Kartchner Caverns State Park

Kartchner Caverns State Park lies about 9 miles south of Benson, Arizona, and is best known for its show cave with 2.4 miles of decorated passages. Above ground, the park is also a certified International Dark Sky Park, giving visitors a second reason to stay after the sun goes down.

Why Kartchner Caverns State Park is a top stargazing spot

DarkSky International designated Kartchner Caverns an International Dark Sky Park in 2017, making it the second Arizona state park to earn the distinction after Oracle State Park in 2014, and awarded it Silver-tier status, corresponding to Bortle class 3 to 4 skies. The park has also received DarkSky's "One Star at a Time" award for its lighting stewardship. The adjacent Whetstone Mountains act as a natural shield, blocking light spillover from the Tucson metro area to the northwest.

What you can see

Southern Arizona's dry desert air and the park's rural setting away from major cities make for clear views of the stars once the show caves close for the day. On a clear night the Milky Way and a rich field of stars are visible above the surrounding desert landscape near the San Pedro River.

Visiting Kartchner Caverns State Park at night

Entrance costs $10 per vehicle for a single occupant, $20 for a vehicle with two to four people, or $5 for an individual arriving on foot or by bicycle. The park has hosted regular star parties since 2010 in partnership with volunteers from the Huachuca Astronomy Club, held at no extra cost beyond regular park admission. Check the Arizona State Parks website for current hours and the star party schedule before you visit, since these can change with the seasons. As with any dark-sky site, a clear night near the new Moon offers the best conditions, and a red-light torch will help you find your way without ruining your night vision.

Best time to go

At Kartchner's latitude the Milky Way core is visible from around March to September and climbs high in the summer sky. Winter nights are longer and often crisper in the desert air, good for picking out Orion and the other winter constellations once the caverns close. The Perseid meteor shower in August and the Geminids in December are both worth timing a visit around, and southern Arizona's clear, dry climate gives good odds of a cloudless night in either season. Whatever the timing, aim for the days around new Moon, and let your eyes adjust to the dark for 20 to 30 minutes before you expect to see fainter stars.

Getting there

The park is about 9 miles south of Benson off State Route 90, roughly an hour's drive southeast of Tucson, with the San Pedro River running nearby to the east.

See your named star from here

After exploring the caverns, look up: Kartchner's certified dark sky is a fitting place to search for a star you've named through star-register.eu. Bring your certificate's coordinates and a stargazing app to help you find it overhead. Browse the catalogue of named stars, or discover more certified dark-sky destinations on our observatories page.