Washington DC's Premier Fall Marathon Tune-Up Race

Organized by DC Road Runners

December 2023 Update: Work on the 20 Miler website is continuing! Expect more changes and improvements in the coming months. All historical information is here, albeit in strange places at this point. We promise that we will clean everything up. If you have any questions in the meantime, please contact the race directors. Thank you for your patience. a group of runners crossing the start line of the National Capital 20 MilerThe National Capital 20 Miler is the DC-area’s premier fall tune-up race. Scheduled in close proximity to several prestigious marathons—the Chicago and New York Marathons, as well as the Marine Corps Marathon—the National Capital 20 Miler affords runners an excellent opportunity for a strong training run prior to race day. It is also an excellent race opportunity in itself.

Race Highlights:

2023 Race Date: September 24

Janet Braunstein 5 Miler

The Janet Braunstein 5 Miler is a pancake flat 5-mile race that runs in tandem with the National Capital 20 Miler. This race is dedicated to Janet Braunstein, who was a regular participant and frequent top finisher. Like the National Capital 20 Miler, this race offers runners an excellent training opportunity, tempo run possibility, or a fast racing experience all on its own. a pack of runners on the C and O Towpath competing in the National Capital 20 Miler

Additional Runner Benefits

Race Registration

Event registration customarily opens in May of each year. Both races start and finish at Carderock Recreation Area, Chesapeake and Ohio Canal Towpath, Potomac, MD 20854.

Limited Field! Enter early!

By terms of our permit with the National Park Service, the size of the field (20 Miler and 5 Miler combined) is limited to 300 runners. All runners must remain in single file on the bike path and must yield to pedestrians.

Event Sponsor

logo for Potomac River Running Store