April 4, 2026 · Raleigh, North Carolina, USA
100 mi (161 km)RunningUltra

Umstead 100 Mile Endurance Run

Loops. Spring Classic.

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Raleigh, North Carolina, USALoops. Spring Classic.
Course intelligence

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Terrain

Eight loops of a 12.5-mile trail through William B. Umstead State Park. Gentle forest trails with rolling hills, entirely on natural surfaces.

Conditions

Early April in North Carolina: 38–72°F. Can be warm by day, cold overnight. Spring rain is possible. Beautiful flowering dogwood.

Aid Stations

Full aid at the main Headquarters at each loop start/finish, plus two mid-loop stations. Crew access at HQ only.

Key Challenge

Eight loops of the same 12.5 miles creates the same GI monotony as any looped 100 but compounds it with 24+ hours of the exact same food choices at the exact same aid station.

Fueling questions

Nutrition answers for Umstead 100 Mile Endurance Run.

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