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IronHike Endurance Series

Cornwall, United States • 2-5 Oct 2025

Event overview

The IronHike Endurance Series takes place in Cornwall, Connecticut, at Mohawk Mountain Ski Area from October 2 to October 5, 2025. The series is organized by IronHike Endurance Productions LLC, a US military veteran-owned business. Events use a FlexRelay format that allows solo entries or teams: Individual (solo), Trail Buddy (team of 2), or Trail Family (team of 3 or 4). Participants self-manage pacing, rest, hydration, and sleep. Some events require night trekking by headlamp. The series states it is not a race: there are no podiums, no records, and no age group awards.

Distances and included services

  • Kuwohi - 15 miles, 7,140' elevation, 12-hour
  • Double Kuwohi - 28+ miles, 13,685' elevation, 24-hour
  • Denali - 43+ miles, 20,825' elevation, 48-hour
  • Everest - 61+ miles, 29,155' elevation, 72-hour
  • Olympus Mons Ultra - 152+ miles, 72,590' elevation, 84-hour
  • Answer the Bell Ultra - Full - 100+ miles, 50,400' elevation, 84-hour
  • Answer the Bell Ultra - Basic - 28.8 miles, 14,400' elevation, 24-hour

Registration includes tenting space for participants and up to six spectators at no extra charge, base area pop-up staging and support station, custom training plans by Chaski Endurance Collective, personalized bibs and finisher items, ski patrol medical support, and free parking and restrooms. Visit the organization's website for the most recent information.

United States Connecticut Cornwall

Race information

Registration
152 mi
72590 m+
Olympus Mons Ultra - 152+ Miles | 72,590' Elevation | 84-Hour
100 mi
50400 m+
Answer the Bell Ultra - Full - 100+ Miles | 50,400' Elevation | 84-Hour
61 mi
29155 m+
Everest - 61+ Miles | 29,155' Elevation | 72-Hour
43 mi
20825 m+
Denali - 43+ Miles | 20,825' Elevation | 48-Hour
29 mi
14400 m+
Answer the Bell Ultra - Basic - 28.8 Miles | 14,400' Elevation | 24 Hour
28 mi
13685 m+
Double Kuwohi - 28+ Miles | 13,685' Elevation | 24-Hour
15 mi
7140 m+
Kuwohi - 15 Miles | 7,140' Elevation | 12-Hour
Visit the organization's website for the most recent information.
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