Champlain Islands Marathon

South Hero, VT, USA · October 18, 2026·
partly-cloudy-day42°·52° high·Light·Dry
10
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Race Day Weather

partly-cloudy-day
42°at start
54° high
Light
Dry
Your goal
0:00:00

Cool conditions, gradual warming

Runners will face a cool start at 42°F, with temperatures gradually rising to 54°F by the finish. Winds will be light, averaging around 8 mph, with moderate gusts, but won't significantly impact performance. With average humidity at 69%, pacing adjustments may be necessary during the later laps as temperatures increase. A light throwaway layer may be advisable for the pre-race warm-up due to the cooler feels-like temperature.

Race day forecast available in 2 days
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Pace Calculator

26.2mi
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Race Plan

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A mile-by-mile breakdown of where your time goes, weather-adjusted splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide, all built around your goal and race-day conditions.

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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

Race weekend

Sunday, October 18
8:30 AMMarathon (26.2 mi)
8:30 AMHalf Marathon (13.1 mi)

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 56°F and a low of 42°F with a 17% chance of rain.

Historical Weather

Based on 13 years of data
Avg Temp
51°F
L:45° H:56°
RunScore
9
Conditions
Rain Freq
8%
1 of 13 yrs
Wind7mph
Dew41°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2025
clear-day
43°/65°-
7
2024
partly-cloudy-day
37°/60°-
9
2023
cloudy
45°/47°-
10
2022
clear-day
39°/56°-
10
2021
partly-cloudy-day
47°/57°-
9
2019
partly-cloudy-day
44°/57°-
10
2018
partly-cloudy-day
38°/54°-
10
2017
partly-cloudy-day
62°/67°-
5
2016
partly-cloudy-day
51°/56°-
10
2015
partly-cloudy-day
47°/57°-
9
2014
clear-day
38°/53°-
10
2012
cloudy
44°/47°Light
10
2011
partly-cloudy-day
50°/55°-
10