City of Trees Marathon

Boise, ID, USA · October 11, 2026

45°·60° high·Breezy·Dry

Weather

Race Day Weather

45°at start

63° high

Breezy

Dry

Cool conditions, moderate winds

Runners will face a cool start at 46°F, rising to a maximum of 62°F by the finish. With a moderate headwind of 12 mph and gusts up to 23 mph, pacing adjustments may be necessary. Humidity is low at 47%, allowing for a comfortable race without hydration concerns.

Race day forecast available in 16 days

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Distance: 26.2mi

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Race Info

The City of Trees Marathon in Boise, Idaho, offers runners a scenic journey through the city's lush parks, tree-lined streets, and along the picturesque Boise River. The course features a mostly flat terrain with subtle elevation changes, providing a comfortable yet engaging running experience. Participants can expect well-marked paths, frequent aid stations, and a vibrant community atmosphere that showcases Boise's natural beauty and welcoming spirit.

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Course Map

FAQ

When is the 2026 City of Trees Marathon?

The 2026 City of Trees Marathon will be held on Sunday October 11, 2026.

Is the City of Trees Marathon a Boston Marathon Qualifier?

No, the City of Trees Marathon is NOT a Boston Marathon qualifier.

What is the time limit for the City of Trees Marathon?

The time limit for the City of Trees Marathon is 6 hours.

What will the weather be like for the 2026 City of Trees Marathon?

The forecast calls for a high of 71°F and a low of 47°F with a 3% chance of rain.

Historical Weather

Based on 4 years of data

Avg Temp

69°F

L:49° H:69°

RunScore

Conditions

Rain Freq

0 of 4 yrs

Wind10mph

Dew35°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2025 City of Trees Marathon Clear conditions throughout the day. 2025	46°/58°	-	36°
2024 City of Trees Marathon Clear conditions throughout the day. 2024	51°/73°	-	38°
2023 City of Trees Marathon Partly cloudy throughout the day. 2023	53°/70°	-	40°
2022 City of Trees Marathon Clear conditions throughout the day. 2022	47°/73°	-	25°

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