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JUN 2026
20SAT
13
JUN
IRONMAN 70.3 Boulder
Boulder, US
SAT
13
JUN
Tutu Dash 5K
Broomfield, US
SAT
13
JUN
All-Out Summer Breeze
Arvada, US
SAT
13
JUN
Treat Trot - Denver
Thornton, US
SAT
13
JUN
Denver Miles for Melanoma 5K
Denver, US
SAT
13
JUN
Steps to Stability 5K
Denver, US
SAT
13
JUN
Stepping Stone 5K
Littleton, US
SAT
13
JUN
Jeremy Bitner Memorial 5k/10k
Englewood, US
SAT
13
JUN
5k Race : Summer Sizzle : June
Fort Lupton, US
SAT
13
JUN
Barr Lake
Brighton, US
SAT
13
JUN
Father's Day Fun Run 5K/10K/13.1 DENVER/AURORA
Centennial, US
SAT
13
JUN
Sam's Rainbow Run
Fort Collins, US
SAT
13
JUN
The Hundo and The Hundito
Bailey, US
SAT
13
JUN
The Springs Downhill Mile
Colorado Springs, US
SAT
13
JUN
Screaming Chicken Relay Race
Cheyenne, US
SUN
14
JUN
The Bullfrog Splashdown
Littleton, US
SUN
14
JUN
Garden of the Gods 10 Mile/10K and Trail Run
Colorado Springs, US
SUN
14
JUN
Treat Trot Colorado Springs
Colorado Springs, US
WED
17
JUN
Wednesday Worlds Palmer Park
Colorado Springs, US
FRI
19
JUN
HRCA Happy Hour Half K
Littleton, US
IRONMAN 70.3 Boulder
Saturday, June 13, 2026 · Boulder, United States
Distances
Half
Start location
About this race
The IRONMAN 70.3 Boulder features a 1.2-mile swim in Boulder Reservoir, presenting a significant challenge for triathletes. The event is set against the region's dramatic landscapes, inviting participants to test their endurance amidst natural beauty.
Following the swim, the 56-mile bike course winds through rolling hills along the Flatirons. The race concludes with a run on Boulder's trails, taking athletes through varied terrain to the finish line.