Clayton close

Half Marathon Calendar near Clayton 2025-2026

Monthly updates for Clayton

Get new running races (and updates) in your inbox every month.

Explore the top half marathons near Clayton for 2025-2026! We've gathered 34 exciting races in the area. Check out our detailed list below to find your next local race.

December 2025
Dec
27
Sa

Brazen Almost New Year's Eve

5 km 10 km Half Marathon
Dec
27
Sa

Brazen New Year's Eve

Trail Run 5 km 10 km Half Marathon
Dec
27
Sa

The Best Races - San Francisco

5 km 10 km 13 mi
January 2026
Jan
1
Th

Brazen New Year's Day

Trail Run 5 km 10 km Half Marathon
Jan
17
Sa

The Best Races - San Francisco

5 km 10 km 13 mi
Jan
31
Sa

Coyote Hills Run

Trail Run 5 km 10 km Half Marathon
February 2026
Feb
14
Sa

Bay Breeze - San Leandro

Trail Run 5 km 10 km Half Marathon
Feb
21
Sa

Redtail Ridge

Trail Run 5 km 10 km ... 30 km 50 km
Feb
28
Sa

Victory

5 km 10 km Half Marathon
March 2026
Mar
1
Su

Livermore Valley Half Marathon

5 km Half Marathon
Mar
21
Sa

Oakland Marathon

5 km 10 km Half Marathon Marathon
Mar
21
Sa

Redwood (Spring) Trail Run

Trail Run 5 km 5 mi ... Marathon 50 km
Mar
28
Sa

Western Pacific Marathon

Trail Run 5 km 10 km Half Marathon
April 2026
Apr
4
Sa

Diablo Trails Challenge

Trail Run 5 km 10 km Half Marathon 50 km
Apr
11
Sa

Romancing the Island Half Marathon

Trail Run 10 km Half Marathon
Apr
11
Sa

Lake Chabot Trail Run

Trail Run 8 km Half Marathon ... Marathon 50 km
Apr
18
Sa

Badger Cove Half Marathon

Trail Run 5 km 10 km Half Marathon
Apr
26
Su

Alameda Hospital Foundation 10K

5 km 10 km Half Marathon
May 2026
May
9
Sa

Grizzly Peak Trail Run

Trail Run 10 km Half Marathon ... Marathon 50 km
May
16
Sa

Wildcat Half Marathon

Trail Run 5 km 10 km Half Marathon