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Triathlon Calendar near Renton 2025-2026

Explore the top triathlons near Renton for 2025-2026! We've gathered 99 exciting races in the area. Check out our detailed list below to find your next local race.

July 2025
Jul
5
Saturday

Cherry Bomb Marathon

13 mi 26 mi 50 km
Jul
6
Sunday

Bottle Rocket Marathon

13 mi 26 mi 50 km
Jul
8
Tuesday

Seward Sizzler Trail Run

Trail Run 4 mi 10 km
Jul
12
Saturday

Cougar Mountain Trail Run Series #3

Trail Run 5 km 10 mi 19 mi
Jul
18-19
Fr - Sa

Mount Rainier Half Marathon

Trail Run 5 km 10 km 13 mi
Jul
19
Saturday

Float Dodger 5K

5 km
Jul
20
Sunday

B & O Half Marathon

10 km 13 mi
Jul
23
Wednesday

Dirt Circus - Seattle

Trail Run
Jul
26-27
Sa - Su

Jack & Jill Downhill Marathon

13 mi 26 mi
Jul
26
Saturday

Seattle - HFTC 5k

5 km
Jul
27
Sunday

Craft Classic Seattle

5 km 13 mi
Jul
27
Sunday

Lake Wilderness Aquathon

Aquathlon
August 2025
Aug
2
Saturday

Galloping Gertie

5 km 10 km 13 mi
Aug
2
Saturday

Lake Tye Triathlon

Triathlon
Aug
9
Saturday

Cougar Mountain Trail Run Series #4

Trail Run 5 km 14 mi 26 mi
Aug
10
Sunday

Lake Union 10K

10 km
Aug
10
Sunday

Sundae Runday

2 mi 5 km 10 km
Aug
16
Saturday

Lake Meridian Triathlon

Triathlon
Aug
16
Saturday

Twilight at the Bay

Trail Run 5 km 10 km 13 mi
Aug
16
Saturday

Emerald City 5k

5 km
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