City of TreesBoise ID
26.2Marathon
$20
Sunday, October 10, 2027 · Boise, Idaho
26.2 miles through Boise State, Amity Road, and the river Greenbelt — rolling, scenic, and gold with October color. Four distances, one hometown finish line.
Registration
Free distance transfers until October 1 · Deferral to 2028 available until September 27
The course
Boise calls itself the City of Trees, and in the second week of October the Greenbelt proves it: miles of cottonwood canopy turning gold over a cold green river, with the foothills stacked up behind downtown.
The marathon and half marathon run a road course through the Boise State campus, down Federal Way for a wide-open view of the city with the foothills as a backdrop, and onto Amity Road — the same stretch where the original Les Bois Marathon ran, hill and all — before finishing back at Albertsons Stadium. The 10K and 5K stay closer to the stadium and the Greenbelt for a flatter, faster route.
This is a hometown-scale race. No corral chaos, no shuttle logistics — park once, walk to the start, and run.
Race week
Shu's Idaho Running Company — 1758 W State St, Boise.
Green Acres Food Truck Park — 767 S Pioneer St, Boise.
Albertsons Stadium — 1400 Bronco Lane, Boise. Open to all runners, including out-of-town pickup.
Can't make it? Race-morning pickup opens at 6:00 AM Sunday.
Albertsons Stadium. Ample parking at the start/finish — note BSU may charge for parking.
Mass start, chip timed.
Mass start, chip timed.
Food trucks, live music, and hot drinks at the finish.
Overall and age-group awards for every distance.
6 hours after the marathon start. We'll still wait on you — the finish line stays open to the last finisher.
Every entry includes
A soft-blend City of Trees tee in this year's design. Guaranteed for everyone registered by October 1.
A custom cottonwood-leaf medal for every finisher, every distance.
Live splits and finish alerts your family can follow from anywhere on the course — or from home.
Timeless Photo is on site capturing every finish. Scan the QR code at the race, or upload a selfie beforehand, so your shots are easy to find afterward.
Water, electrolyte drink, GU gels, and other fuel roughly every 2 miles — 9 stations on the marathon, 6 on the half, and 2 each on the 10K and 5K.
Live music, food trucks, and a beer garden right at the finish until the course closes.
Drop a bag under the black registration tent at the start/finish — clothing only, no valuables. Write your name and bib number on the outside; tape and markers are provided at check-in.
Portable toilets at the start/finish area and near every hydration station on course.
Shop
Browse the full lineup of City of Trees gear in our online store.
Shop now ↗Race gear
This year's City of Trees gear, in the same print as the race shirt. Add it to your registration or order it on its own, and choose how to get it at checkout.
Tickets and gear go on one order. Already registered? Order gear on its own.
Questions
Yes — transfers between distances are free until October 1. If you move to a shorter distance we'll refund the difference; moving up just costs the difference at your original pricing tier.
Entries are non-refundable, but you can defer to the 2028 race for free until September 27, or transfer your bib to another runner until October 1.
Headphones are fine — keep one ear open, since the Greenbelt stays open to the public. Strollers are welcome in the 5K. Dogs love the Greenbelt but have to sit this one out.
Ample parking is available right at the start/finish line at Albertsons Stadium — note that BSU may charge for parking. Plan to arrive by 7:00 AM to park, check gear, and get to the line before the gun.
We run in rain, wind, and cold — mid-October in Boise usually means a crisp 45°F start and a sunny 68°F afternoon. Only a safety emergency (lightning, flooding on the Greenbelt) delays or shortens the course, and we'll email and text every runner directly if plans change.