3 ultra events in Boise, Idaho

Tackle the full Boise River Greenbelt on a beautiful loop course with a team of your friends on Saturday, May 9th 2026! Join us for the only relay race in the Treasure Valley at the second annual Boise Greenbelt Relays. New this year is a FULL 50 Mile Ultra Distance for Solo Runners.

JOIN US

Teams of two (2), Teams of four (4), Teams of six/seven (6 or 7 for one per leg!) or solo runners will collectively complete 45 miles (50 for the Solo Ultra Course) looping the entire span of the Boise River Greenbelt through central Boise, Garden City, Eagle, and Southeast Boise. The race will start and finish at Ann Morrison Park on Saturday, May 9th 2026.

New This Year! The solo event will be FIFTY (50) miles! Come tackle one of the fastest & flatest, non-looped 50 mile courses in Northwest.

Please note that the course closes at 5PM! If you (running solo) or your team are concerned about finishing within this window, please reach out directly to us at [email protected] and we'll work with you on specific arrangements.

RELAY LEGS

There will be six (6) different exchange zones along the course with seven (7) "legs".

Each "leg" will vary in distance from five (5) to eight (8) miles.

Teams can choose who runs each leg and who runs more than one (1) leg! It is allowed for a runner to complete consecutive legs. The course is currently being finalized, but expect to run the majority of the Greenbelt from Ann Morrison, to Eagle, to Lucky Peak and back to Ann Morrison.

HOW TO SIGN UP

PLEASE NOTE THAT YOU MUST SIGN UP ALL TEAM MEMBERS IN ONE TRANSACTION DURING REGISTRATION!

For a step by step video tutorial on how to sign up, click HERE.

You must provide the following information for each participant when registering a team:

• First & Last Name

• Email Address

• Date of Birth

• Gender

• Phone Number

• Address

You must also know your "Team Name" when registering a team.

Who is running each leg will need to be communicated to race management before the event, but not during registration. Race management will provide direction on how to submit this information after a team is registered.

EMERGENCY CONTACT

The emergency contact information for the individual registering the team will be used as the emergency contact information for the entire team. Please make sure they are available and aware of the event!

EXCHANGE ZONES AND OFFICIAL COURSE TIME LIMIT

The slap bracelet must be handed off in Exchange Zones in order to ensure accurate results, runner tracking, and safety! There will be bathrooms, parking, and aid stations at all Exchange Zones. The course will officially close at 5:00pm. We will be providing limited support after 5:00pm and allowing participants to finish after that time. Please contact [email protected] with any questions and concerns.

RESULTS

Results will be categorized by Solo (50 Mile Ultra Distance), Teams of Two (2), Teams of Four (4), and Teams of Six+ (6 and 7-person teams). Co-ed teams are allowed and all teams will be included in the same results category in their respective size division. Teams will receive an overall finishing time at the conclusion of the event. Individual leg splits may be tracked by participants but will not be officially reported by Boise Running.

NO TEAM? NO PROBLEM!

Please post in this Facebook group to create a team with others or see if anyone else is looking for people to join their team. You can also fill out this form. Filling out the form is NOT a registration or a commitment to register, just a way for us to help you find a team! Lastly, you can email [email protected] and we will do what we can to get you connected.

REMINDER: YOU MUST SIGN UP ALL TEAM MEMBERS IN ONE TRANSACTION DURING REGISTRATION!

TRANSFERS, REFUNDS, ETC.

Teams of Two (2) must have at total of only two (2) runners. No more, no less. Teams of Four (4) must REGISTER a total of four (4) runners but can run the relay with three (3) runners in the event that their fourth runner can no longer participate. If a Team of Four (4) only has two (2) runners that can still participate, they can email [email protected] to be transferred to the Team of Two (2) division. Teams of Six+ (6 or 7) must register a total of six or seven runners. If a Team of Six+ only has four (4) or two (2) runners that can still participate, they can be transferred to another division by emailing [email protected]. A refund will not be provided.

There will be no refunds for any registrations of the Boise River Greenbelt Relays. Participant substitutions and division transfers are allowed. Substitutions and division transfers are allowed and must be communicated to race management at [email protected] by Friday, May 8th at 6:00pm at the latest.

SWAG

Each participant will receive a swag item that has yet to be announced!

QUESTIONS?

Please check out the FAQs page or email [email protected] with any questions!