In 7 days · Sun, Oct 11, 2026
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When
Sunday, October 11th, 2026
Where
1400 Bronco Ln, Boise ID
Distances
Marathon · Half · 10K · 5K
Typical weather
44–67°F · low rain risk
See last 10 years
On this date: rain 1 of the last 10 years
2025
49–60°F
dry
2024
48–75°F
dry
2023
46–59°F
rain
2022
52–72°F
dry
2021
40–53°F
dry
2020
41–61°F
dry
2019
30–56°F
dry
2018
35–57°F
dry
2017
43–57°F
dry
2016
49–61°F
dry
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Gear up
Going long? The fueling guide — gels, chews, and how to carry them →
Race-day forecast · Sunday, Oct 11
Cloudy · 60–73°F
Sunday, Oct 11starts near 60°F · 3% chance of rain · wind up to 12 mph
About this race
Event Date and Location
- Date: Sunday, October 11, 2026
- Location: 1400 Bronco Ln, Boise, ID
- Race URL: City of Trees Marathon Registration
Course Information
- Course Maps: Will be updated once details have been finalized.
- Greenbelt System: Courses utilize the Boise Greenbelt system.
- Environmental Factors: The river can be unpredictable and may cause delays.
- Wildlife Encounters: You may encounter wildlife that may cause a delay in your progress.
Participant Information
- Swag and T-Shirt Deadline: Participant T-shirt and all COT runners get a finisher's award.
- Registration Note: Registrants registering after October 1, 2026 are not guaranteed a shirt.
- Course Challenges: Expect potential issues such as sidewalk construction, sinkholes, and flooding.
- Experience the Course: Enjoy the amazing sounds this course creates while you run.
Course map
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