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Triathlon Calendar near Rancho Cucamonga 2025-2026

Explore the top triathlons near Rancho Cucamonga for 2025-2026! We've gathered 17 exciting races in the area. Check out our detailed list below to find your next local race.

November 2025
Nov
27
Thursday

Plymouth Rock n Run

5 km 10 km
Nov
27
Thursday

Rotary Club of Orange Thanksgiving Turkey Trot 5K

5 km
December 2025
Dec
6
Saturday

Fremont Canyon 28k Trail Run

Trail Run 28 km
Dec
21
Sunday

Reindeer Run Half Marathon - Riverside

5 km 10 km 15 km 13 mi
January 2026
Jan
10
Saturday

Citrus Heritage Run

5 km 10 km 13 mi
March 2026
Mar
14
Saturday

Nine Trails 35 Mile Endurance Run

Trail Run 17 mi 35 mi
May 2026
May
23-24
Sa - Su

Nanny Goat

Trail Run 6 hr 12 hr 100 mi 24 hr
November 2026
Nov
26
Thursday

Plymouth Rock n Run

5 km 10 km
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