The North Fork 50 Mile and 50K

The North Fork 50 Mile/50K is 100% trails, mainly single track and some double track, starting and finishing along lovely Buffalo Creek, in the mountains about 50 miles southwest of Denver.
This is a pure ultra, a very special and unique race, deliberately kept small so each runner gets personal attention.
There are no non-ultra distances and no crowds on the beautiful trails.

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https://www.northfork50.com/