Champlain Islands Half Marathon

South Hero, VT, USA · October 17, 2027·
partly-cloudy-day41°·45° high·Light·Dry
10
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Race Day Weather

partly-cloudy-day
41°at start
53° high
Light
Dry
Your goal
0:00:00

Cool start — fast day potential, warming through the race

A cool 41°F at the start line is ideal for fast times — expect to warm up quickly once you're moving. Temperatures rising to 53°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 75% is worth noting for effort level, especially in later miles.

Race day forecast available in 336 days
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Pace Calculator

13.1mi
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Race Plan

Get your personalized Champlain Islands Half Marathon race plan

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.

Race Pace
Weather Splits
Nutrition
Gear & Packing
T-Minus
Carb Tracker
Spectator Guide
Race Band

Race Info

The Champlain Islands Half Marathon runs out and back along the west shore of South Hero and Grand Isle in Lake Champlain, passing farms, apple orchards, and summer cottages. The course is flat to rolling and entirely paved, starting and finishing at Folsom Elementary School in South Hero, near the former home of seven-time Boston Marathon winner Clarence H. DeMar. It is USATF-certified and qualifies for Boston Marathon entry.

Race weekend

Sunday, October 17
8:30 AMMarathon (26.2 mi)
8:30 AMHalf Marathon (13.1 mi)

FAQ

When is the 2027 Champlain Islands Half Marathon?

The 2027 Champlain Islands Half Marathon will be held on Sunday October 17, 2027.

What is the time limit for the Champlain Islands Half Marathon?

The time limit for the Champlain Islands Half Marathon is 4 hours.

What will the weather be like for the 2027 Champlain Islands Half Marathon?

The forecast calls for a high of 57°F and a low of 42°F with a 17% chance of rain. Check our detailed hourly forecast above for the best half marathon race plan.

Historical Weather

Based on 14 years of data
Avg Temp
48°F
L:44° H:52°
RunScore
9
Conditions
Rain Freq
7%
1 of 14 yrs
Wind6mph
Dew40°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2026
cloudy
38°/45°-
10
2025
clear-day
43°/59°-
9
2024
partly-cloudy-day
37°/53°-
10
2023
cloudy
45°/47°-
10
2022
clear-day
39°/50°-
10
2021
partly-cloudy-day
47°/54°-
10
2019
partly-cloudy-day
44°/55°-
10
2018
partly-cloudy-day
38°/48°-
10
2017
partly-cloudy-day
62°/63°-
6
2016
partly-cloudy-day
51°/53°-
10
2015
partly-cloudy-day
47°/51°-
9
2014
clear-day
38°/49°-
10
2012
cloudy
44°/45°Light
10
2011
partly-cloudy-day
50°/53°-
10