Sam Stowe campground is open year round. It Has 7 full hookup site available contact the park for more information. All water has now been turned off and bathrooms have been closed in both campgrounds. Castle Rock campground has 30 RV/Tent sites and is now closed for the winter; it will be reopened in the spring, weather allowing. The visitor center/museum is open Monday through Saturday from 9 a.m. to 5 p.m. Come visit our new exhibits and museum layout!