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Triathlon Calendar near San Mateo 2025-2026

Explore the top triathlons near San Mateo for 2025-2026! We've gathered 119 exciting races in the area. Check out our detailed list below to find your next local race.

February 2026
Feb
7
Saturday

Mt. Umunhum Trail Conquest - Winter

Trail Run 5 km 7 mi ... Marathon 50 km
Feb
7
Saturday

Golden Gate Trail Run

Trail Run 8 km Half Marathon ... Marathon 50 km
Feb
14
Saturday

Bay Breeze - San Leandro

Trail Run 5 km 10 km Half Marathon
Feb
21
Saturday

Redtail Ridge

Trail Run 5 km 10 km ... 30 km 50 km
Feb
21
Saturday

Montara Mountain Trail Run

Trail Run 10 km Half Marathon ... Marathon 50 km
Feb
28
Saturday

Victory

5 km 10 km Half Marathon
March 2026
Mar
1
Sunday

Zoom Angel Island

Trail Run 5 mi 10 mi 15 mi
Mar
14
Saturday

Marin Ultra Challenge

Trail Run 31 mi 50 mi
Mar
14
Saturday

Zoom San Francisco

5 km 10 km Half Marathon
Mar
21
Saturday

Oakland Marathon

5 km 10 km Half Marathon Marathon
Mar
21
Saturday

Redwood (Spring) Trail Run

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

Western Pacific Marathon

Trail Run 5 km 10 km Half Marathon
Mar
29
Sunday

Golden State 5K

5 km
April 2026
Apr
4
Saturday

Golden Gate Headlands Marathon

Trail Run 10 km Half Marathon Marathon
Apr
4
Saturday

Diablo Trails Challenge

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

Romancing the Island Half Marathon

Trail Run 10 km Half Marathon
Apr
18
Saturday

Horseshoe Lake Trail Run

Trail Run 5 mi 13 mi ... 26 mi 50 km
Apr
25
Saturday

Mt. Tam Wild Boar Half Marathon

Trail Run 10 km Half Marathon
May 2026
May
2
Saturday

Miwok 100K

Trail Run 100 km
May
3
Sunday

Aztec Run

5 km
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