City of Trees Marathon
City of Trees Marathon is a running race on October 11, 2026 in Boise, ID, with entry fees from $45 to $85.
- Date
- October 11, 2026 (80 days to go)
- Location
- 1400 Bronco Ln, Boise, ID
- Price
- $45–$85
- Sport
- Running
From the Organizer
Sunday, October 11, 2026
Course Maps will be updated once details have been finalized.
GREAT SWAG and T-SHIRT DEADLINE
Participant T-shirt and 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, 3 mi from the venue.
Host City
About Boise, ID
Population
235,701
as of 2023
City 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.
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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.
With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.
Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.
Running
From 5K to marathon, running races are an 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 near Boise, ID
Instant Gratification Zero Mile Fun Run
From $35 · 733 S Pioneer St
Less than a mile away
St. Luke's FitOne 5K/10K/Half Marathon
5K · 10K · Half Marathon · From $35 · 700 W Jefferson St
Less than a mile away
SueB 5k
5K · From $25 · Julia Davis Park - 700 S Capitol Blvd: Opposite the Rose Garden
Less than a mile away
Boise Turkey Day 5K Run/Walk
5K · From $18 · 601 W Jefferson St.
Less than a mile away
Plan your trip
Make it a Racecation
Coming from out of town? There's more to Boise than race day. We'll help you line up nearby lodging, flights, a rental car, and things to do so you can make the most of your racecation.
Plan your trip to BoiseFrequently Asked Questions (FAQs)
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City of Trees Marathon
Oct 11, 2026