City of Trees Marathon

Boise, ID, USA · October 10, 2027·

49°·61° high·Breezy·Dry

Weather

City of Trees Marathon race day weather

49°at start

66° high

Breezy

Dry

Your goal

0:00:00

to see the forecast where you'll be

Cool start, gradual warm-up

Runners will face a temperature trend from 49°F at the start to 61°F at the finish. Wind will be light from the NNW at 9 mph, with gusts reaching 19 mph. With low humidity at 42%, conditions are favorable, but runners should remain mindful of the gradual warming and adjust their pace accordingly.

Race day forecast available in 319 days

6 AM

7 AM

8 AM

9 AM

10 AM

11 AM

12 PM

1 PM

2 PM

3 PM

4 PM

Pre-raceRace windowPost-race

Pace Calculator

Distance: 26.2mi

Finish time

0:00:00

HH:MM:SS

Pace

—

Enter a finish time to see what race day does to it.

Pace

—

Enter a finish time to see your race-day finish and True Effort, with what the weather, wind and hills do to it.

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.

About the City of Trees Marathon

The City of Trees Marathon is held each October in Boise, Idaho, with a marathon, half marathon, 10K and 5K. The courses use the Boise Greenbelt, and in 2026 the start and finish were at Boise State University Stadium. The race is organized by the Boise nonprofit SoleKIDs and has a 6-hour marathon limit.

Website

Race weekend

Sunday, October 10

8:00 AMMarathon (26.2 mi)

8:00 AMHalf Marathon (13.1 mi)8:30 AM10K (6.2 mi)

8:30 AM5K (3.1 mi)

Course Map

City of Trees Marathon FAQ

When is the 2027 City of Trees Marathon?

The 2027 City of Trees Marathon will be held on Sunday October 10, 2027.

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 2027 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.

What is the weather usually like for the City of Trees Marathon?

Over the 5 years racecast.io has race-day weather for (2022 to 2026), it averaged 49°F at the start and 60°F by a typical finish. It has not rained during race hours in any of those years.

What was the hottest City of Trees Marathon?

Of the 5 years on record, 2024 was the warmest, reaching 67°F during race hours. The coldest start was 2026, at 45°F.

What was the windiest City of Trees Marathon?

Of the 5 years on record, 2026 was the windiest, with wind averaging 13 mph during race hours. The calmest was 2024, at 3 mph.

City of Trees Marathon weather history

Based on 5 years of data

Avg Temp

54°F

L:48° H:60°

RunScore

Conditions

Rain Freq

0 of 5 yrs

Wind8mph

Dew33°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2026 City of Trees Marathon Partly cloudy throughout the day with late afternoon rain. 2026	45°/51°	-	28°
2025 City of Trees Marathon Clear conditions throughout the day. 2025	46°/54°	-	36°
2024 City of Trees Marathon Clear conditions throughout the day. 2024	51°/67°	-	36°
2023 City of Trees Marathon Partly cloudy throughout the day. 2023	53°/64°	-	40°
2022 City of Trees Marathon Clear conditions throughout the day. 2022	47°/65°	-	24°

More Idaho Races

Boise Half

2026-11-14 · 21.100km · Boise, ID, USA

Famous Idaho Potato Marathon

2027-05-15 · 42.200km · Boise, ID, USA

Boise Marathon

2027-06-20 · 42.200km · Boise, ID, USA

Mesa Falls Marathon

2027-07-17 · 42.200km · Ashton, ID, USA

Idaho Falls Marathon

2027-07-24 · 42.200km · Idaho Falls, ID, USA

Pocatello Marathon

2027-09-04 · 42.200km · Pocatello, ID, USA

Free guidesMarathon Fueling Guide·Carb Loading Guide·Race Morning Guide·Race Day Gear Guide·Pacing Strategy Guide·Mental Strategy Guide