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Come see all we have done in our first 2 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
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.
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 DealRV travel is definitely about adventure and fun – but it should also be about rest and rejuvenation. Sleep seems like the simplest thing in the world, until it’s not. Whether you’re on the road for a weekend or a lengthy cross-country road trip, getting a good night’s sleep in your home on wheels is essential. […]
This gorgeous appetizer is fun way to make the most of seasonal berries! The mocktail is tasty as-is, or you can add a splash of rum or vodka. Brie Ingredients 1 baguette Olive oil 1 small wheel brie or camembert 2 cups blackberries 1 tbsp balsamic vinegar Honey, for drizzling Fresh mint, for garnish Mocktail […]
Looking for the ultimate way to camp with your dog? Try a KOA Paw Pen which offers a private pet area. Here’s where you can find them across the U.S, and Canada.
That doesn't mean this area has to always be empty. When you start reviewing camping options, your history will display here to help compare sites and find the best stay. You will be able to share your stay information with friends or family and save it for a later time if you have a KOA Account.
Make checkout easy by booking all your reservations at once. Add your sites from different campgrounds into your shopping cart* and then choose checkout.