One Day Hike



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Georgetown, C&O Canal NHP, Washington, DC

The Event

The One Day Hike (ODH), organized by the Sierra Club Potomac Region Outings (SCPRO), has been held since 1974. It comprises two concurrent, non-competitive hikes of 100 km or 62.1 mi (100K) and 50 km or 31.1 mi (50K). Both hikes proceed on the C&O Canal towpath along the Potomac River, ending in Harpers Ferry/Bolivar, WV. During the hike, hikers are provided with food and drink and, if necessary, first-aid assistance, at set support stations, manned by volunteers. While on the trail, they are monitored by volunteer bike patrollers.

Official Notices

Official notices and updates are emailed to the on-line discussion group. Registrants are strongly encouraged to join by sending a blank email to Notices will also be also posted on

For More Information

Visit the One Day Hike website ( for general information about how to prepare for the hike, the training hike schedule, what to bring on hike day, logistics, volunteering, and ordering T-shirts. At the website you will also find results from previous years and pictures from the hike and the annual picnic. If you have any questions, contact

Registration for 5-Time Finishers

January 30, 5:00 PM, through February 2, 5:00 PM

Regular Registration

February 9, 5:00 PM, through April 10, 11:59 PM (midnight), or after 350 registrations

Transfers and Cancellations

Registrations are not transferable. To cancel a registration and obtain a refund (minus a $15 processing fee), a request must be sent to the ODH Director ( by April 4 (11:59 PM).


The ODH is always looking for dedicated volunteers to help run the event. If you are too late to register and would like to volunteer, or you know someone who is interested in volunteering, contact the ODH Director ( to request more information, or see announcement. First-time volunteers receive a free ODH T-shirt. Volunteering is the best way to support your fellow hikers.

Event details and schedule

100K Start

The 100K starts at 3 AM from the Thompson Boat Center parking lot in Washington, DC. Hikers should arrive by 2:15 AM.

50K Start

The 50K starts at 10 AM from the Whites Ferry parking lot in Montgomery County, MD. Hikers should arrive by 9:15 AM.

The Route

The hikes proceed along the C&O Canal Towpath, and end at the Bolivar Community Center, just west of Harpers Ferry. Support stations providing food, drink, and first aid are available along the route. Hikers arriving at support stations after cut-off times are asked to leave the hike. All hikers must finish the ODH by midnight. Return shuttles are available for a fee.

What to Bring

- 1-2 quarts of water or sports drink. You will be able to refill your drink and get food at the support stations.
- Flashlight/headlamp with fresh batteries.
- Bring/wear weather-appropriate clothing.
- Cell phone, fully charged.

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