorado. The campground books out for summer. Excellent addition to a Southwest loop or Mountain West route.

Wyoming: Yellowstone and Grand Teton

Yellowstone National Park is the centerpiece of any Mountain West RV trip and one of the most challenging campground booking situations in the country. Twelve campgrounds in the park — Bridge Bay, Grant Village, Madison, Norris, and others — book out in minutes when the 6-month reservation window opens. If you miss the window, arrive Monday–Thursday for better odds at the first-come/first-served sections, or stay at campgrounds outside the park in the Gardiner, West Yellowstone, or Jackson area and make day trips.

Grand Teton National Park is connected to Yellowstone by the John D. Rockefeller Jr. Memorial Parkway. The Teton Range provides the most dramatic mountain scenery of any US national park — sheer granite peaks rising directly from a flat valley floor with no foothills to obscure the view. Signal Mountain Campground on Jackson Lake and Colter Bay RV Park are the best in-park options for RVers.

Montana: Glacier and the Beartooth

Glacier National Park's Going-to-the-Sun Road is one of the most spectacular drives in North America — if your rig fits. Vehicle size restrictions on GTTS Road apply to any vehicle over 21 feet (including tow vehicle + trailer length). Most full-size RVs cannot drive Going-to-the-Sun Road. The solution: park at Apgar Campground and drive the road in a personal vehicle, shuttle, or park's free shuttle system.

The Beartooth Highway (US-212) connecting Red Lodge, MT to Yellowstone's northeast entrance is widely cited as the most scenic highway in the US — a long, winding ascent to 10,974 feet through spectacular alpine scenery. RV-accessible with reasonable care; no extraordinary size restrictions.

Timing and Season

The Mountain West at high elevations is a summer destination — July and August are the window for most mountain parks and high-altitude roads. Yellowstone sees snow in June and September; Going-to-the-Sun Road typically opens mid-June and closes in October. Book everything for July and August as far in advance as possible — this is the busiest and most constrained booking environment of any US road trip region.

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