Newcomb saddle TO RED BOX

MILES 63.5 - 72.4

Section Distance

2026 COURSE NOTICE: The detailed section description below is legacy course information and does not reflect the 2026 route, direction, or mileage. The 2026 race starts and finishes at Loma Alta Park in Altadena on a 100.8-mile out-and-back course to Mt Hillyer. See the 2026 Full Course page and 2026 checkpoint table for current information.

2019 AC100 RedBox Aid Station. Photo: John Chin

Section Length: 8.9 miles
Driving Distance: 5.0 miles / 9 minutes
Checkpoint: Red Box
Drop Bags: YES
Crew: YES
Pacer: YES
2017-2019 Aid Station Leader: Larry Rich/John Chin
2022 Aid Station Leader: Zac Carter
2024 Aid Station Leader: Adan & Ana Benitez
Maps by Marcus England
Course Description by Katie Grossman

COURSE DESCRIPTION

Runners head west on Red Box Rincon Rd, descending 1000’ in 3 miles to West Fork Trail Camp. From there, they climb 1600’ in 6 miles to the Red Box Aid Station at mile 72.4. This segment stays on the dirt road the entire way to Red Box. Do not take the single track.. yet. You’ll hit it on the next section from Red Box to Mt. Wilson.

GAIN

1 '

LOSS

1 '

HIGH POINT

1 '

LOW POINT

1 '

Newcomb saddle TO RED BOX​

MILES 63.5 - 72.4

Section Distance

COURSE DESCRIPTION

Newcomb saddle TO RED BOX