MCRRC Groovin' Woodstock 7K

River's Edge Endurance Challenge is a nonprofit running event held at Brunswick Middle School, Maryland. The lineup includes a 5K (3.1 miles), a 3-Hour Endurance Race, and a 6-Hour Endurance Challenge. The largely trail-based course runs on the River's Edge Trail System, with about a mile on school..

The Fall Harvest 5k is a scenic trail race held at Claude Moore Park in Sterling, Virginia. Set amidst the vibrant colors of autumn, the course features forest paths and leaf-covered trails, offering a picturesque experience for both runners and walkers. This event is part of the Run Your PRCS Parks..

MoCo Dems 5K Fall FunRun is a 5K run/walk at Agricultural History Farm Park in Derwood, MD. Organized by the Montgomery County District 15 Democratic Caucus, it offers a 5K for adults, a Youth 5K, and a free option for youth 10 and under. The course is a natural trail through the park, with water st..

The Rick O'Donnell Memorial 5 Mile Trail Run and Ultra Challenge is held at Milkhouse Brewery at Stillpoint Farm in Mount Airy, Maryland. The event offers three ways to compete: a 5-mile trail run, a 4-hour Challenge, and an 8-hour Ultra Challenge. The course is a single, hilly 5-mile loop through f..

The Westover 5k & 10k takes place on October 18, 2025, at Bon Air Gardens in Arlington, VA. Distances offered: 5k 10k The event awards points toward the Year-Long 5k, 10k, and Back of the Pack Series, and toward the Fall Series. A virtual run option is available. Walkers and strollers are wel..

EX2 Adventures hosts the Fall Backyard Burn Trail Run at Lake Fairfax Park in Reston, Virginia. The event offers 5-mile and 10-mile trail options on a mostly singletrack course with a short prologue and minimal pavement, featuring views of Lake Fairfax, challenging rocks and roots, and a few short c..