Celebrate 20 years of community, fitness, and giving back at the Lake Wilderness Triathlon & Run Festival on Saturday, June 6, 2026, in scenic Maple Valley. This special anniversary edition offers something for everyone: choose a triathlon to swim, bike, and run your way to new friends, a duathlon if you'd rather skip the swim, or a running-only event to join the fun at your own pace. You can even form a custom relay team with friends or family, making it the perfect inclusive challenge at beautiful Lake Wilderness Park. The event is driven by a powerful community spirit, having donated thousands to Backpack Buddies and Seattle Children's Hospital and providing comfort to children through local police and fire departments.
With a supportive, welcoming atmosphere ideal for first-timers and a scenic Pacific Northwest course that will delight seasoned athletes, this is more than a race—it's a local tradition that promotes health and directly enriches the community. Event rates increase on April 26 and May 24, so register early to secure your spot in this 20th-anniversary celebration. Whether you're chasing a personal best, starting a new fitness journey, or simply looking for a fun and meaningful way to spend a June morning, the Lake Wilderness Triathlon & Run Festival is your destination. Join the celebration and help make the next 20 years even better.
Races Offered
10K
Jun 06, 2026
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Distance —
10K
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Multisports
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16 days remaining
5.5K
Jun 06, 2026
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Distance —
5.5K
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Multisports
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16 days remaining
Half Marathon
Jun 06, 2026
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Distance —
21.1K
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Multisports
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16 days remaining
Olympic Relay
Jun 06, 2026
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Distance —
40 km 10 km
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Multisports
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16 days remaining
Olympic Tri
Jun 06, 2026
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Distance —
40 km 10 km
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Multisports
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16 days remaining
Sprint Relay
Jun 06, 2026
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Distance —
22.1 km 5.5 km
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Multisports
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16 days remaining
Sprint Tri
Jun 06, 2026
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Distance —
22.1 km 5.5 km
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Multisports
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16 days remaining
Weather History
These values represent the 3-year monthly averages for June in Maple Valley.
thermostatTemperature
9.5° / 20.3°
wb_sunnyFeels like
7.6° / 18.6°
light_mode
Avg sunshine hours
11h 28m
water_drop
Avg rainfall
2.1 mm
ac_unit
Avg snowfall
—
air
Avg wind speed
8.0 km/h (Light breeze)
opacity
Sweat loss rate
Low
terrain
Course conditions
Firm and slightly soft
sunny
Max UV Index
Moderate (5.6)
humidity_mid
Humidity
73.1%
wb_twilight
Sunrise
05:11
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Sunset
21:05
About Maple Valley
Learn more about the host city, Maple Valley.
Maple Valley is a city in King County, Washington, United States. The population was 28,013 at the 2020 census, and was estimated to be 28,553 in 2024. The city functions as a commuter town to Seattle for residents, though there is an increasing amount of commercial activity in the area.
