IRONMAN 70.3 Boulder
About the race
IRONMAN 70.3 Boulder offers a triathlon experience set against the backdrop of Colorado's Iconic Flatirons and scenic outdoor landscapes. Athletes take on a multi-discipline course featuring a reservoir swim, rolling mountain bike ride, and a run through local trails and roads.
The race consists of a 1.2-mile swim in the Boulder Reservoir, a 56-mile bike course through rolling terrain along Diagonal Highway and rural roads, and finishes with a 13.1-mile run along hard-packed dirt roads and reservoir trails.
Registration options include General Entry, Relay Entry for teams, and special entry packages through the IRONMAN Foundation or NIRVANA upgrade packs. Qualified early registrants can also take advantage of Flex90 benefits, including fee-free transfer and partial refund options.
On course Hydration & Nutrition
Maurten Gels & Solids are available on-course. GEL 100 and GEL 100 CAF 100 hydrogel sports fuels are provided at aid stations during the event.
What your entry includes
The course
The course features a 1.2-mile 1-loop counterclockwise swim starting at the east boat ramp of Boulder Reservoir and exiting at the west ramp. The 56-mile 2-loop bike course heads along Diagonal Hwy to Foothills Hwy, taking rural Hygiene Rd toward 63rd St with fast downhill sections and rolling hills. The 13.1-mile 2-loop run course follows trails around Boulder Reservoir, 63rd St, Monarch Rd, and 55th St featuring downhill rollers on hard-packed dirt roads.
ROKA Swim Course
This one-loop swim starts with athletes entering the Boulder Reservoir from the east boat ramp. The swim course is counterclockwise. Athletes will exit at the west boat ramp before heading towards transition.
ZOOT Bike Course
The 2-loop course starts at the incredible Boulder Reservoir and will head onto Diagonal Hwy towards Foothills Hwy. Athletes will have some short rollers until they make a right onto rural Hygiene Rd towards 63rd St at which point, it’s downhill and fast. Once you find your way back onto Diagonal Highway, continue past the Reservoir gates for Lap 2, it's one more loop of the above rollers and fast descents.
HOKA Run Course
The run will showcase all the views along Boulder Reservoir with this 2-loop counter clockwise run. From transition, athletes will head east towards the Boulder Reservoir dam, head north along the trail, hop out onto 63rd for a small section and then a left on Monarch Rd for a nice hard packed dirt road full of downhill rollers. After Monarch, athletes head south on 55th (also packed dirt) where some of the best runners in the world train daily. Take a left back into the Boulder north entrance, pass transition area and head out for a 2nd loop.
Race weekend schedule
Location
City insight: Boulder
Boulder is a city in Colorado at the foot of the Rocky Mountains, at about 1,650 metres, widely known as a training base for endurance athletes. Summers (June to August) are warm and dry with cool evenings, autumn is sunny and mild, winters (December to February) are cold with periodic snow, and spring can change quickly. Late spring to early autumn is the best time to race. The altitude means thinner air, so newcomers often feel it on hard efforts. Denver International Airport is about an hour away by road.
Know from the athletes
Good to know
Are two-person Relay Teams permitted?
Yes. A two-person relay can complete the race with any combination of disciplines. Relay teams may later add a third person if they wish.
Can all team members cross the finish line together?
No. Only the run leg relay participant can cross the finish line. The Competition Rules state that only the relay runner can cross the finish line; if the other team members cross the finish line with the runner, the team would receive a disqualification.
Can I be a team member on two different relay teams?
No. Team members are only allowed to compete on one relay team.
What will a Relay Team need to bring to Athlete Check-In?
All relay team members must have a photo I.D. If you are not yet registered to a team, you will need to do so at the Solutions table within athlete check-in to race with your relay team. Please bring a credit card to make the USAT one-day license payment if you are not already a USAT member.
How do I request to switch a Relay Member?
Contact the event email address to make any relay team member changes. Please provide the details of which team member you wish to cancel and provide the full name and email address of the new team member.
Do all Relay Team Members need to attend Athlete Check-In?
Yes. All teams MUST arrive together for Athlete Check-In to ensure that all the materials are accounted for. During Athlete Check-In, athletes will be required to sign their own individual waivers.
What is the Withdrawal Policy for a Relay Team?
Relay captains are eligible for a partial refund of the registration fee. Please review the withdrawal policy to reference the partial refund options.
Does each Relay Team Member receive a timing chip?
No. The relay team will receive one timing chip at bike check-in. The timing chip acts as a “baton” and team members must hand-off the timing strap/chip to move forward to the next discipline.
Do all Relay Team Members need to be the same age and gender?
No. Relay team members can be comprised of a mix of gender and age. *All participants must be 18 years of age on race day.
If a team member fails to make the course cut-off, can other team members still complete their leg of the race?
No. Failure to complete the swim or bike course within the time constraints will result as a DNF of the entire team.
If I am the swimmer or cyclist, how do I receive my finisher medal and finisher items?
The runner will collect all 3 finisher medals and hats for the entire relay team.
How does transition work?
Some events provide a relay pen, which is designated for the teams to gather. This is where the timing chip is passed, to move on to the next discipline. If the race provides a relay pen, only the cyclist is allowed in transition... If the race does NOT provide a relay pen, the cyclist and runner will meet their team members at the bike rack.