City of Trees Marathon
- Date
- October 11, 2026
- Location
- 733 S Pioneer Street, Boise, ID
- Distance
- Marathon · Half Marathon · 10k & more
From the Organizer
Sunday, October 11, 2026
Course Maps will be updated once details have been finalized.
GREAT SWAG and T-SHIRT DEADLINE
Comfiest long sleeve t-shirt, swag thanks to our amazing sponsors, and finisher food/drink, all COT runners get a finisher's award. Please note that registrants registering after October 1, 2026 are not guaranteed a shirt.
Please note courses utilize the Boise Greenbelt system. Should we run the Greenbelt, the river can be unpredictable. Systems and entities that govern the local Greenbelt are constantly dealing with these challenges. Typical issues are created due to sidewalk construction, sinkholes, flooding, etc. During the run, you may encounter wildlife that may cause a delay in your progress and/or change in your planned route. Or you may cause your own delay to stop and listen to the amazing sounds this course creates.
Distances & Pricing
Race Location
About This Sport
From Endurance Grid's Founder
Endurance Grid is here to help you understand the sport, decide if it's the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer's event page.
The half marathon is the distance where you find out what you're actually made of. Long enough to demand real preparation. Short enough that it doesn't consume your life to train for it. Most people who run their first half describe it as the race that changed their relationship with what they're capable of. Once you cross this finish line, the bar moves. That's not a warning — that's the point.
Race day energy varies by event size, but the finish line feeling is the same regardless. Big races keep the noise going the whole way. Smaller races give you stretches where it's just you and the miles — and that solitude becomes its own kind of fuel.
The half marathon rewards people who show up for the boring training miles.
How long to train: 10–14 weeks. If you're already running consistently, 10 weeks of structured buildup is enough. If you're building from a casual base, give yourself 14.
Running
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Coming Up
More running races in ID
Frequently Asked Questions (FAQs)
- What is the City of Trees Marathon?
- City of Trees Marathon is a running event held in Boise, ID. Learn more about the different endurance sports here.
- When and where is the City of Trees Marathon?
- Sunday, October 11, 2026 in Boise, ID at 733 S Pioneer Street, Boise, ID. Check the official event page for exact start times and wave schedules.
- How do I register for the City of Trees Marathon?
- Registration is handled through their official registration page. Confirm pricing, distances available, and sign up there.
City of Trees Marathon
Oct 11, 2026