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8 running, triathlon, ultra, and other events in Maple Valley, Washington

From big races to Saturday morning group runs—find running, triathlon, ultra, duathlon, mountain biking, and walking events and connect with the local endurance sports community.

  • Pigtails Run - The "Flat" Fat Ass [ultrasignup.com]

    Sat, Dec 13, 2025

    50k Half Marathon Run Ultra

    Maple Valley, Washington, United States
    OpenStreetMap Google Maps
  • Westside MTB Henry's Ridge + WSBA XC State Championship [westsidemtb.com] [Register at runsignup.com]

    Sun, Mar 29, 2026 at 9:00 AM

    Description

    Singlespeed

    Bikes with only one gear.

    Clydesdale/Athena

    Men over 210 lbs (95 kg), women over 160 lbs (73 kg).

    For more information, visit WestsideMTB.com

    Mountain Biking

    27941 Maple Ridge Way SE, Maple Valley, Washington, 98038, United States
    OpenStreetMap Google Maps
  • Cedar River Half 13.1, 10k, 5k [sammamishrunning.com] [Register at active.com]

    Sun, Apr 26, 2026 at 9:00 AM

    Description

    Dust off those running shoes and get the year started off right with a personal best at his crisp air venue. We start off at the Maple Valley Market place and hit the Cedar/Green River trail with a...

    Dust off those running shoes and get the year started off right with a personal best at his crisp air venue. We start off at the Maple Valley Market place and hit the Cedar/Green River trail with a slight down hill to the River overlooking gorgeous views of Lake Wilderness as you compete against your racing pals and companions on this USATF certified course. Get one for the record books for 2026. All entrants get a deluxe Cedar River T-Shirt, finisher medal, and hot chili at the finished surrounded by your racing peers that just scored a person record in their division. Don't miss the ambiance of Maple Valley and their community. We thank King county for the beautiful work that they have done for these trails. Register today to get the 2025 prices. See you at the starting line!

    Event details and schedule

    Plenty of parking at the starting line Maple Valley Market place Shelter. Hot chili and festive music await you at the finish. The events start promptly at 9 am. Race packet pick up begins at 8 am. God speed!

    5k 10k Run Trail

    Maple Valley Market Place
    25719 Maple Valley Black Diamond Road SE, Maple Valley, Washington, 98038, United States
    OpenStreetMap Google Maps
  • Cedar River Triathlon [sammamishrunning.com] [Register at active.com]

    Sun, May 10, 2026 at 8:00 AM

    Description

    Join us for one of the top early premiere triathlons in the region. Get an edge on your triathlete competitors by performing well in this super sprint triathlon. You start off with a quarter-mile...

    Join us for one of the top early premiere triathlons in the region. Get an edge on your triathlete competitors by performing well in this super sprint triathlon. You start off with a quarter-mile swim in Lake Wilderness, typically the first week in May is in the 80s but the water is still a chilly 60F (wetsuits are allowed and encouraged). Next you start your 14-mile trek on 3 miles of road/asphalt followed by a hard packed dirt/limestone Cedar River trail. Slight downhill to the turnaround point which is also 2 miles of asphalt/bike path. Scenic views of the Cedar River as you speed across the trestle. This year we are eliminating the staircase and have a smooth transition onto the Cedar River Trail. All entrants get a super deluxe long sleeve mesh t-shirt, and all finishers get a forged Cedar River medallion. Apple, bananas, and oranges await you at the finish with festive Cedar River music. Photo finish - Smile ;).

    Event details and schedule

    Plenty of parking at the Lake Wilderness Park. There will be certified life guards in the water, and certified flaggers on the first time getting you through the intersection. Water, Gatorade, Gel, first aid on the course. AED and lifeguards are in the water for your safety- raise your hand if you can if you are having trouble. All bike handles must be plugged. Police and Search and Rescue have been notified. Brush off those running shoes and score your big finish this year at the 2026 Cedar River Tri!

    Trail Triathlon

    Lake Wilderness
    22601 SE 248th Street, Maple Valley, Washington, 98038, United States
    OpenStreetMap Google Maps

Local Clubs & Organizations

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