The Corps of Discovery Trail Races
Typically 58–89°F · low rain risk
See last 10 years
On this date: rain 0 of the last 10 years
2026
61–98°F
dry
2025
53–86°F
dry
2024
62–99°F
dry
2023
63–93°F
dry
2022
58–85°F
dry
2021
59–91°F
dry
2020
57–86°F
dry
2019
61–90°F
dry
2018
55–87°F
dry
2017
61–92°F
dry
Best months to race in Montana →
About this race
In late July 1805, the Lewis and Clark Expedition reached Three Forks in present-day Montana, where the Jefferson, Madison, and Gallatin rivers converge to form the Missouri River.
Join us in celebrating this wonderful day with a 5K or 10K trail run in the beautiful Missouri Headwaters State Park, near the confluence of the Madison, Gallatin, and Jefferson rivers.
This event is a part of the Montana Trail Series.
Course map
Train with a club
Run clubs near Three Forks to train with before race day.
See all run clubs near Three Forks →Suggested Races
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