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Welcome from the Hardin KOA!

Come see all we have done in our first 3 years. Many upgrades, including a 24-hr laundry, 2 huge dog parks, a dog wash and a mining sluice.
We have an 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 (5/15 - 11/15)
  • Propane ($)
  • Firewood ($)
  • Pavilion
  • Dog Park
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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 10-11, 2027

WHAT: KOA Rewards holders stay as a paying guest on Friday, September 10th at any participating KOA campground and get Saturday, September 11th 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.

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KOA Blog: Latest Stories
  • The U.S. Just Got Its 64th National Park

    National parks stand as one of the United States’ greatest treasures, preserving incredible natural beauty and delicate ecosystems for the benefit and enjoyment of the public. Now, we have another: Chiricahua National Park! Located in southeastern Arizona near the border with New Mexico, it’s easy to see why Chiricahua has become our 64th national park. […]

  • The Best Gifts for Campers and Travelers Under $30

    With the holiday season fast approaching, many of us find ourselves with a gift-giving list that’s just a little too big for our bank account. Suddenly, that budget you set aside looks smaller by the minute. But don’t worry – we’ve rounded up 16 of the best gifts under $30 for campers and travelers. So […]

  • Pumpkin Dump Cake Recipe

    This easy pumpkin dump cake brings all the flavors of fall together in a snap! Bake this fun treat on the grill or pop it in the oven at home. Pumpkin Dump Cake Recipe Ingredients: 1 (15 oz) can pumpkin puree ¾ cup evaporated milk 2 eggs – ¼ cup brown sugar ¼ cup white […]

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Local Area

Yellowtail Dam and Big Horn Lake and Reservior

Yellowtail Dam is a 525-foot-tall concrete thin-arch dam on the Bighorn River in Fort Smith. Constructed between 1961 and 1967, it spans 1,480 ft along its crest at an elevation of 3,660 feet. Named after Robert Yellowtail, a prominent Crow tribal leader. The dam forms Bighorn Lake, a 70 mile-long reservoir extending into Wy. Bighorn Lake created in 1965 by the construction of the dam on the Bighorn River.

20 US Hwy 14A

Lovell, WY 59035

307-548-5406

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

The Little Bighorn Battlefield National Monument preserves the site of the June 25–26, 1876, Battle of the Little Bighorn (also known as the Battle of the Greasy Grass). Located within the Crow Indian Reservation in southeastern Montana, this solemn park memorializes the conflict between the U.S. Army's 7th Cavalry, led by Lt. Col. George A. Custer, and the combined Lakota Sioux, Northern Cheyenne, and Arapaho forces under the spiritual guidance of Sitting Bull. It stands as one of the few battlefields in the world to feature distinctive markers honoring combatants from both.

I-90 Frontage Road

Crow Agency,, MT 59022

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Pompey's Pillar National Monument

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.

3039 US Highway 312

Pompeys Pillar, MT 59064

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Pictograph Caves

Pictograph Cave State Park is a premier National Historic Landmark located just 7 miles southeast of Billings, Montana. Spanning 23 acres along striking 200-foot sandstone rimrock cliffs, it serves as one of the Northern Plains' most critical archaeological sites. The park protects three distinct caves—Pictograph, Middle, and Ghost Caves—which provided shelter to generations of prehistoric hunters spanning over 3,000 years of continuous human habitation. Excavated heavily starting in 1937, the site yielded over 30,000 artifacts. These included stone tools, jewelry, and ancient weapons that have helped researchers trace the complex lineage of Indigenous peoples on the plains.

3401 Coburn Road

Billings, MT 59101

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