Mill Race Half Marathon

Columbus, IN, USA · September 25, 2027·
partly-cloudy-day61°·63° high·Light·Dry
6
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Race Day Weather

partly-cloudy-day
61°at start
78° high
Light
Dry
Your goal
0:00:00

Comfortable temps, big temp swing

Starting at 61°F, heat will be a factor from the gun — go out conservative and stay on top of hydration. Temps will climb significantly to 78°F by later miles, so expect fading conditions as the race progresses. Light winds shouldn't be a major factor for pacing. Moderate humidity at 67% is worth noting for effort level, especially in later miles.

Race day forecast available in 328 days
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Pace Calculator

13.1mi
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Race Plan

Get your personalized Mill Race 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 Mill Race Half Marathon covers 13.1 miles on shaded park trails and smooth roadways through historic downtown Columbus, Indiana. It starts and finishes downtown, and the course has minimal elevation gain, which makes it a popular choice for personal-best attempts. Columbus is known for its modernist architecture, and the route passes several of the city's landmark buildings. The half runs on the Saturday of race weekend alongside the marathon and 5K.

Race weekend

Saturday, September 25
7:30 AMMarathon (26.2 mi)
7:30 AMHalf Marathon (13.1 mi)
7:30 AM5K (3.1 mi)

FAQ

When is the 2027 Mill Race Half Marathon?

The 2027 Mill Race Half Marathon will be held on Saturday September 25, 2027.

What will the weather be like for the 2027 Mill Race Half Marathon?

The forecast calls for a high of 78°F and a low of 59°F with a 13% chance of rain. Check our detailed hourly forecast above for the best half marathon race plan.

Historical Weather

Based on 12 years of data
Avg Temp
60°F
L:59° H:62°
RunScore
7
Conditions
Rain Freq
17%
2 of 12 yrs
Wind5mph
Dew56°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2026
clear-night
49°/53°-
10
2025
clear-night
53°/60°-
8
2024
rain
66°/66°Light
5
2023
clear-night
55°/60°-
8
2022
rain
55°/56°Light
8
2019
partly-cloudy-night
68°/72°-
4
2018
clear-night
59°/59°-
7
2017
clear-night
65°/71°-
5
2016
partly-cloudy-night
66°/70°-
5
2015
cloudy
63°/64°-
6
2014
clear-night
55°/59°-
8
2013
clear-night
51°/58°-
9