Trail Running calendar near Merrimack 2026-2027

A community 5K in Jaffrey, NH offering a woods trail and a rail trail out and back. Proceeds support the volunteer Jaffrey Firefighters Company and equipment needs of the Jaffrey Fire Department.

A one mile obstacle course in Warren, RI with two giant mud pits, kids play area, food and giveaways. Proceeds support Thrive Outside and its programs to expand youth access to nature.

Pair up for a three hour endurance relay on a two mile loop of trails and fields. Alternate laps with your partner to accumulate the maximum distance possible in this team based challenge.

A community 5K in Hillsborough, NH on September 20, 2026, organized by the Hillsboro Fire Department. The off-road course may be uneven and strollers are not recommended; registration runs March 25 to September 19 with a $30 fee.

A traditional up and down mountain race in Waterville Valley, NH on September 20, 2026 covering about 7 miles with 3000 feet of ascent; youth entry is available and day of registration is offered.

The Arc'teryx Run Boston will take place in Milton on Sunday 20 September 2026. You can run 10 kilometers.

A community trail festival in Arundel, Maine offering 5k, 10k and half marathon distances on the ACT and Eastern Trail, with participant shirts and medals, a free kids' bike race, live music, and food.

An inclusive multisport festival at Pawtuckaway State Park on 09/26/2026 offering a 0.4 mile swim, 5.5 mile trail bike and 3 mile run in single sport, two sport, relay or full triathlon formats. No chip timing; safety gear is required.

A trail based 5K obstacle course race at Wasserman Park on September 26, 2026, featuring 12 or more beginner to intermediate obstacles. Entry is limited to 200 participants and the fee is $40.

A weekend of endurance mountain biking and trail ultrarunning at Ascutney Outdoors in West Windsor Vermont, offering 50 mile and 50 km solo races, multiple relay formats, and kids fun races. Proceeds support Vermont Adaptive.

Trail races at the Assabet River National Wildlife Refuge in Sudbury MA include a 10K, a 30K and a 6 hour timed event. The course uses dirt and gravel double track trails with two aid stations and cupless fueling.

A community run at Shedd Park featuring a 5K, a 10K trail run, and a 1-mile kids fun run, with educational displays and proceeds supporting LP&CT's conservation and education programs.

The Survival of the F.I.T.test - 30 Hour Trail Ultra will take place in Cumberland from Sunday 27 September 2026 to Monday 28 September 2026.

An ultramarathon in Center Conway NH using the Last Person Standing format on a 3.5 mile loop of forest singletrack, trails, fields, and logging roads with about 250 feet of gain per lap. Camping is available the night before.

A 25 kilometer trail race at the Edwin L. Smith Preserve in Kennebunkport on October 3, 2026, with proceeds supporting the Kennebunkport Conservation Trust. Registration is capped at 100 and a shirt-included cutoff is on September 5.

Trail races in Groton, Massachusetts on October 4, 2026, organized by local running and trails groups. Two distances, 9.5 miles and 3.4 miles, total entries limited to 250, online registration closes October 3.

A 26.4 mile trail marathon on Connecticut's Nipmuck Trail featuring rocks, roots, mud and wood bridges, plus a two-runner relay option. The course uses a 13 mile segment with out-and-back sections and published cutoffs.

Keene Family YMCA Fall Foliage Trail Races feature 5K and 10K trail courses starting and finishing at the Keene YMCA, with chip timing, age-group prizes, and proceeds supporting YMCA programs and access.

Mile for Mentoring is a one mile community event in Gilford, NH on October 4, 2026, with adult and youth categories and a free entry for children under 12. Early registrants before September 16 receive a complimentary race shirt.

A 5K trail race and 1-mile fun run at Tibbetts Field in Madbury, NH on October 4, 2026, featuring a 2-mile loop through Powder Major Forest over natural terrain. A portion of proceeds will support a local family in need.