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Welcome from the Hardin KOA!

Come see all we have done in our first year, Many upgrades including 24 hr laundry and a dog wash.
We have a after hours, night registration box. 
Office # (406) 665-1635.
Office hours 8 am to 8 pm MST
After hours # 971-322-3239

The Hardin KOA is halfway between Yellowstone National Park and Mt. Rushmore. Come and stay with us and enjoy all that our area has to offer. You'll be glad you did!

Jon & Kristy Mastin

Campground Amenities

  • 50 Max Amp
  • 80' Max Length
  • Wi-Fi
  • Pool (5/29 - 9/4)
  • Propane ($)
  • Firewood ($)
  • Pavilion
  • Dog Park
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Ways to Stay

RV Sites
Lodging
Tent Sites
Extended Stays
Groups

What Others Are Saying

Overall Camper Rating:

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Campground Recreation

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KOA Journey

KOA Journey Campgrounds

KOA Journey campgrounds offer the perfect oasis after a day on the road. Whether it’s along the way or a quick getaway, they’ve got you covered. Located near the highways and byways of North America with long Pull-thru RV Sites, they deliver convenience to the traveling camper. Pull in, ease back and take a load off.

KOA Journeys Feature:

  • Pull-through RV Sites with 50-amp service
  • Premium Tent Sites
  • Well lit after hours check-in service

Latest Hot Deal

KOA Rewards Appreciation Weekend

KOA Rewards Appreciation Weekend Photo

WHEN: September 5-6, 2025

WHAT: KOA Rewards holders stay as a paying guest on Friday, September 5th at any participating KOA campground and get Saturday, September 6th for FREE*.

WHY: KOA Rewards Appreciation Weekend is designed exclusively for KOA Rewards holders to say thanks for your loyalty and for trusting your camping memories to us. On this late-summer weekend, we gather to celebrate friends, family and fun in the great outdoors we all adore.

* Only at participating KOA locations. Applies to one site per a KOA Rewards account, for two consecutive nights at the same KOA. Sites may be limited. KOA Rewards discount does apply but not valid with other discounts.

Book This Hot Deal

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KOA Blog: Latest Stories
  • Full Dinner on a Stick

    A little pre-prep and this 3 course meal lets everyone take a hand at cooking! Full Dinner on a Stick Ingredients 1 (10-ounce) pkg mini marshmallows 6 cups crisp rice cereal ½ cup mini chocolate chips, frozen 1 package refrigerated crescent rolls (8-count) Mustard of choice Dill pickle spears 1 package hot dogs 8 ears […]

  • Top 10 Reasons to Add a Night to Your KOA Camping Trip

    Sometimes the best thing you can do for your camping trip is simply slow it down. Whether you arrive a night early to ease into vacation mode or stay an extra night to avoid the checkout scramble, that one additional evening can completely change the pace—and the quality—of your getaway. It’s not just about squeezing […]

  • Campfire Puff Pastry

    Phyllo dough works like magic in a pie iron, yielding crispy, buttery pastry enfolding your favorite fillings! Campfire Puff Pastry Ingredients Cooking spray or softened butter 1 package frozen phyllo, thawed according to pack instructions 1 container whipped cream cheese Granulated sugar or honey 1 package of fresh raspberries, washed Peanut butter Bananas Mini marshmallows […]

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Local Area

Yellowtail Dam

The Yellowtail Dam is within an hours drive away. Beautiful scenery and wild animals can be seen along the way. Big Horn Canyon is a site to see!!! Don't miss the visitor center next to the Yellowtail Dam with all the information about the area. You can even drive to the marina and walk into the waters of the lake of Big Horn Canyon.  Check the internet for the latest update.

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Little Bighorn National Monument ("Custer's Last Stand")

During June the Reenactment of The Battle of Little Big Horn is and you can meet the actors after the show. Some actors stay right here at the Hardin KOA. How fun is that? Custer visited and had ice cream at our ice cream social.

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Pompey's Pillar

Pompey's Pillar is less than 45 minutes away. Pompey's Pillar is a National Monument that rises 150 feet from a 2 acre base on the banks of the Yellowstone River. Captain William Clark of the Lewis and Clark Expedition, arrived at Pompey's Pillar on July 25, 1806, on his return trip from the Pacific. Clark marked his visit by engraving his name and date of his arrival. Clark named this rock Pompey's Tower and it was renamed Pompey's Pillar in 1814 when the Lewis and Clark journals were published.

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The Farmer's Daughter General Store

Home Decor. Antiques, Gifts, Souvenirs, Scrapbooking, Boutique, and Soda Fountain.  Owner Landa Uffelman.
She is located downtown Hardin.  206 N. Center Ave.  406 665 2078.
The store is so unique and a big positive addition to Hardin.  It is in the original structure of the Fort Custer General Store, owned by her Grandmother and Grandfather.  Harvey and Charlene Warren.
Don't forget to buy Papa Harvey's seasoning.  I also sell it in my store here at Hardin KOA.

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More Local Area Information

Campground Blog