The Hardrock 100 is run in the San Juan Mountains around Silverton, Colorado. The loop connects old mining settlements over high passes, crossing scree, lingering snowfields and mountain streams. Average altitude sits near 3,350 m, and that single fact shapes every decision made during the race.
Hardrock Hundred Mile Endurance Run
The Hardrock 100 is run in the San Juan Mountains around Silverton, Colorado.
Prepare for Hardrock 100 in
A plan built from your answers and your race date.
The formats
One format only.
| Format | Distance | Vertical gain |
|---|---|---|
| Hardrock 100 (101,8 miles) | 101.8 mi | 10,193 m |
Organizer information, checked on September 21, 2026 · hardrock100.com
When to start
A build for this distance usually runs 12 to 24 weeks. Counted back from race day, that puts the start somewhere between January 18, 2027 and April 12, 2027.
These ranges are working conventions, not a research finding — no trial has compared plan lengths against each other. What matters more is that the plan was built for the weeks you actually have, rather than shrunk down from a longer one.
When to start
January 18, 2027
→ April 12, 2027
Worth reading before you enter
Races and distances
Trail distances: what changes off the road
Distance stops being the useful number. What decides a trail race is how long you are out, how much you climb, and how much the descents have wrecked your legs by the end.
Read
Training
Eating and drinking: what’s proven, what isn’t
This is where confident advice most often runs ahead of the evidence. Some of it is well tested. Some is opinion wearing a number. And one common habit can kill you.
Read
Races and distances
When to start preparing your race
Most plans fail before the first session, because the block started too late and everything had to be squeezed. Counting back from the date is the dullest and most useful thing you will do.
Read
Questions
What is the date of Hardrock Hundred Mile Endurance Run in 2027?
Hardrock Hundred Mile Endurance Run is run on Friday, July 9, 2027 in Silverton. Date published by the organizer, checked on September 21, 2026.
How do I enter the Hardrock 100?
Qualifying standards and participation requirements are published on the official Hardrock race website.
How much climbing is in the Hardrock 100?
8 km with 10,193 m of vertical gain, at an average altitude of roughly 3,350 m in the San Juan Mountains. It is one of the most demanding profiles in ultrarunning.
Other races
This list keeps growing; it draws no line. A race that is missing is prepared for in exactly the same way.
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HOKA Bandera Endurance Trail Race
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The HOKA Bandera Endurance Trail Race is a trail and ultra weekend held in Bandera, Texas, inside the Hil
Moab · United StatesUltra
Moab 240 Endurance Run
January
7 km ultramarathon with 9,620 m of vertical gain, run as one continuous loop out of Moab, Utah. It is par
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