Gallery hours are 10 a.m.-4 p.m. Monday through Friday. The summit of Mauna Kea is one of the most remote locations in the Islands. Medical and auto help is a minimum of two hours away. Most car rental companies void the rental contract if their cars are driven on Saddle Road and to the summit. High winds on the summit can often result in blowing snow, sleet, fog and sometimes, flying rocks.
Caution is advised.
The Keck Observatory does not offer public tours but the University of Hawaii, Institute for Astronomy operates the Onizuka Visitor's Center at the 9,200-foot basecamp, where free programs are offered on Friday, Saturday, and Sunday every week of the year.