Pennsylvania has one certified International Dark Sky Park. One. But it happens to be one of the most significant dark sky sites in the entire country, and for anyone based in the northeastern United States it is the most important stargazing destination within reach.
Cherry Springs State Park — Bortle 2, Gold Tier
Cherry Springs was the second International Dark Sky Park ever certified in the world, designated by DarkSky International in 2008. The only site certified before it was Natural Bridges National Monument in Utah. It was also the first certified dark sky park in the eastern United States, a distinction it still holds nearly two decades later.
The park sits at 2,300 feet elevation on the Allegheny Plateau in Potter County, surrounded by 262,000 acres of Susquehannock State Forest. That buffer is what makes the skies possible. Nearby communities sit in valleys below the ridgetop, which keeps their light from reaching the observing field. The result is a Bortle 2 sky that is genuinely difficult to believe if you are used to anything east of the Appalachians.
The 82-acre Astronomy Field is the heart of the park. It offers a full 360-degree unobstructed horizon with no mountains or tree lines cutting into the sky, which is exceptionally rare in the eastern US. Under optimal conditions, 10,000 stars are visible to the naked eye and the Milky Way is bright enough to cast a faint shadow on the ground. The park manages every detail for darkness: all lights are shielded and red-tinted, electrical lines are buried underground, earthen berms block vehicle headlights from reaching the field, and a light-blocking tarp covers the gate.
Cherry Springs hosts two major annual star parties that draw hundreds of astronomers from across the country. The Cherry Springs Star Party runs in June, organized by the Astronomical Society of Harrisburg. The Black Forest Star Party follows in September, organized by Central Pennsylvania Observers. Both events have waitlists. If you want to go during a star party weekend, plan months ahead.
Outside of star party season, the park sees roughly 60 to 85 nights per year with ideal viewing conditions. Fall is the best window, typically September through October, when humidity drops after summer, skies stabilize, and the summer Milky Way core is still visible in the early evening before setting in the west. Winter skies at Cherry Springs are crystal clear but temperatures on the exposed ridgetop drop hard after sunset, often into the teens by midnight.
Getting There
Cherry Springs is not convenient from anywhere, which is part of why it is still dark. Coudersport is the nearest town, about 10 miles away. From Philadelphia it is roughly 4.5 hours. From New York City, about 5 hours. From Pittsburgh, about 3 hours. There is a small campground adjacent to the Astronomy Field with tent sites and a few cabins, and reservations fill quickly on new moon weekends from spring through fall. Book early.
The remoteness is the point. If you are within driving distance of Cherry Springs and have never been, it should be on your list.