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Groups & Retreats at Yellowstone Park - Mountainside KOA Journey

Gather your group for an unforgettable adventure at Yellowstone Park / Mountainside KOA Journey, a true base camp nestled in the Gallatin National Forest, just 7.5 miles from Yellowstone’s West Entrance. Whether you’re planning a family reunion, RV rally, church retreat, or friends’ getaway, we offer 68 RV sites, 12 Deluxe Cabins, and 43 tent sites surrounded by Montana wilderness. With a Covered Pavilion, on-site pizza, nature trail access, and Yellowstone around the corner, your group will have everything it needs for a stay worth remembering.Email us at [email protected] or call us at  1-406-646-7662 to inquire about a group stay and reserve!


 Property Sites:


Group Friendly Features:
  • Covered Pavilion: Seats up to 40, perfect for group meals, meetings, and celebrations
  • Lodgepole Pizza: Made-to-order pizzas and hearty entrees on-site, a group favorite for easy, delicious meals
  • General Store: Camping essentials, snacks, beverages, and Montana-themed souvenirs
  • Bike Rentals: Explore the campground and surrounding mountain scenery
  • Laundry Facility: Convenient for multi-night group stays
  • Nature Trails: Direct access to the Gallatin National Forest
  • KampK9® Dog Park: For groups traveling with pets
  • Horseshoes, Volleyball & Playground: On-site recreation for all ages

Groups That Love Camping Here:
  • RV Rallies & Camping Clubs: Pull-thru RV sites with 50-amp service and a mountain forest setting make Mountainside KOA a natural rally stop on the way to Yellowstone.
  • Family Reunions: RV sites, Deluxe Cabins, and tent sites give every family member a place to call home base while Yellowstone’s wonders are just down the road.
  • Church & Faith-Based Retreats: Montana’s mountain forests and the boundless grandeur of Yellowstone create a deeply inspiring setting for fellowship, worship, and reflection.
  • Corporate & Team-Building Retreats: The Covered Pavilion, Lodgepole Pizza, Gallatin Forest Trails, and Yellowstone day trips make for a team experience that no conference room can match.
  • Scout Troops & Youth Groups: Nature trails, wildlife, geysers, and on-site outdoor activities turn a stay at Mountainside KOA into a bucket-list adventure for scouts and young explorers.
  • Friends’ Gatherings & Celebrations: Campfire nights under a Montana sky, pizza at Lodgepole, and a morning drive into Yellowstone, the kind of trip your group will talk about for years.

Things To Do On-Site & In the Local Area:

  • On-Site: Lodgepole Pizza for group dinners, made-to-order pizzas, and entrees served on-site
  • Rent bikes and explore the campground and the surrounding mountain scenery
  • Hike nature trails leading directly into the Gallatin National Forest
  • Play horseshoes, volleyball, or let kids loose on the playground
  • Gather under the Covered Pavilion for group meals, meetings, or evening celebrations
  • Pick up trail snacks and Montana souvenirs at the General Store
  • Let pets run free at the KampK9® dog park

  • Yellowstone National Park: West Entrance: Just 7.5 miles away, Old Faithful, Grand Prismatic Spring, Mammoth Hot Springs, wildlife, and the world’s largest concentration of geothermal features.
  • Gallatin National Forest Trails: Hike, mountain bike, or explore backcountry terrain right from the campground's doorstep.
  • Wildlife Viewing: Bison, elk, wolves, bears, and eagles roam the Greater Yellowstone Ecosystem, some of the best wildlife viewing in North America.
  • Grizzly & Wolf Discovery Center: Grizzly bears and gray wolves in naturalistic habitats in downtown West Yellowstone, educational and unforgettable for all ages.
  • West Yellowstone, Montana, Shops, Restaurants, the Giant Screen Theatre, Yellowstone Historic Center, and outfitters for fishing, horseback riding, and more.
  • Fly Fishing the Madison & Gallatin Rivers: World-class trout fishing with guided outfitters available in West Yellowstone.
  • Hiking & Scenic Trails From easy boardwalk geyser loops to multi-day backcountry routes, Yellowstone and the surrounding forests offer trails for every group.

Plan Your Stay:
  • At KOA, we consider 10 sites or more per night a group.
  • Email [email protected] or call 1-406-646-7662 for group rates, site proximity, and special requests.
  • Browse the campground map to view site locations.
  • Group reservations are available during open season. Reach out early; Yellowstone summer fills fast.
  • Book early to secure your RV sites, Deluxe Cabins, and tent sites together.

For group accommodations, including rally information, please call 1-406-646-7662.