Middle Fork River Forest Preserve opens at 7 AM year-round, weather-permitting.
Although some portions of the Middle Fork River Forest Preserve close to automobiles at dusk, the North Waterfowl Management Area is open 24 hours a day for night sky viewing. The entrance and parking for the waterfowl area are located 2554 County Road 3500 North.
What you'll see in the summer sky
First & Only Dark Sky Park in Illinois (video)
Closing times vary: