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Ironhike Endurance Series - Spring

Cornwall, United States • 4-7 Jun 2026

Event Overview

The IronHike Endurance Series Spring event is a multi day self powered trail running and hiking series. It takes place from June 4 to June 7, 2026, at the Mohawk Mountain Ski Area in Cornwall, Connecticut.

Event Format

Participants can choose from several timed events with significant elevation gain, formatted as a FlexRelay. Events last 12, 24, 48, 72, or 84 hours, allowing for self managed pacing. Some events involve night trekking requiring a headlamp. Participants can enter as individuals, in teams of two (Trail Buddy), or in teams of three or four (Trail Family).

Available Distances

The series includes multiple named challenges:

  • Kuwohi: 15 miles with 7,140 feet of elevation over 12 hours.
  • Double Kuwohi: 28+ miles with 13,685 feet of elevation over 24 hours.
  • Denali: 43+ miles with 20,825 feet of elevation over 48 hours.
  • Everest: 61+ miles with 29,155 feet of elevation over 72 hours.
  • Olympus Mons Ultra: 152+ miles with 72,590 feet of elevation over 84 hours.
  • Answer the Bell Ultra: A format where participants complete a 1.2 mile loop with 600 feet of elevation gain every hour until they can no longer continue. It has both a Basic (28.8 miles, 14,400 feet) and Full (100+ miles, 50,400 feet) version.

Location and Amenities

The event is held at a rented ski area venue. Amenities included with registration are tenting space, a support station with shade, a fire pit, hydration, and snacks, as well as custom bibs, tokens, and medals. The event is described as a veteran owned series. Visit the organization's website for the most recent information.

United States Connecticut Cornwall

Race information

Website
Olympus Mons Ultra
Answer the Bell Ultra - Basic
Answer the Bell Ultra - Full
Denali
Double Kuwohi
Everest
Kuwohi
Visit the organization's website for the most recent information.
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