All Museums Open

All Museums Open – May 15, 2026: 9 AM - 5 PM

Join us for Opening Day at the Old Montana Prison Complex, when all five attractions open for the season on May 15, 2026. Explore the historic Old Montana Prison, discover over 200 beautifully restored vehicles at the Montana Auto Collection, and revisit childhood memories at Yesterday’s Playthings, our doll and toy museum. Step into the Old West at Frontier Montana, and learn about the people, places, and stories that shaped the region at the Powell County Museums. With every attraction open, it’s the perfect day to experience Montana history, culture, and fun—all in one place.