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 (and 50K)

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

Full moon weekend

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, July 17, 2027
Full moon weekend
Start
12:00 a.m. midnight
Friday night into Saturday
Start & Finish
Chantry Flat
Adams Pack Station
Distance
50 miles
and 50K

Registration, course map, and cutoffs are coming soon.