Tri Boulder

Boulder Reservoir, Boulder, CO

july 22, 2023

TRI Boulder: Race details

As one of Colorado’s most popular summer triathlons, Tri Boulder offers many different multisport race distances, all in one eventful day! Join us for a full day of racing at the Rez.

TRI Boulder: Course distances & SCHEDULE

Long Course Boulder Beast Triathlon
1.2mi swim, 50 mile bike, 9.3 mi run

Olympic Triathlon
1500m swim / 26.4 mile bike / 6.2 mile run
Sprint Triathlon
750m swim / 17.3 mile bike / 3.1 mile run

Long Course Aquabike
1.2mi swim / 50 mike bike

Sprint Duathlon
3.1 mile run / 17.3 mile bike / 3.1 mile run

Multi-sport Relays
2-3 person teams can compete together in the multi-sport races

Race Day Schedule
5:30am: Transition Area Opens
5:45am - 7:30am: Race Day Packet Pick Up
7:05am: Boulder Beast Waves Start
7:07am: Aquabike
7:13am-7:27am: Olympic Triathlon Starts
7:30am-7:45am: Sprint Triathlon Starts
7:50am: Duathlon Start
8:30am: Swim Cut-Off
9:00am: Sprint Tri Awards
9:45am: Duathlon Awards
10:00am: Olympic Tri Awards
12:00pm: Boulder Beast Aquabike Awards
12:30pm: Bike Cut-Off
1:00pm: Boulder Beast Tri Awards
3:30pm: Run Cut-Off / Course Closed

Tri Boulder: Pricing

Distance10/24 - 10/31through 12/31through 5/21through 7/167/17-7/22
Sprint Tri$90$100$110$120$125
Olympic Tri$115$125$135$145$150
Long Course Tri$165$175$185$195$200
Long Course Relay$180$190$200$210$220
Long Course Aqubike$130$140$150$160$160
Sprint Duathlon$90$100$110$120$125
Sprint Duathlon Relay$115$125$135$145$155
Sprint Tri Relay$115$125$135$145$155
Olympic Tri Relay$135$145$155$165$175

Tri Boulder: Packet Pick Up

Photo ID Required 

You must pick up your own race packet.

USAT annual members must bring proof of current USAT Membership.

Thursday, July 20
4:00pm - 7:00pm
Coming soon

Friday, July 21
Road Runner Sports Westminster
10442 Town Center Dr Suite 300, Westminster, CO 80021

Saturday, July 22
Race Morning - Finish Line Trailer 
Boulder Reservoir Parking Lot


Tri-Boulder: sponsors

TRi Boulder: course Maps


Swim Course

Boulder Reservoir
Sprint 750m (0.47mi) - Olympic 1500m (0.93mi) - BEAST  1900M (1.2MI)
Swim Course

Bike Course

boulder reservoir
Sprint 17.3mi - Olympic 26.4mi - BEAST 50MI
Sprint CourseolympIC & BEAST Course

Run Course

boulder reservoir
Sprint 5K (3.1mi) - Olympic 10K (6.2mi) - BEAST 9.3MI
RUN Course
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