Glacier National Park: Bike or hike the iconic Going-to-the-Sun Road before it fully opens to cars.

Wildlife Viewing: Spot newborn animals and migrating birds, especially in Yellowstone and other parks.

Hiking & Biking: Explore lower elevation trails and prairies as they dry out; mountain biking is great.

Whitewater Rafting: Experience thrilling Class II-III rapids on rivers like the Middle Fork of the Flathead, usually starting in May.

Spring Skiing: Enjoy soft snow and resort events at places like Big Sky Resort, often until late April.

Hot Springs: Relax in natural hot springs as temperatures rise.