Best Keystone (SD) Hotels With 18+ Check-In (Updated January 2026)

Unleash your adventurous spirit in Keystone, South Dakota! Nestled amidst the rugged landscapes of the Black Hills, this vibrant town is a goldmine of thrilling escapades and rich history. Ideal for young travelers yearning for an offbeat and dynamic vacation, Keystone is packed with outdoor activities, from hiking scenic trails to exploring magnificent caves. And let's not forget its crowning glory - the iconic Mount Rushmore, which every globetrotter must tick off their bucket list. The town's robust Wild West history, intriguing museums, and lively bars add to its youthful charm. So, come and experience the captivating blend of nature, adventure, and history that is Keystone!

Below is a list of hotels and motels in Keystone that allow reservations for guests under 21, including those aged 18, 19, and 20. From cheap options to more adult-focused accommodations, there's a variety of places to rent that fit your needs and preferences!

Please note that hotel policies regarding the minimum check-in age in Keystone can change at any time. While we aim to keep our information updated, we recommend confirming the minimum age requirement with the hotel or motel before making a reservation.