Mount Desert Island Marathon

Bar Harbor, ME, USA · October 18, 2026·
partly-cloudy-day51°·52° high·Windy·Dry
9
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Race Day Weather

partly-cloudy-day
51°at start
54° high
Windy
Dry
Your goal
0:00:00

Cool temps, strategic wind shifts

Runners will face steady temperatures from 51°F at the start, rising slightly to 53°F by the finish. Winds will be a factor, with steady headwinds from miles 8-11 and 19-20, necessitating pacing adjustments during these segments. With humidity at 74%, maintaining hydration will be crucial, especially on the rolling terrain. The cooler conditions should allow for a strong overall performance if runners manage their efforts wisely.

Race day forecast available in 2 days
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Pace Calculator

26.2mi
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Race Plan

Get your personalized Mount Desert Island 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 Mount Desert Island Marathon, Half & Relay is North America’s premier destination road race. The award-winning course features miles of pristine terrain passing tranquil lakes, soaring mountains, sleepy Maine villages, and stunning seaside vistas —including Somes Sound, the only fjord on the Eastern Seaboard— all set against the awe-inspiring backdrop of Acadia National Park in peak fall foliage season. The Marathon and Team Relay start in the world-famous Bar Harbor, while the Half-Marathon starts in picturesque village of Northeast Harbor. All three races finish on the quietside of MDI in the hardworking lobster fishing community of Southwest Harbor. Source

Race weekend

Sunday, October 18
8:00 AMMarathon (26.2 mi)
8:00 AMMarathon Relay (26.2 mi)
8:30 AMHalf Marathon (13.1 mi)

FAQ

When is the 2026 Mount Desert Island Marathon?

The 2026 Mount Desert Island Marathon will be held on Sunday October 18, 2026.

Is the Mount Desert Island Marathon a Boston Marathon Qualifier?

Yes, the Mount Desert Island Marathon is an official Boston Marathon qualifier.

What is the time limit for the Mount Desert Island Marathon?

The time limit for the Mount Desert Island Marathon is 6.5 hours.

What will the weather be like for the 2026 Mount Desert Island Marathon?

The forecast calls for a high of 55°F and a low of 51°F with a 11% chance of rain. Check our detailed hourly forecast above for the best marathon race plan.

Historical Weather

Based on 22 years of data
Avg Temp
49°F
L:45° H:52°
RunScore
9
Conditions
Rain Freq
14%
3 of 22 yrs
Wind9mph
Dew40°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2025
clear-day
41°/56°-
9
2024
cloudy
37°/65°-
8
2023
clear-day
49°/55°-
9
2022
fog
47°/57°-
8
2019
clear-day
43°/50°-
10
2018
clear-day
42°/47°-
9
2017
clear-day
55°/62°-
7
2016
cloudy
51°/57°-
8
2015
clear-day
33°/38°-
9
2014
cloudy
45°/47°-
9
2013
cloudy
54°/60°-
8
2012
rain
44°/52°Light
9
2011
cloudy
55°/56°-
9
2010
clear-day
45°/53°-
8
2009
partly-cloudy-day
38°/42°-
10
2008
clear-day
30°/47°-
10
2007
clear-day
43°/50°-
10
2006
clear-day
43°/52°-
9
2005
rain
48°/52°Light
8
2004
cloudy
52°/55°-
8
2003
partly-cloudy-day
40°/46°-
10
2002
rain
46°/48°Light
10