Trail Running calendar near Billings 2025-2026

The Fat Sass Switchback Challenge is a trail running event held in Millburn, New Jersey, at the South Mountain Reservation's Locust Grove Picnic Area. Scheduled for October 5, 2025, it features a challenging 1-mile loop course with 300 feet of elevation gain, including steep climbs and technical, ro..

Set in Montebello, New York, the KMT Fall Foliage Frenzy is a trail-running event featuring 3-hour and 6-hour timed races. Runners tackle a challenging 2.33-mile loop with about 660 feet of vertical gain, weaving through Kakiat Park against the backdrop of Harriman State Park and the Hudson Valley’s..

The Norfolk Land Trust Trail Race Series, including the Haystack Mountain Challenge, is held annually in Norfolk, Connecticut. The 12th edition features three trail race distances: a challenging 5K through Barbour Woods with scenic climbs and wetlands; a 10K that adds a tough loop summiting Haystack..

IBBC Trail Classic 5k and Kid's Trail Run presented by Peace, Love, Trails takes place in Irvington, New York, with the event centered around the Irvington Woods trail system near 40 N Broadway. The lineup includes a 5k Trail Run/Walk through scenic woodland paths and a 0.6-mile Kid's Trail Run for..

Tesla Hertz Run is an ultrarunning event in Rocky Point, New York, offering multiple distances on a single Long Island course: 150‑mile, 100‑mile, 100K, 50‑mile, 50K, a 10‑mile, and a night-time 10‑mile option. The course features a scenic 10.48‑mile loop through pine barren terrain, with two aid st..

Forbidden Forest 30 Hour Ultra Run takes place in Roosevelt Forest, Stratford, Connecticut, October 11-12, 2025. Runners choose a personal challenge on a 2.23-mile loop that weaves through roots, rocky terrain, and a standout hill dubbed "OMG." Competitors can tackle 26.2M, 50K, 50M, 100K, 100 Miles..

Gemstone Sparkle Sprint 5k is a community trail run in Wilton, Connecticut, on Gemstone Farm (144 Huckleberry Hill Rd). The second annual event offers a scenic 5k trail course suitable for all abilities (strollers not allowed on the course) with a festive sparkly theme inviting participants to dress..

Costumed Creature Crawl 5K Trail Run/Walk is an in-person and virtual race in Beach Lake, Pennsylvania, at the Van Scott Nature Reserve of the Delaware Highlands Conservancy. It offers a 5K trail run or walk for adults, plus options for ages 6-15 and free Crawlers age 0-5. Trails are not stroller-fr..

NSRF Great Pumpkin Dash Trail 5K is a Halloween-themed run/walk held at Blydenburgh Park in Smithtown, New York. The scenic, shaded course weaves through dirt roads and hard-packed trails with a few sandy spots, offering a non-technical trail experience suitable for first-time runners; strollers and..

The Paine to Pain Trail Half-marathon is scheduled for Sunday, October 12, 2025, in New Rochelle, Westchester County, New York. The race is organized by NewRo Runners and is part of the Trail Mix Series, a group of seven trail races in Westchester County, NY and Fairfield County, CT. The event uses..

Mohawk Mountain Race, at Mohawk Mountain Ski Area in Cornwall, CT, offers 5K, 10K, half marathon, and marathon distances. The course turns a ski mountain into a challenging trail race, with steep climbs and descents and views of fall foliage. The 5K loop climbs the left side via the Wildwood and Tim..

The Fred Torres Memorial 5K is the 12th annual charity race at Garrett Mountain in Woodland Park, New Jersey. The live event features a 5K run on a championship cross-country course and a 2-mile walk, with a virtual 5K option for remote participants. Family-friendly events include a Tot Trot and a 1..

Tom Centinaro Memorial "Dam" Race is a 3.5-mile trail run/walk hosted by the Wolcott Lions Club in Wolcott, Connecticut. The race unfolds on the scenic, flat Mill Pond Trail at Woodtick Recreation, 201 Nichols Road. This community event benefits local charities and the Tom Centinaro Lions scholarshi..

The Mt. Tom Trail Race takes place on October 18, 2025, with the start/finish and parking at Bray Lake in Mt. Tom State Park. The event is a nonprofit fundraiser that supports the Kestrel Land Trust. Registration fees are non-refundable and non-transferable. Check-in is held one hour before each ra..

The Castle to River Run in Garrison, NY, is a scenic running event held in the historic Hudson Valley, featuring a half marathon and a 5K race, along with a kids fun run. The half marathon course winds through Hudson Highlands State Park, passing the historic Osborn Castle and offering a mix of sing..

Big Bear SquaTCh South, a Sassquad Trail Running event in Harriman State Park, Tuxedo, New York, features a challenging pair of trail races: a 13.1-mile half marathon and a 10K, starting and finishing at Powerhouse Park. The single-loop courses are rugged and technical, with 2,200+ ft of gain on the..

The Hot Chili Challenge 8 Mile Trail Run, 5K & Kids Fun Run takes place in Andover, New Jersey. The event features an 8 mile trail run and a 5K for adults, plus a Kids Fun Run for ages 5-12. The atmosphere blends competition with a chili-themed, community race vibe, including on-site homemade chili,..

The Veeder Tree Farm 5K is a running event held in Earlton, New York, at 1235 High Hill Rd. Scheduled for October 19, 2025, the race offers multiple categories including a 5K, 5K Trail Run, and combinations thereof, with options for students as well. The course features a mix of trail and traditiona..

Bimblers Bluff 50K is an off-road ultramarathon in southern Connecticut, starting at Guilford Lakes School in Guilford. The 50-kilometer course weaves through interconnected woodland preserves, using rolling forest roads and rocky single-track. The route is notable for not requiring repeated loops,..

FALL Run The Farm is a trail race held at Muscoot Farm in Katonah/Somers, New York on October 19, 2025. The main event is a 5-mile trail race. The event program also includes two kids races: one for ages 7-12 and one for ages 2-6. The main 5-mile race is open to ages 6 through 108. The event is or..