California Triathlon Calendar 2025-2026

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Explore the best triathlons in California for 2025-2026! Our updated list features 686 exciting races across the region. Find your next race in California below and join the running community at these great events!

May 2026
May
16-17
Sa - Su

Big Bear Spartan Trifecta Weekend

Obstacle Run 5 km 10 km 21 km
May
16
Saturday

Napa Wilderness Trail Runs

Trail Run 10 km 21 km 30 km 50 km
May
16
Saturday

Run for Amma

Trail Run 10 km 30 km 50 km
May
16
Saturday

Rim Rock 50 Mile Trail Challenge

Trail Run 50 mi
May
16
Saturday

Born to Run Ultra Marathon Extravaganza

Trail Run 10 mi 20 mi 30 mi 100 mi
May
16
Saturday

O'Neill Park Trail Races

Trail Run 10 km 13 mi ... 26 mi 50 km
May
16
Saturday

La Jolla Half Marathon

5 km 13 mi
May
17
Sunday

Gorgonio View Trail Run

Trail Run 10 km
May
17
Sunday

Venice Beach Half Marathon

5 km 13 mi
May
23-24
Sa - Su

Nanny Goat

Trail Run 6 hr 12 hr 100 mi 24 hr
May
25
Monday

Memorial Day 10K - Hemet

5 km 10 km
May
30-31
Sa - Su

Monterey Spartan Event Weekend

Obstacle Run 5 km 10 km
May
30
Saturday

Sonoma Coast Trail Runs

Trail Run 13 mi 30 km 26 mi 50 km
May
30
Saturday

San Jose Half Marathon

8 km 13 mi
May
30
Saturday

Beer City Half San Jose

5 km 10 km 13 mi
May
30-31
Sa - Su

Rock 'n' Roll San Diego

5 km 13 mi 26 mi
May
31
Sunday

Toro Park Trail Run

Trail Run 10 km 21 km 42 km
June 2026
Jun
6
Saturday

Shadow Of The Giants

Trail Run 20 km 50 km
Jun
6
Saturday

Wrigley River Run

5 km 10 km 10 mi
Jun
14-28
Su - Su

Tahoe 200

Trail Run 200 mi
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