Hardrock 100
33,000ft of climbing at high altitude in the San Juans — arguably the hardest 100-miler in the US. What to consider for altitude, technical terrain, and self-sufficiency.
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Race conditions
Distance: 100 miles, San Juan Mountains, CO.
Elevation: ~33,000 ft climb / 33,000 ft descent. Average ~11,000 ft, max ~14,000 ft.
Cutoff: 48 hours.
Terrain: extremely technical and remote; direction alternates yearly (clockwise / counter-clockwise).
Known requirements (official)
- • Extensive mandatory gear (jacket, hat, gloves, space blanket, etc.)
- • Adequate hydration capacity for long, remote stretches
- • Headlamp + backup
- • Altitude acclimatization strongly recommended
Always confirm against the current official race manual, rules change year to year.
What to consider: what’s worked for others
Acclimatize before you toe the line
With miles above 12,000 ft, Hardrock punishes sea-level arrivals. Most successful finishers arrive 1–2 weeks early or train at altitude. Pace by effort, not by flat-land pace.
Technical footing demands lugged, protective shoes
Talus, scree, and steep descents dominate. Rock plates and aggressive lugs help; some carry microspikes for lingering snow depending on the year. Ankle protection matters.
Long, remote stretches — carry more, not less
Aid is sparse and the terrain is unforgiving. Carry capacity for the worst-case between stations and know the cutoff logic — Hardrock's clock runs differently than most 100s.
This curated section summarizes publicly available, legitimately sourced content, race-official requirements, finisher interviews, published gear lists, and race-report blogs. It is framed as “what to consider,” not as a statistic.
No field reports yet for Hardrock 100.
When finishers contribute, we’ll show counts here, never “X% recommend” claims until the sample is genuinely credible and disclosed.
Community field reports
Below are firsthand gear reports from runners who've toed the line. We publish counts, not 'X% recommend' claims, until the sample is credible.
No field reports yet for Hardrock 100
If you’ve run it, share what you carried and how it held up.
Race-day tips & hacks
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