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Trail Running Calendar near Fairfax 2025-2026

Explore the top trail runs near Fairfax for 2025-2026! We've gathered 190 exciting races in the area. Check out our detailed list below to find your next local race.

June 2026
Jun
7
Sunday

Reston Sprint Triathlon

Triathlon
Jun
13
Saturday

OSS/CIA 50 Mile Night Run

Trail Run 25 mi 50 mi
Jun
14
Sunday

Cal Tri DC

Triathlon
Jun
14
Sunday

EOD Warrior Half

5 km Half Marathon
Jun
27
Saturday

Summer Forest Half Marathon

5 km 10 km Half Marathon
September 2026
Sep
5
Saturday

Dog Days of Summer 10k

5 km 10 km
Sep
5
Saturday

Arlington Police, Fire, Sheriff and ECC 9/11 Memorial 5K

5 km
Sep
20
Sunday

DCHalf Marathon

5 km Half Marathon
October 2026
Oct
3
Saturday

Black Nurses of Southern Maryland Health Fair and Walk/Run

2 mi 5 km
Oct
18
Sunday

Fall Run for the Wounded Half

5 km 10 km Half Marathon
Oct
25
Sunday

Halloween Horror 10k

Trail Run 5 km 10 km
December 2050
Dec
31
Saturday

Arsenal Triathlon

Triathlon
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