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Marathon Calendar near Brentwood 2025-2026

Explore the top marathons near Brentwood for 2025-2026! We've gathered 5 exciting races in the area. Check out our detailed list below to find your next local race.

December 2025
Dec
1
Monday

World AIDS Marathon

5 km 10 km Half Marathon Marathon
January 2026
Jan
24
Saturday

Icebreaker Marathon

5 km Half Marathon Marathon
March 2026
Mar
28
Saturday

Heckscher State Park Marathon

5 km Half Marathon Marathon
May 2026
May
1-3
Fr - Su

Long Island Marathon

5 km 10 km ... 26 mi 36 mi
October 2026
Oct
3-4
Sa - Su

Forbidden Forest 30 Hour Ultra Run

Backyard Ultra 26 mi 50 km ... 100 km 100 mi
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