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.
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
68°
Typical Low
43°
Chance of Rain
18%
Based on US Climate Normals data from Boise Air Terminal, 2 mi from the venue.
Host City
About Boise, ID
Population
235,701
as of 2023
Elevation
2,866 ft
Nearest Airport
BOI
Boise Air Terminal/Gowen Field · 1 mi
Time Zone
Mountain Time
From Endurance Grid
A mid-size host city. Enough lodging and amenities to keep race weekend easy, without big-city sprawl.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at City of Trees Marathon, put it on the calendar, and turn “someday” into a start date.
125
Days to train
- Race
- City of Trees Marathon
- Date
- October 11, 2026
- Location
- 733 S Pioneer Street, Boise, ID
Coming Up
More Running races near Boise, ID
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Marathon
Less than a mile away
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Less than a mile away
GOTR Mile Presented By Hoopla
Less than a mile away
Christmas 5K/10K/Half Marathon in July - Boise
Half Marathon · 10K · 5K
Less than a mile away
From Endurance Grid
About This Sport
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.
Frequently Asked Questions (FAQs)
- What is the City of Trees Marathon?
- City of Trees Marathon is a running race held in Boise, Idaho on October 11, 2026. It is one of the many endurance events listed on Endurance Grid, a multi-sport endurance event calendar covering running races, triathlons, HYROX, and more endurance sports across the United States. Find more running races near you or explore our sports guides to learn what race day actually feels like.
- When and where is the City of Trees Marathon?
- Sunday, October 11, 2026 in Boise, Idaho at 733 S Pioneer Street, Boise, ID. Check the event page for exact start times and wave schedules.
- How do I register for the City of Trees Marathon?
- Registration is handled through the event's registration page. Confirm pricing and distances there, and sign up.
City of Trees Marathon
Oct 11, 2026