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Saturday - May 31, 2025

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2024 Race Guide
https://www.aravaiparunning.com/bear-chase-series/

North Fork 50

50 Mile | 50K

Buffalo Creek, CO

The North Fork 50 Mile/50K is a gem of an ultramarathon in the Colorado mountains just southwest of Denver. The course is 100% soft surface, made up almost entirely of incredible singletrack trails with a few short sections of double track road. 

Climb through open burn areas from a 1996 fire, then dive back into the beautiful ponderosa pines and wind around towering granite rock formations as you excite your senses and challenge your mettle. 

A portion of race proceeds goes to the North Fork Volunteer Fire Department, which supports and serves the local community.

*Distances may vary slightly each year due to permitting.

Start Times

Saturday, May 31
50 Mile  - 6:00 am
50K - 7:00 am

Bib Pickup

Buffalo Creek Clubhouse
18050 S Buffalo Creek Rd
Buffalo Creek, CO 80470

Saturday, May 31

5:00 am - 7:00 am

Volunteer

We need help to make North Fork possible. Volunteer perks include Aravaipa race credits, race tee and food/drink at the finish line festival!
Volunteer Now

Bear Chase Race Series

North Fork Ultras is part of the Bear Chase Race Series. Take on some of the flowiest, butteriest, amazingest, and funnest singletrack in the region across four exciting events: Rock Hawk Trail Races, North Fork 50, Chase the Moon, and the Bear Chase.

Live Tracking

Follow the 2025 North Fork 50 with live split points throughout race weekend.
Aravaipa Live
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Registration closes: Mon, May 26 @ 11:59PM MT
Register Now

Race Registration

Until 12/16 Until 3/31 Until 5/26 Race Day
50 Mile $165 $180 $195 $210
50K $140 $155 $170 $180
Withdrawal Policy

Course Information

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Key Stats
Date | Saturday, May 31, 2025

Start Time | 6:00 am

Time Limit | 14 Hours (8 pm)

Distance | 50 Miles

Total Elevation Gain | 6,425 feet

Max Elevation | 8,535 feet

Women's Course Record | 8:30:21 - Elizabeth Gold (2017)

Men's Course Record | 7:17:58 - Michael Hewitt (2017)

Course Map
CalTopo Course  Map

50 Mile Event Details

North Fork 50 Video

Results & Photos


Thank you to our sponsors!

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