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Marathon Calendar near Ontario 2025-2026

Explore the top marathons near Ontario for 2025-2026! We've gathered 3 exciting races in the area. Check out our detailed list below to find your next local race.

April 2026
Apr
17-18
Fr - Sa

Run4Kids Ultra Running Party

Backyard Ultra Half Marathon Marathon ... 100 mi 24 hr
May 2026
May
16
Saturday

O'Neill Park Trail Races

Trail Run 10 km Half Marathon ... Marathon 50 km
November 2026
Nov
7
Saturday

Saddleback Marathon

Trail Run 10 km Half Marathon Marathon
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