The 2026 event has concluded.

Champlain Islands Marathon

South Hero, VT, USA · October 18, 2026
clear-day38°·55° high·Windy·Dry
7
Register

Race Day Weather

clear-day
38°at start
57° high
Windy
Dry

Cool temps, moderate winds ahead

Runners will face starting temperatures around 38°F, climbing to 57°F by the finish. Winds will be moderate at 18 mph from the SE, providing a mix of headwind and tailwind throughout the course. With humidity around 60%, pacing should remain conservative, especially in the early laps as temperatures rise. A light layer may be beneficial during pre-race warm-ups to combat the chill.

partly-cloudy-night7
cloudy7
cloudy7
cloudy7
clear-day7
clear-day7
clear-day6
clear-day7
clear-day7
clear-day7
clear-day8
clear-day7

Pace Calculator

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

Get forecast alerts for Champlain Islands 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 USATF-certified (VT24002JK) marathon and half marathon begin and end at Folsom Elementary School in South Hero, VT, near the former home of Clarence H. DeMar, seven-time Boston Marathon winner. The half marathon course is out and back along the west shore of South Hero and Grand Isle, through farms, apple orchards, and summer cottages, with flat to rolling, entirely paved terrain. The marathon is two laps of the half marathon course. Start/finish elevation is about 190 feet, with a high point of 210 feet (miles 1 and 25) and a low point of 100 feet. The marathon cutoff is 6 hours; the half marathon cutoff is 4 hours. The course qualifies for Boston Marathon entry. The race was formerly named the Green Mountain Marathon; its current certification (VT24002JK) supersedes the earlier certification issued under that name. Wikipedia

FAQ

When is the 2026 Champlain Islands Marathon?

The 2026 Champlain Islands Marathon will be held on Sunday October 18, 2026.

Is the Champlain Islands Marathon a Boston Marathon Qualifier?

Yes, the Champlain Islands Marathon is an official Boston Marathon qualifier.

What is the time limit for the Champlain Islands Marathon?

The time limit for the Champlain Islands Marathon is 6 hours.

What will the weather be like for the 2026 Champlain Islands Marathon?

The forecast calls for a high of 57°F and a low of 28°F with a 0% chance of rain.

Historical Weather

Based on 14 years of data
Avg Temp
58°F
L:48° H:58°
RunScore
8
Conditions
Rain Freq
14%
2 of 14 yrs
Wind11mph
Dew41°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2026
cloudy
42°/55°-
7
2025
clear-day
49°/70°-
7
2024
partly-cloudy-day
45°/64°-
8
2023
cloudy
46°/47°Light
8
2022
clear-day
45°/58°-
9
2021
cloudy
51°/59°-
9
2019
clear-day
50°/59°-
9
2018
partly-cloudy-day
44°/56°-
9
2017
clear-day
62°/71°-
6
2016
partly-cloudy-day
52°/57°-
8
2015
partly-cloudy-day
50°/62°-
8
2014
clear-day
46°/54°-
9
2012
rain
45°/49°Light
8
2011
cloudy
52°/57°-
9