When you don't feel like driving 140 miles to Rocky Mountain National Park, Mueller State Park offers ... 5 a.m. and 10 p.m. every day. The visitor center is open from 9 a.m. to 4 p.m. daily.

10-11 a.m. At the visitor center Did you know that Mueller is applying to become a Dark Sky Park through DarkSky International? This is a long process. Find out why keeping our skies dark at night ...