The Mount Wilson Observatory dome glowing under a starry sky above the lights of Los Angeles

Angeles National Forest · Coming 2027

Mount Wilson 50 Mile

Start at midnight. Climb through the dark to the observatory. Run back down with the sunrise.

A pack donkey with a wooden packsaddle at a rustic canyon pack station at dusk

Start & Finish

Chantry Flat

Toe the line at Adams Pack Station, the historic home of the pack trains that still haul supplies into Big Santa Anita Canyon by donkey.

The 100-inch Hooker telescope inside its dome, pointed at a strip of stars

The Summit

Mount Wilson Observatory

Climb to the home of the 100-inch Hooker telescope, where astronomers first saw that the universe is expanding. You get there in the dark, under the same stars.

Date
Saturday, August 28, 2027
Start
12:00 a.m. midnight
Friday night into Saturday
Start & Finish
Chantry Flat
Adams Pack Station
Distance
50 miles

Registration, course map, and cutoffs are coming soon.