Frost Heave
Berlin, United States • 16 May 2026
Coös Frost Heave trail race
The Coös Frost Heave is a roughly 13.1 miles trail race held in and around Jericho State Park in Berlin, NH. Traditionally open only to mountain bikers, the event is this year open to trail runners as well.
The course is mostly class IV road used by ATVs in the non-winter months, with some stretches of smoother terrain interspersed. Participants should expect rugged climbs and equally rugged descents and variable underfoot conditions, including mud and deep puddles where there may be no easy way around or over them. The organizer recommends bringing a dry pair of shoes and clothes for after the race.
Aid stations are available on course and are staffed by local volunteers. Post race offerings include food, beverages, prizes, raffles, and family-friendly activities.
Competition is organized in gender-specific categories within age groups listed as Under 17, Under 19, Under 35, and Masters. The Frost Heave is a fundraiser run by the Coös Cycling Club to support trail maintenance and active youth cycling programs; the event states that 100 percent of proceeds and sponsor dollars go to trails and youth programs.
Location details include Jericho State Park and the address 298 Jericho Lake Rd, Berlin, NH. Visit the organization's website for the most recent information.