Champlain Islands Marathon

South Hero, VT, USA · October 17, 2027·
partly-cloudy-day41°·50° high·Light·Dry
10
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Champlain Islands Marathon race day weather

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

Cool start, mild afternoon

Runners will face a temperature increase from 41°F at the start to 50°F by race's end. With a light wind from the west at 7 mph, conditions remain manageable, but humidity at 71% could add to perceived effort. To combat the cool morning, runners should consider a throwaway layer for the pre-race period, while pacing adjustments may be necessary as temperatures rise on later laps.

Race day forecast available in 326 days
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Pace Calculator

26.2mi
0:00:00
HH:MM:SS
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Champlain Islands Marathon route and elevation

The Champlain Islands Marathon course has about 828 ft (252 m) of climbing and 828 ft (252 m) of descent, and finishes near the elevation it starts. It is hillier than 69% of the marathon courses racecast.io has mapped, measured by what the hills cost in time. The hardest mile is mile 25, with 113 ft (34 m) of climbing and a 2% average grade.

Biggest climbs

  • Miles 2.5 to 3.4: climbs about 85 ft (26 m).
  • Miles 10.9 to 11.9: climbs about 105 ft (33 m).
  • Miles 24 to 25: climbs about 105 ft (33 m).

What the hills cost

  • 3:30 on a flat course is about 3:31 here (1 minute slower).
  • 4:00 on a flat course is about 4:02 here (2 minutes slower).
  • 4:30 on a flat course is about 4:32 here (2 minutes slower).

Hills only, priced mile by mile on the course map. The pace calculator above adds the race-day weather.

Even-effort splits for a 3:30, 4:00 or 4:30 finish
The Champlain Islands Marathon mile splits at even effort for three finish times, with each mile's climb and descent
MileClimbDescent3:304:004:30
124 ft0 ft8:089:1710:27
212 ft95 ft7:388:449:49
341 ft28 ft8:039:1210:21
460 ft62 ft7:569:0410:12
515 ft44 ft7:498:5610:03
640 ft14 ft8:099:1910:29
728 ft38 ft7:549:0210:10
822 ft39 ft7:529:0010:07
948 ft24 ft8:089:1710:27
1067 ft46 ft8:079:1710:26
1125 ft53 ft7:508:5610:04
1298 ft8 ft8:419:5711:11
130 ft0 ft7:579:0410:12
140 ft0 ft7:569:0410:12
154 ft95 ft7:368:429:47
1642 ft25 ft8:059:1410:24
1757 ft65 ft7:559:0310:10
1827 ft50 ft7:518:5810:05
1940 ft10 ft8:119:2110:32
2022 ft44 ft7:518:5810:06
2128 ft34 ft7:559:0310:10
2245 ft12 ft8:139:2310:34
2362 ft42 ft8:069:1610:25
2410 ft66 ft7:438:499:56
25113 ft8 ft8:5010:0611:21
260 ft24 ft7:518:5810:05
Last 0.20 ft5 ft1:452:002:15

Explore the Champlain Islands Marathon course with the weather and your pace along the route, or compare it with other races.

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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About the Champlain Islands Marathon

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

Champlain Islands Marathon FAQ

When is the 2027 Champlain Islands Marathon?

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

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 2027 Champlain Islands Marathon?

The forecast calls for a high of 57°F and a low of 42°F with a 17% chance of rain.

What is the elevation gain of the Champlain Islands Marathon?

The Champlain Islands Marathon course has about 828 ft (252 m) of climbing and 828 ft (252 m) of descent, and finishes near the elevation it starts. It is hillier than 69% of the marathon courses racecast.io has mapped, measured by what the hills cost in time.

Is the Champlain Islands Marathon hilly?

Moderately. It has about 32 ft (10 m) of climbing per mile. The hardest mile is mile 25, with 113 ft (34 m) of climbing and a 2% average grade. 4:00 on a flat course is about 4:02 here (2 minutes slower).

What is the weather usually like for the Champlain Islands Marathon?

Over the 14 years racecast.io has race-day weather for (2011 to 2026), it averaged 44°F at the start and 56°F by a typical finish. Rain fell during race hours in 1 of those years (2012).

What was the hottest Champlain Islands Marathon?

Of the 14 years on record, 2017 was the warmest, reaching 67°F during race hours. The coldest start was 2024, at 37°F.

What was the windiest Champlain Islands Marathon?

Of the 14 years on record, 2017 was the windiest, with wind averaging 17 mph during race hours. The calmest was 2022, at 3 mph.

Champlain Islands Marathon weather history

Based on 14 years of data
Avg Temp
51°F
L:44° H:56°
RunScore
9
Conditions
Rain Freq
7%
1 of 14 yrs
Wind8mph
Dew40°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2026
cloudy
38°/50°-
9
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