Trail Running calendar near Williamstown 2025-2026

Join the Sierra Club Lancaster Polar Bear 5K trail run and hike on January 10 for a chilly, scenic outing with some hills at Lancaster County Central Park. Chip timed and dog friendly, the event raises funds for local environmental grants.

Take on scenic trails at Killens Pond State Park in Felton Delaware with the Angela Ivory Memorial Trail Runs, offering 100 mile, 50k and 24 hour race options. A communal, challenging winter weekend where some distances fill quickly.

Run four 5k trail races at Elephant Swamp Trail in Monroeville, NJ from Feb 22 to Mar 15, 2026. Series scoring, end of series awards and a finisher medal at each race plus hot chocolate and a discount for full series.

Naked Bavarian is an ultra trail at Blue Marsh Lake in Leesport, PA with 20 and 40 mile options on mostly single track and gravel. Enjoy rugged climbs, supportive aid stations and a German style finisher memento.

Tackle rugged trails in French Creek State Park with a challenging Half Marathon or a fun 10k loop. Enjoy technical singletrack, scenic lake views and big climbs for a true trail running day in Elverson, PA.

Tackle the HAT Run 50K, a scenic and challenging trail race in Havre de Grace on March 21, 2026. Expect varied terrain, nearly 4,400 feet of climbing and a few stream crossings that keep the adventure real.

Tackle scenic, challenging single track trails in Wissahickon Valley Park with half and full marathon options. Expect rolling hills, technical sections, a finisher medal and a community focused race that supports local youth programs.

Join the Great Marsh Mud Mosey in Elverson on April 11 for a muddy 5K or 1 mile walk through marsh, woods and farmland with a grassy finish. Small field and festival vibe with proceeds benefiting the Great Marsh Institute and ChesCo Search..

Enjoy a scenic run or walk through maintained natural trails at the Institute Woods 6K in Princeton on April 11, 2026. Choose a 6K or a relaxed 3K, enjoy post run refreshments and a race shirt for early registrants.

Join the Turtle Derby, a turtle themed 5K on brewery trails supporting Susquehannock Wildlife. Enjoy a wooden finisher medal, costume contests, awards, live music and on site beer.

Hit the rolling, rugged singletrack at Rockland Rad Run Sunday April 12 2026 at Forever Farm in Mertztown PA, a trail running festival for all abilities. Choose a marathon, half, 10k or 5k then relax with postrace food and a free drink.

Take on rolling, technical trails at Fifth Street Rock Monster on Sunday April 12 2026 at Forever Farm in Mertztown PA, with marathon, half marathon, 10k and 5k options. Celebrate at the finish with local brews, awards and a commemorative c..

Join the Screamin' Hill Scramble 5K at Screamin' Hill Brewery on April 18, 2026 for a chip timed cross country style run over groomed trails and short cut grass. Finishers earn a coaster medal and each entry includes a custom tech shirt plu..

Take on a 50 km out and back along the scenic Schuylkill River Trail from Mont Clare through Valley Forge to Conshohocken. Run solo or with a 3 to 6 person relay team, enjoy aid stations, chip timing and finishers medals.

Join the Patriot Power 5K in Reading on April 29 to support Team RWB and honor veterans with a festive race at EnerSys Global HQ. Choose in person or virtual entry, earn a finisher medal, and enjoy a post race dinner and beer.

Run or walk the fifth annual Green Traill 5K in Easton on May 3, 2026 at Easton Cemetery, a volunteer run raising funds for Friends of Historic Easton Cemetery. Enjoy a timed 5K, a 2 mile walk, kids fun run and post race refreshments.

Race4Warriors on May 9 2026 in Lewes DE offers 5K, 10K and half marathon with Run, Race Walk or a Heavy March through Cape Henlopen State Park and Fort Miles. Finishers get a medallion and a lively post race party with bands and vendors.

Run the Dirty German Endurance Fest in Pennypack Park, Philadelphia with 25K, 50K and 50M options on a scenic figure eight course along Pennypack Creek. Enjoy finisher swag, chef made post race food and live accordion entertainment.

Trails To the Sky at Voorhees State Park invites runners to tackle a scenic, hilly trail course with a UTMB index 50k and a shorter 10k option. Expect rugged singletrack, observatory views, friendly aid stations, and custom finisher medals.

Conestoga Crusher is a rugged trail run at Kelly's Run with creek crossings, steep climbs and the scenic Pinnacle Overlook. Choose 10K, 5K or the free RunPA kids Little Crusher and enjoy chip timing while supporting Lancaster Conservancy.