Boulder Sunset Triathlon
at the Boulder Reservoir, Colorado
August 29, 2026
Join us for an unforgettable morning at the Boulder Reservoir. Although this race does not take place at sunset, it will take place at the end of the summer-- it's sister race is the Boulder Sunrise in June. Experience gorgeous views at the recently upgraded venue. All participants receive stellar race shirts and finisher medals, too. This race is a favorite for beginners due to the flat bike course and a packed dirt trail run course.
REGISTERATHLETE GUIDEBoulder Sunset TRI: race details
Olympic Triathlon
1500m swim / 26.4 mile bike / 6.2 mile run
Sprint Triathlon
750m swim / 17.3 mile bike / 3.1 mile run
Olympic Aquabike
1500m swim / 26.4 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 to complete the Olympic Triathlon Relay, Sprint Triathlon Relay or Sprint Duathlon Relay
Race Day Schedule
6:00am: Transition Area Opens
6:00am: Race Day Packet Pick Up
7:15am: Olympic Waves Start
7:30am: Sprint Waves Start
7:30am: Duathlon / 10k & 5k Run Start
8:45am: Swim Cut-Off
10:30am: Bike Cut-Off
12:00pm: Run Cut-Off / Course Closed
boulder sunset triathlon: Pricing
| Distance | 11/1 - 11/10 | through 12/31 | through 6/22 | through 8/23 | 8/24 - 8/29 |
|---|
| Sprint Tri | $100 | $110 | $120 | $130 | $140 |
| Aquabike | $100 | $110 | $120 | $130 | $140 |
| Duathlon | $100 | $110 | $120 | $130 | $140 |
| Olympic Tri | $125 | $135 | $145 | $155 | $165 |
| Sprint Tri Relay | $120 | $130 | $140 | $155 | $165 |
| Olympic Tri Relay | $140 | $150 | $160 | $170 | $180 |
| Duathlon Relay | $120 | $130 | $140 | $155 | $165 |
Boulder sunset triathlon: Packet Pick Up
Photo ID Required
You must pick up your own race packet.
USAT annual members must bring proof of current USAT Membership.
Relay Teams must pick up their packet together!
Thursday, August 27
Arvada Triathlon Company
14715 W 64th Ave, Arvada, CO 80004
4:00pm - 6:00pm
Athlete Briefing and Q&A at 5:30
Friday, August 28
Road Runner Sports Westminster
10442 Town Center Dr. Suite 300, Westminster, CO 80021
3:00pm - 7:00pm
Saturday, August 29
Race Morning Pick-Up ($10 pick-up fee)
Boulder Reservoir Parking Lot
5:30am-8:00am
Hotel PARTNER
BOOK NOWBoulder sunset triathlon: sponsors
Boulder Sunset TRI: course Maps
bold beautiful scenic courses
Swim Course
Boulder reservoir
Sprint 750m (0.47mi) - Olympic 1500m (0.93mi)
Run Course
boulder reservoir
Sprint 5K (3.1mi) - Olympic 10K (6.2mi)
