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North Fork 50
UltraUnited StatesColorado

North Fork 50 2027

22.05.2027Buffalo Creek (United States)
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2 courses · 50–80.5 km31.1–50 mi · up to 1’958 m D+up to 6’424 ft D+

At a glance

North Fork 50 2027 takes place on Saturday 22 May 2027 in Buffalo Creek (Colorado, United States). Two distances to choose from: 50 and 80.5 km.

Longest course: 80.5 km with 1’958 m D+ (24 m per km: hilly terrain). It has 8 aid stations. Terrain: 91% trail, 2% forest track and 7% road. Terrain data: © OpenStreetMap contributors.

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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…
From the organiser

2 courses

  1. 50km31.1mi

    1’119 m D+3’671 ft D+

    1’074 m D-3’524 ft D-

    avg 2%

    50 km

    30.05. · 5 aid stations

    No index
    GPX

  2. 80.5km50mi

    1’958 m D+6’424 ft D+

    1’849 m D-6’066 ft D-

    avg 2%

    80.5 km

    30.05. · 8 aid stations

    No index
    GPX

Course analysis

80.5 km50 mi1’958 m D+6’424 ft D+

100effort kmⓘ80.5 km on the map · feels like 100 km50 mi on the map · feels like 100 km
D+
1’958 m6’424 ft
D−
1’849 m6’066 ft
Max alt.
2’599 m8’527 ft
Steepest
7%

Segments

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Elevation profile: 80.5 km

2’039 m – 2’599 m6’690 ft – 8’527 ft

Terrain

Aid station by aid station

Terrain, climb and cutoff between each aid station.

  1. Start → Colorado Trail Aid km 0 → 7.7km 0 → 4.8

    7.7 km4.8 mi · +322 m1’056 ft · −9 m30 ft

  2. Colorado Trail Aid → Kelsey Campground Aid km 7.7 → 18km 4.8 → 11.2

    10.3 km6.4 mi · +244 m801 ft · −140 m459 ft

  3. Kelsey Campground Aid → Shinglemill Aid km 18 → 27.5km 11.2 → 17.1

    9.5 km5.9 mi · +200 m656 ft · −312 m1’024 ft

  4. Shinglemill Aid → Tramway Aid km 27.5 → 36km 17.1 → 22.3

    8.5 km5.3 mi · +117 m384 ft · −211 m692 ft

  5. Tramway Aid → Buffalo Aid km 36 → 45.3km 22.3 → 28.2

    9.4 km5.8 mi · +242 m794 ft · −249 m817 ft

  6. Buffalo Aid → Rolling Creek Aid km 45.3 → 52.8km 28.2 → 32.8

    7.4 km4.6 mi · +348 m1’142 ft · −73 m240 ft

  7. Rolling Creek Aid → Buffalo Aid km 52.8 → 60.1km 32.8 → 37.4

    7.4 km4.6 mi · +71 m233 ft · −342 m1’122 ft

  8. Buffalo Aid → Homestead Aid km 60.1 → 68.5km 37.4 → 42.6

    8.4 km5.2 mi · +246 m807 ft · −136 m446 ft

Elevation figures are measured by Kliva on the course trace. Cutoffs are the organiser's.

Race plan

Plan your race from start to finish.

Pacing, aid stations and fueling timed to your effort on North Fork 50, in one roadbook.

Includes this race's official aid stations and cutoff times.

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Where to stay

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