Sprint Triathlon Olympic Triathlon Aquabike

Lake Whatcom Triathlon

Date: Last held Jul 12, 2025, next date to be announced
Location: Bellingham, Washington

Registration for the next edition has not opened.

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Water temperature and wetsuits at Lake Whatcom Triathlon

Around July 12, Lake Whatcom typically runs about 65°F at the surface (61 to 72°F across 2011 to 2020). Wetsuits were legal every year at this date.

A model estimate from the USGS lake temperature model (daily surface temperatures for US lakes), not a measurement. Wetsuit cutoffs are USA Triathlon age-group rules. The race's own water temperature reading on race morning decides.

Start location and course

2219 Rimland Drive #301, Bellingham, WA 98229

Directions to the start

The pin marks the address the race lists, which is usually the start. The organizers have not shared a course map with us yet.

Where Lake Whatcom Triathlon ranks

No. 17 of 50 on Coldest triathlon swims

National lists computed from results, entry fees, course maps and water temperatures; they refresh through the day.

Race details

Where: 2219 Rimland Drive #301, Bellingham, WA 98229Map
Course: Road
Distances: Sprint Triathlon, Olympic Triathlon, Aquabike
Editions: 2025 (Jul 12, 2025), 2024 (Jul 13, 2024), 2023 (Jul 8, 2023), 2022 (Jul 9, 2022)
Status: The next edition has not been announced yet. Past events: Lake Whatcom Triathlon - Aquabike, Lake Whatcom Triathlon - Olympic Distance, Lake Whatcom Triathlon - Kids Splash n' Dash, Lake Whatcom Triathlon - Sprint Distance, Lake Whatcom Triathlon - Olympic Distance.

Organize this race? Add details or a correction

Quick answers

When is Lake Whatcom Triathlon?: The next date has not been announced.
How much does it cost?: See the registration page for current pricing.
What distances are offered?: Sprint Triathlon, Olympic Triathlon, Aquabike.
Where does it start?: 2219 Rimland Drive #301, Bellingham, WA 98229.

From the organizers

Established in 2017, the Lake Whatcom Triathlon is a USAT-sanctioned event and host of the WA State Age Group, High School and Club State Championships. The Olympic course includes a 1500-meter swim on Lake Whatcom, 40km bike ride along North Shore Drive and Y Road, and a 10km run around the trails of beautiful Whatcom Falls Park, with the transition area and start/finish lines at Bloedel Donovan Park. The race offers Olympic, Sprint, Aquabike and Kid’s Splash and Dash options. The event draws beginner to elite athletes, in individual and relay divisions, and includes an expo area for athletes and spectators.