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Yellowstone Park / Mountainside KOA Journey

Welcome to the Yellowstone Park / Mountainside KOA

Yellowstone National Park is just 7.5 miles down the highway from this KOA. Old Faithful is 37 miles away. Along with the striking scenery of the rugged Continental Divide and stunning views into Yellowstone, you can soak up the natural beauty of the campground's meandering mountain streams, fishing ponds and grand old-growth lodgepole pine trees. Big rigs enjoy some of the area's longest and widest Pull-Thru RV Sites. Camping Cabins tuck right in among aspen and willow trees along the banks of Denny Creek. Hiking and four-wheeler trails lead off from the campground into Gallatin National Forest. Wildlife viewing - for moose, elk, bison and more - is excellent. Groups enjoy the indoor and outdoor pavilions. Max pull thru: 105 feet.

User Reviews

Travel With Rolando

December 20, 2025

⭐️⭐️⭐️⭐️⭐️ A Soul-Soothing Stay at Yellowstone Mountainside KOA — Calm, Comfort & Canine Joy After a full, exhilarating day exploring the wonders of Yellowstone National Park, pulling into Yellowstone Mountainside KOA felt like a deep exhale for the soul. The drive is short and easy, making this KOA a perfect home base—close enough to the park for convenience, yet far enough away to offer peace, quiet, and a chance to truly unwind. It was exactly the evening reprieve I needed to settle my spirit after a day of awe and adrenaline. The campground itself is beautifully maintained, with tidy sites, open views, and a calm mountain atmosphere that instantly slows your pace. The staff were gracious, welcoming, and genuinely kind, which makes such a difference after a long day on the road or in the park. Everything felt organized, cared for, and thoughtfully managed—one of those places where you can tell pride is taken in every detail. And Bella? She was thrilled. The great dog park was the perfect place for her to stretch her legs, burn off energy, and enjoy some well-earned playtime. Watching her run happily while the sun dipped behind the mountains made the evening feel complete. For travelers with dogs, this KOA truly understands how important pet-friendly amenities are to the overall experience. If you’re visiting Yellowstone and looking for a campground that offers comfort, kindness, and a calming end to an unforgettable day, Yellowstone Mountainside KOA is a wonderful choice. It’s the kind of place that gently steadies your heartbeat, lets you reflect on the day’s magic, and prepares you beautifully for whatever adventure comes next. 🚐⛰️🐾

Cayla Strahan

October 09, 2025

My husband and I stayed at this location for over a month while he worked in Big Sky, so that kinda makes me an expert! :) The location is so beautiful, and conveniently located so close to bars/restaurants, a small food market, and of course to the west entrance of Yellowstone NP. All the staff we encountered were very friendly and helpful. As travelers who move around for work, our schedule changes often and last minute, and we’re grateful for how understanding accommodating they were. Their facilities and amenities are very well kept. Overall, we enjoyed our stay immensely and would recommend other travelers check it out!

Kathleen Andersen (Sheepmom)

September 30, 2025

We stayed here for one night at the end of September. Our check in was very smooth and our site was great. Everything was very clean, it was easy to pull through and hook ups were great. The bathrooms are extremely clean and have good hot water for showers. The staff were so friendly and helpful. We can definitely recommend this great KOA.

Stephanie Koss

September 18, 2025

This was my first time at this establishment. I reserved ahead online with no problems. We stayed Tues, Wed and Thur night the first part of September. It was pretty full for the most part. We did get a tent site right by the creek which was awesome. It was a short walk to the bathroom/showers. They had a laundry room and a store though I never did get to go in. The campground was very neat, organized and the bathrooms were very clean and up-kept. I definitely recommend and would stay again.

Kevin D. Spencer (Rev.Kev)

August 25, 2025

The campground is well kept and everyone on staff has been very nice. If you need anything they are very accommodating..... I needed to get on top of the roof of my camper and within minutes one of the staff had a ladder here 💯 The bathroom/showers and laundry facilities are definitely a five-star. We ended up booking an extra week and stayed here 2 weeks. they have a couple of ponds out back that you can walk around and a really nice creek with bridges that you can sit on and listen to the water. We've seen deer, and moose walking across the top of the meadow outback. We have absolutely enjoyed our stay here at KOA

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