City of Trees Marathon

Boise, ID, USA · October 10, 2026
partly-cloudy-day49°·63° high·Breezy·Dry
9
Register
Weather
Pace Calc
Course
Race Info
FAQ
History

Race Day Weather

partly-cloudy-day
49°at start
66° high
Breezy
Dry

Cool conditions, steady winds

Runners will face a temperature rising from 49°F at the start to 64°F by the finish, with a gentle breeze from the SE at 9 mph. Humidity is moderate at 45%, making for comfortable conditions. The wind will be a tailwind throughout, providing a slight advantage for pacing, but hydration should still be prioritized.

Race day forecast available in 75 days
partly-cloudy-night9
partly-cloudy-night9
partly-cloudy-night9
partly-cloudy-day9
partly-cloudy-day9
partly-cloudy-day9
partly-cloudy-day9
partly-cloudy-day8
partly-cloudy-day9
partly-cloudy-day9
partly-cloudy-day8

Pace Calculator

Distance: 26.2mi
0:00:00
HH:MM:SS
Pace
—
Weather Adj.
—
Common Goals:

Get forecast alerts for City of Trees Marathon

We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.

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.

Website
Area Map

Course Map

Course Map Unavailable

We don't have course map data for City of Trees Marathon yet. If you have a GPX file (or other format) for this race, we'd love to add it!

FAQ

Ask a Question about the City of Trees Marathon

Racecast Concierge (free during beta)

Ask a question about the City of Trees Marathon and we'll do the hard part and find the answer for you within 48 hours.

By using Racecast Concierge, you agree to receive email alerts pertaining to the City of Trees Marathon and general racecast.io updates.

When is the 2026 City of Trees Marathon?

The 2026 City of Trees Marathon will be held on Saturday October 10, 2026.

Is the City of Trees Marathon a Boston Marathon Qualifier?

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

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 2% chance of rain.

Historical Weather

Based on 2 years of data
Avg Temp
65°F
L:49° H:65°
RunScore
8
Conditions
Rain Freq
0%
0 of 2 yrs
Wind9mph
Dew38°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults

2025 City of Trees Marathon

Clear conditions throughout the day.

2025
clear-night
46°/58°-
8

2024 City of Trees Marathon

Clear conditions throughout the day.

2024
clear-night
51°/73°-
9

More ID Races

Boise Half
2026-11-14 · Boise, ID, USA
Famous Idaho Potato Marathon
2027-05-15 · Boise, ID, USA
Mesa Falls Marathon
2026-07-18 · Ashton, ID, USA
Idaho Falls Marathon
2026-07-25 · Idaho Falls, ID, USA
Pocatello Marathon
2026-09-05 · Pocatello, ID, USA
Hayden Lake Marathon
2026-10-10 · Hayden, ID, USA
Free guidesMarathon Fueling Guide·Carb Loading Guide·Race Morning Guide·Race Day Gear Guide·Pacing Strategy Guide·Mental Strategy Guide

Race Day Alerts

Get notified when the City of Trees Marathon forecast shifts — so you can adjust your gear, pacing, and strategy.

Forecast shift alerts (temp, wind, rain)
Updates as weather changes leading up to race day
Max one message per day
Text Alerts

USA, UK, and Canada only. Standard rates apply.

or
Email Alerts

By subscribing you agree to receive race forecasts and racecast.io updates.

Submit a correction

Spot something wrong or missing for the City of Trees Marathon? Let us know and we'll update it.

You Need an Account For That

Setting up a racecast.io account will allow you to start building a reputation in the community. Over time you'll be able to rate races, join the discussion, and post in the community.

Right now we are invite only, you can get on the waitlist by entering your email below:

OR

Submit a race

Missing a race? Send it in and we'll add it to Racecast.