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Hardrock 100 cutoff calculator

Hardrock 100 is the hardest 100-mile race in the world by reputation, with 165 km and over 10,000 m of vertical, averaging 11,000 ft of elevation. This calculator projects your ETA at all 15 aid stations and the 7 enforced cutoffs.

165.0 km · Silverton, Colorado, USA (San Juan Mountains)
10,118 m elevation gain
48h00 total cutoff

This calculator spreads your target time evenly. To see when real finishers actually reached each aid station, open Hardrock 100 by the numbers.

Course loaded
Hardrock Hundred Mile Endurance Run
165.0 km · 7 cutoffs before the finish · race cutoff 48:00:00

Defaults to the race cutoff. Set a faster goal to see your buffer at every aid station.

Want a course-aware ETA instead? Try the predictor →

ETAs use a linear pace projection from your target finish time. That is useful for cutoff planning but does not account for where the elevation gain sits on the course.

Why Hardrock 100 is hard

What the GPX doesn't tell you

  • More than 10,000 m of vertical gain. Hardrock crosses 13 mountain passes and peaks at Handies Peak (14,045 ft).

  • Altitude. Most aid stations are above 10,000 ft. Sea-level fitness does not transfer one-to-one up here.

  • Two nights of running. Even fast finishers cross into Saturday night, then Sunday morning. Sleep deprivation compounds altitude.

Cutoff history

Hardrock has fewer enforced cutoffs than most 100-milers (7 enforced + finish out of 15 stations), but the cutoffs themselves are tight because the terrain is unforgiving. Direction alternates yearly, and the data here is counter-clockwise. The Ouray cutoff (km 94, 27h) is often the make-or-break point: if you arrive there with less than an hour of buffer, the steep climb to Kroger's at 13,000 ft will catch you.

The crux

The sections that decide the race

Animas Forks (km 72) to Ouray (km 94). The descent into Ouray is brutal on quads, and the subsequent climb to Kroger's at the highest aid station of the course will determine whether you finish.

Pacing the cutoffs

Advice for Hardrock 100

01

Acclimatise to the altitude for a week before the race. There is no substitute. The model cannot predict your altitude tolerance from a sea-level race result.

02

Aim for the Telluride cutoff (km 120, 34h) with at least 90 minutes of buffer. The final 45 km includes Putnam climb and a steep descent into Silverton.

03

Sleep early if you can. Even 20 minutes at Ouray pays back later. Most DNFs in Hardrock are from collapse, not cutoffs.

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