Clark Open House




Most evenings from 4pm to close


Included with General Admission

Of the many telescope domes found on Lowell Observatory’s central Flagstaff campus, the most prolific and recognizable is the Clark Dome.

During open house hours at the Clark Dome, you can get an up-close look at the world famous 24″ Clark Refractor, take photos, and hear a bit about the history of the storied telescope and its dome. Weather permitting, you can even take a peek through the very telescope Percival Lowell peered through 125 years ago.

Learn more about the historic 24" Clark Refractor

COVID-19 and General Admission

Test negative* for COVID-19 within 72 hours of visit.
(Ages 12+)
*Lab tests only.

Vaccination accepted in lieu of negative test.
(Ages 12+)

Young children wear masks when indoors.
(Ages 2-11)

Negative test not required for young children.
(Ages 2-11)

Phase 3A

General Admission is back, with new protocols to keep guests and staff safe from COVID-19. We will move to Phase 3B—unrestricted General Admission—as soon as the level of community spread permits it.

See our reopening plan.