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Great Falls Half (Half/10k/5k)

Name: Great Falls Half (Half/10k/5k)
Start: 2026-11-21
End: 2026-11-21
Location: Potomac

Potomac, Maryland, United States

calendar_today 21 Nov, 2026

directions_run Running

language Official Website

sell $50.00 – $60.00

About the Event

Great Falls Half, 10K & 5K
Saturday, November 21, 2026 · Great Falls Tavern, Potomac, MD

Run the C&O Canal towpath along the Potomac, starting and finishing beside Lock 20 at Great Falls Tavern. All three distances head south along the canal past Widewater, Old Angler's Inn and Carderock, then turn for home. The towpath is flat, shaded crushed stone that was built for mules and is perfect for a fast fall race. Late November is the towpath's best season: the crowds are gone, the air is cool, and with the leaves down you get long views of the river.

Every runner is tracked live on Geo.Racing, so your people can follow you down the towpath and be at the line when you finish. Collect your medal, then walk the boardwalk to the Great Falls Overlook and watch the Potomac pour into Mather Gorge.

Start times: Half marathon at 12:00 PM, 10K at 12:30 PM, 5K at 1:00 PM. Finish line closes at 3:00 PM.

Every entry includes: a race shirt, a finisher medal, chip timing and results, aid stations on the towpath, and live GPS tracking. Awards go to the top three men and women at each distance.

Good to know: the field is capped under our National Park Service permit, so register early. The park charges $20 per vehicle (card only) at the Great Falls Tavern gate, and parking is limited, so carpool if you can. The towpath stays open to other walkers and cyclists: keep right and pass on the left.

Presented by Old Dominion Racing.

Races Offered

Great Falls Half Marathon

Nov 21, 2026

straighten

Distance — 21.1K

terrain

Type — Running

timer

12:00

sell

$60.00

Great Falls 10k

Nov 21, 2026

straighten

Distance — 10K

terrain

Type — Running

timer

12:30

sell

$55.00

Great Falls 5k

Nov 21, 2026

straighten

Distance — 5K

terrain

Type — Running

timer

13:00

sell

$50.00

Weather History

These values represent the 3-year monthly averages for November in Potomac.

thermostat Temperature

4.6° / 13.8°

wb_sunny Feels like

0.6° / 10.1°

light_mode Avg sunshine hours

7h 43m

water_drop Avg rainfall

1.8 mm

ac_unit Avg snowfall

—

air Avg wind speed

11.7 km/h (Light breeze)

opacity Sweat loss rate

Low

terrain Course conditions

Firm and slightly soft

sunny Max UV Index

Low (2.0)

humidity_mid Humidity

64.9%

wb_twilight Sunrise

07:51

nightlight Sunset

17:54

About Potomac

Learn more about the host city, Potomac.

Potomac is an unincorporated community and census-designated place in Montgomery County, Maryland, United States. As of the 2020 census, it had a population of 47,018. It is named after the nearby Potomac River. A part of the Washington metropolitan area, many Potomac residents work in nearby Washington, D.C., and Northern Virginia.