The Trailbreaker

Waukesha, WI, USA · April 4, 2027·
partly-cloudy-day37°·43° high·Breezy·Dry
9
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Race Day Weather

partly-cloudy-day
37°at start
45° high
Breezy
Dry
Your goal
0:00:00

Cool start, gradual warming

Runners will face temperatures starting at 37°F and rising to 43°F by race's end. A moderate NNW wind at 13 mph will create headwinds from miles 7-11, requiring strategic pacing adjustments during these segments. With humidity at 67%, hydration will be key, especially as temperatures increase. Given the potential for a feels-like temperature of 29°F pre-race, a throwaway layer may be beneficial for warmth.

Race day forecast available in 140 days
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Pace Calculator

26.2mi
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Race Plan

Get your personalized The Trailbreaker 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 Trailbreaker is a spring race in Waukesha, Wisconsin, with a marathon, half marathon, 10K and 5K. The USATF-certified marathon starts at the Schuetze Recreation Center and runs about 6 miles on city streets and 20 miles on paved trail, including the Fox River Trail and the Glacial Drumlin Trail, on a flat course. The race is a Boston qualifier. The Park Foundation of Waukesha hosts it as a fundraiser for city parks, trails and recreation programs. Source

Race weekend

Sunday, April 4
7:45 AMKiddos 1K (0.6 mi)
8:00 AMMarathon (26.2 mi)
8:00 AMHalf Marathon (13.1 mi)8:15 AM10K (6.2 mi)8:15 AM5K (3.1 mi)

FAQ

When is the 2027 The Trailbreaker?

The 2027 The Trailbreaker will be held on Sunday April 4, 2027.

Is the The Trailbreaker a Boston Marathon Qualifier?

Yes, the The Trailbreaker is an official Boston Marathon qualifier.

What will the weather be like for the 2027 The Trailbreaker?

The forecast calls for a high of 48°F and a low of 36°F with a 13% chance of rain. Check our detailed hourly forecast above for the best marathon race plan.

Historical Weather

Based on 6 years of data
Avg Temp
42°F
L:39° H:45°
RunScore
9
Conditions
Rain Freq
50%
3 of 6 yrs
Wind10mph
Dew31°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2026
partly-cloudy-day
42°/56°-
9
2025
partly-cloudy-day
35°/43°-
10
2024
partly-cloudy-day
42°/45°Light
9
2023
cloudy
35°/36°Light
9
2022
cloudy
34°/38°Light
10
2019
cloudy
46°/52°-
10