Champlain Islands Marathon

South Hero, VT, USA · October 18, 2026
partly-cloudy-day42°·54° high·Light·Dry
8
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Race Day Weather

partly-cloudy-day
42°at start
55° high
Light
Dry

Cool start — fast day potential, warming through the race

A cool 42°F at the start line is ideal for fast times — expect to warm up quickly once you're moving. Temperatures rising to 55°F through the course will gradually increase perceived effort in the second half. Light winds shouldn't be a major factor for pacing. Moderate humidity at 70% is worth noting for effort level, especially in later miles.

Race day forecast available in 23 days
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Distance: 26.2mi
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Race Plan

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T-Minus
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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

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 42°F with a 17% chance of rain.

Historical Weather

Based on 13 years of data
Avg Temp
59°F
L:49° H:59°
RunScore
8
Conditions
Rain Freq
15%
2 of 13 yrs
Wind10mph
Dew41°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
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