Planning a Montana RV Trip: Season, Routes & What to Know

Montana punishes poor planning more than most destinations. The camping season is brutally short. Rig size restrictions at the state’s most famous park will physically turn you around if you show up in the wrong vehicle. Reservations at the marquee campgrounds operate on a system that requires calendar alerts and fast fingers. And the gaps between services — fuel, groceries, cell signal, dump stations — can stretch across hours of driving through country so beautiful you almost forget you are running on a quarter tank.

The payoff is worth the logistics. A well-planned Montana RV trip connects glacier-carved peaks, cold blue lakes, and river valleys thick with cottonwood and elk — landscapes that reward exactly the kind of slow, self-contained travel an RV provides.

This guide covers the route framework from Glacier to Yellowstone, when to go and when to stay home, what your rig can and cannot handle, and the reservation strategies that separate people who get campsites from people who spend their trip refreshing Recreation.gov in a Walmart parking lot.

For a broader look at specific parks statewide, start with our best RV parks in Montana guide.

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The Route: Glacier to Yellowstone#

Most visitors come to Montana for Glacier or Yellowstone. The better play is to connect them, because the corridor between the two parks passes through lake, river, and mountain country that most tourists blow past in a hurry to reach the headliners.

The route runs roughly 500 miles from West Glacier to West Yellowstone. Driven straight, that is eight or nine hours. You should not drive it straight. Spread it across ten to fourteen days.

Leg 1: Glacier National Park (3-4 Nights)#

Start at Glacier. The rig size restrictions here are the tightest you will face on the entire trip, and you want to deal with them while your energy is high rather than at the tail end when patience is thin. Read the rig size section below before committing to camp inside the park — if you are driving anything over 21 feet in towed length, your options are severely limited.

For a deep dive into every campground in the area, see our full Glacier National Park RV camping guide.

Suggested stops:

• Fish Creek Campground (west side) — 178 sites, dense forest, Lake McDonald access, no hookups, $30/night. Loop C is no-generator for genuine quiet. Best for experienced dry campers under 25 feet.
• Apgar Campground (west side) — 194 sites, longest season in the park (May through September), showers, $30/night. More social than Fish Creek. Sunset views across the lake toward the peaks are worth every minute.
• St. Mary Campground (east side) — The only Glacier campground with reliable cell service. Opens earliest (mid-April), $20/night in shoulder season. More accommodating for larger rigs since you do not need to navigate Going-to-the-Sun Road to reach it.
• West Glacier KOA — Full hookups, 30/50 amp, pool, hot tubs, pull-throughs for big rigs. Three miles from the West Entrance. $133-167/night in peak season. This is where your 40-foot fifth wheel stays while you day-trip into the park.

Leg 2: Flathead Lake (2-3 Nights)#

From West Glacier, drive south on US-93 to Flathead Lake — about 45 minutes to Bigfork on the northeast shore. Most people skip this stretch heading straight for Glacier. That is a mistake. Flathead Lake is the largest natural freshwater lake west of the Mississippi in the lower 48, and the camping around its shoreline is less competitive, less expensive, and more relaxing than anything near the national park.

The east shore between Bigfork and Polson runs through cherry orchard country. If you are traveling in late July, the Flathead Cherry Festival in Polson is worth a stop. Water clarity can reach thirty feet of visibility.

For full coverage of every campground on the lake, see our Flathead Lake camping guide.

Suggested stops:

• Wayfarers State Park (Bigfork) — 30 sites, electric at select sites, $4-34/night. Beautifully maintained on the northeast shore. Popular with long-distance cyclists on the Continental Divide route.
• Finley Point State Park (south of Bigfork) — 18 RV sites with electric, boat slips, marina. Secluded Ponderosa pine forest on a peninsula. Best combined camping-and-boating setup on the lake.
• Big Arm State Park — 41 sites, yurts available, pebble beach. Primary launch point for Wild Horse Island, a 2,163-acre primitive state park accessible only by boat, home to bighorn sheep, wild horses, and bald eagles.
• Polson / Flathead Lake KOA — Full hookups, heated pool, big-rig pull-throughs, $10-80/night. Panoramic views of the Mission Mountains. Best option if you need full services and want a Flathead Lake base.

Supplies: Polson has a Safeway, Walmart, and full services. Kalispell — 20 minutes from Bigfork — has Costco, Home Depot, and RV service shops. Stock up before heading south.

Leg 3: Bozeman Area (1-2 Nights)#

From Polson, take US-93 south to Missoula, then I-90 east to Bozeman — about four hours. Bozeman is the logical midpoint between the two parks and the best resupply point on the route, with a college-town downtown and more restaurant options than anywhere else you will stop.

Suggested stops:

• Bozeman Hot Springs Campground — 119 sites, full hookups, big-rig friendly. The draw is twelve hot springs pools (two passes per reservation). The price is steep at roughly $152/night in peak season, and noise complaints are a recurring theme in reviews. Worth it for one night if the hot springs appeal to you.
• Bear Canyon Campground — 6 miles east of downtown off I-90. Full hookups, 20/30/50 amp, pool, $50-70/night. Watch for the low bridge at the I-90 overpass near the entrance — 13’3” clearance. Confirm your route.
• Red Cliff Campground (USFS, Gallatin Canyon) — 63 sites, 25 with electric, $20-28/night. Located on Highway 191 roughly halfway between Bozeman and West Yellowstone. Vault toilets, no showers, no dump station. Beautiful riverside setting in the Custer Gallatin National Forest.

Leg 4: West Yellowstone & Yellowstone (3-4 Nights)#

From Bozeman, Highway 191 runs south through Gallatin Canyon — one of the most scenic river canyon drives in Montana — directly to West Yellowstone. The drive is about 90 minutes. West Yellowstone is a purpose-built gateway town with more full-hookup RV sites per square mile than almost anywhere in the state, walkable streets, and the park entrance minutes away.

For detailed coverage of every park in the area, see our West Yellowstone RV parks guide.

Suggested stops:

• Yellowstone Grizzly RV Park — 228 sites, full hookups with 20/30/50 amp, cable TV, Wi-Fi. Paved pads, 80-foot pull-throughs for the biggest rigs. Three blocks from the West Entrance, walkable to dining and shopping. Dynamic pricing means $80-120+ per night in peak season. Avoid sites #1-4 (adjacent to the dump station). Immaculately maintained.
• Buffalo Crossing RV Park — Newest park in town, closest to the West Entrance. Full hookups on all sites.
• Yellowstone Holiday — On Hebgen Lake, 15 minutes from the West Entrance. Good option if you want lake access and a quieter setting than the in-town parks.

From West Yellowstone, the park’s western loop — Madison, Old Faithful, Grand Prismatic — is the most RV-friendly section of Yellowstone, with wider roads and better pullouts than the northern or eastern routes.

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When to Go#

Montana’s camping season is short and non-negotiable. The weather decides when it starts.

The Sweet Spot: Late June Through Early September#

Most mountain campgrounds open in late May or early June and close by early September. Going-to-the-Sun Road in Glacier typically does not fully open until mid-to-late June, and in heavy snow years it may not open until July.

July is peak season — longest days, warmest weather, biggest crowds. Daytime highs in the valleys reach the 80s and 90s. If July is your only option, book everything the moment reservation windows open.

August stays warm but crowds thin slightly. Wildfire smoke becomes a real factor — western Montana has experienced significant smoke events in recent years. Check AirNow.gov before and during your trip.

Early September is arguably the best window. Crowds drop substantially, fall color begins at elevation, and the weather is usually stable — warm days, cool nights in the 40s. Some campgrounds close in the first week of September, so check dates.

Shoulder Seasons and Winter#

May and late September are a gamble. St. Mary Campground opens as early as mid-April at a discounted $20/night, but mountain passes and Going-to-the-Sun Road are often still snowbound. Nighttime temps at 4,500+ feet drop into the 20s and 30s.

Late September can be gorgeous — golden aspens, empty campgrounds — or it can be 28 degrees with six inches of snow. Montana does not ease into winter. It switches.

Winter RV camping is not advisable unless you are specifically set up with winterized plumbing and heated underbellies. West Yellowstone regularly records the nation’s lowest temperature on any given January night. Most parks close mid-October.

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Rig Size: The Hard Constraints#

This is the section that saves you from a very bad day. Montana’s rig size restrictions — particularly at Glacier National Park — are more severe than what most RV travelers encounter anywhere else in the country, and they are enforced without exception.

Glacier National Park#

Going-to-the-Sun Road prohibits vehicles and vehicle-trailer combinations longer than 21 feet or wider than 8 feet between Avalanche Creek and Sun Point. This is not a guideline. Rangers will turn you around. The road was carved into a mountainside in the 1930s and the engineering has not changed.

Inside the park campgrounds, most driveways were designed for 1960s camping rigs. The practical limits:

• Fish Creek and Apgar: Limited sites accommodate 26-30 feet. Most sites are comfortable at 25 feet or under.
• Many Glacier: Most sites will not accommodate slide-outs. The NPS specifically recommends St. Mary instead if you need slides.
• St. Mary: The most accommodating for larger rigs on the east side, since you reach it without navigating Going-to-the-Sun Road.

If you are driving a rig over 30 feet, your Glacier camping is limited to private parks outside the park boundary — West Glacier KOA, Glacier Peaks, West Glacier RV Park. These are perfectly good options, and day-tripping into the park is straightforward. Just accept it and plan accordingly rather than trying to squeeze into a site that was not designed for your vehicle.

RV and trailer delivery within park boundaries is prohibited. You cannot have a rental unit delivered to a Glacier campground. You must drive it in yourself.

Yellowstone Area#

The West Yellowstone gateway parks are built for big rigs. Yellowstone Grizzly RV Park handles rigs up to 80 feet on its premium pull-throughs. Inside Yellowstone itself, the campgrounds are more restrictive — most max out in the 30-40 foot range depending on the specific site — but the roads are wide and well-maintained. Nothing inside Yellowstone approaches the severity of Glacier’s Going-to-the-Sun Road restrictions.

Highway Considerations#

Montana’s major highways (I-90, I-15, US-93, US-191) all handle full-size RVs without difficulty. Watch for wildlife on Highway 191 through Gallatin Canyon — active elk and deer country, especially at dawn and dusk. Two campgrounds near Bozeman — Bear Canyon and Bozeman Trail — have low bridge clearances of 13’3” near their entrances.

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Reservations: How the System Actually Works#

The reservation landscape breaks into three systems.

National Park Campgrounds (Recreation.gov)#

Glacier campgrounds use a six-month rolling reservation window on Recreation.gov. Every day, a new batch of sites opens for the date exactly six months out. July and August weekends sell out within minutes of opening.

The four-day short-term release: Glacier also releases sites four days before each camping date. If you missed the six-month window, this is your second chance — be ready at release time (usually 7:00 AM Mountain).

Tips that work:

1. Create your Recreation.gov account and save payment info before reservation day.
2. Be flexible on dates — midweek arrivals are significantly easier to book.
3. Target St. Mary Campground. Less competitive than Apgar or Fish Creek, and the only Glacier campground with decent cell coverage.
4. Have a backup plan. Private parks outside the gates operate on normal booking timelines.

Montana State Parks (ReserveAmerica)#

Substantially less competitive than Glacier. Booking a few weeks ahead is sufficient for summer dates. Pricing runs $4 to $34 per night — building your trip around state parks with selective private-park nights for hookups is the best value strategy in Montana.

Private Parks (Direct Booking)#

For July and August, the popular parks — Yellowstone Grizzly, West Glacier KOA, Polson KOA — should be booked by March or April. Smaller parks tend to have more last-minute availability.

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Fuel, Supplies & Cell Signal#

Montana’s beauty comes with logistical gaps. Secondary roads through national forest can go 60-80 miles without a gas station. Top off in every town. Diesel is available at most stations but not all.

Resupply points: Bozeman is best (grocery stores, Costco in Belgrade). Kalispell near Flathead Lake has Costco and RV service. Polson has Safeway and Walmart. West Yellowstone covers basics at tourist-town prices only.

Dump stations: Most private parks have them. Inside Glacier, Fish Creek, Apgar, and St. Mary do; Many Glacier does not. No USFS campground in the Custer Gallatin has one.

Cell signal: Glacier NP is essentially a dead zone — the sole exception is St. Mary Campground on the east side. Flathead Lake towns have reliable service; state park campgrounds are spotty. Bozeman and West Yellowstone town have full coverage. Verizon consistently outperforms AT&T and T-Mobile in rural Montana.

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Bear Country: What RV Campers Need to Know#

Western Montana is grizzly and black bear country. This is not theoretical — bears regularly visit campgrounds throughout the Glacier and Yellowstone corridors. National park campgrounds enforce strict food storage regulations, and violations can result in fines.

For RV campers specifically:

• All food, coolers, and scented items must be stored inside your hard-sided RV or in bear-resistant containers when not in use. Leaving a cooler on your picnic table while you go hiking is a citation.
• Pop-up campers and soft-sided tent trailers are not considered bear-resistant. Some campgrounds restrict or prohibit them.
• Keep your RV windows closed when you are not at your site.
• Dispose of trash in bear-resistant dumpsters before nightfall. Do not leave bags outside your RV “until morning.”
• Carry bear spray when hiking. Keep it accessible, not buried in your pack. Know how to use it before you need it — practice drawing and aiming (with the safety on) so the motion is automatic.

Bears are a genuine safety consideration, not a campground decoration. Respect the regulations and you will have no problems. Ignore them and you risk a dangerous encounter that is entirely preventable.

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Dispersed Camping & Boondocking#

Montana has approximately 30 million acres of public land — roughly one-third of the state. Free dispersed camping is abundant if you know how to find it.

The basics: Dispersed camping on national forest land is free for up to 14 days. You must be self-contained — pack everything out. Obtain a Motor Vehicle Use Map (MVUM) from the nearest ranger station; GPS and Google Maps are not reliable for Montana forest roads. Check fire restrictions with the local ranger district before lighting any campfire.

Best areas along this route:

• Flathead National Forest between Glacier and Flathead Lake — dispersed sites along the Flathead River.
• Hyalite Canyon south of Bozeman — creekside sites, though they fill quickly on summer weekends.
• Gallatin Canyon on Highway 191 — forest roads branch into the Custer Gallatin National Forest.

Dispersed camping is a solid backup when reservations fall through and an excellent primary strategy if you want solitude no developed campground can match.

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Sample Itinerary: 12 Days, Glacier to Yellowstone#

This is a realistic framework — adjust it to your pace and interests.

Days 1-3: Glacier National Park Base at Fish Creek or Apgar (dry camping inside the park) or West Glacier KOA (full hookups outside). Drive Going-to-the-Sun Road, hike the Highline Trail, spend an evening on the Lake McDonald shoreline. If you have a second vehicle or a rig under 21 feet, explore Many Glacier on the east side for the best hiking in the park.

Days 4-5: Flathead Lake Drive south to Bigfork or Polson. Camp at Wayfarers State Park, Finley Point, or the Polson KOA. Kayak the lake, fish for lake trout, visit cherry orchards if it is mid-July to mid-August. Resupply in Kalispell or Polson. This is your decompression stop — slower pace, lower crowds, beautiful water.

Days 6-7: Bozeman Drive I-90 east to Bozeman. Camp at Bear Canyon or Bozeman Hot Springs. Explore downtown Bozeman — the restaurant scene here punches well above the town’s weight class. If you want a forest break, day-trip to Hyalite Canyon for hiking along Hyalite Creek (Yellowstone cutthroat and Arctic grayling if you carry a rod).

Days 8-9: Gallatin Canyon Transit Take Highway 191 south through Gallatin Canyon. Consider a night at Red Cliff Campground ($20-28/night, USFS) halfway between Bozeman and West Yellowstone. The Gallatin River alongside the road is blue-ribbon trout water. Continue to West Yellowstone.

Days 10-12: West Yellowstone & Yellowstone Base at Yellowstone Grizzly RV Park or another full-hookup park in town. Spend two or three full days in the park — Old Faithful and the geyser basins on day one, Grand Prismatic and Midway Geyser Basin on day two, Lamar Valley wildlife viewing on day three if you are willing to drive the northern loop.

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Quick Reference#

Detail	Info
Best months	Late June – early September
Route distance	~500 miles (Glacier to West Yellowstone)
Recommended trip length	10-14 days
Max rig for Glacier NP	21 ft towed on GTSR; 25-30 ft in campgrounds
Max rig for West Yellowstone	80 ft at Yellowstone Grizzly RV Park
Glacier reservations	Recreation.gov, 6-month rolling window
State park reservations	ReserveAmerica, a few weeks in advance
Nightly cost range	$4 (state park) to $167 (West Glacier KOA peak)
Best cell carrier	Verizon (rural Montana)
Bear spray	Yes. Carry it. Always.

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Final Advice#

Plan around what you cannot change — the short season, the rig size limits at Glacier, the reservation windows — and stay flexible on everything else. Book Glacier campgrounds the day the window opens. Reserve West Yellowstone parks by spring. Then leave two or three nights unbooked so you can follow the road where it takes you — a hot springs soak in Bozeman, an extra day on Flathead Lake when the weather is too perfect to leave, a boondocking night on a forest road where the only sound is the river.

That is how Montana works best. Not as a checklist, but as a corridor you move through slowly enough to notice what you are passing through.