Short review
Welcome to the Wisconsin Trail Assail Series!
Join us for seven races over seven months, culminating in a series-ending championship. These races take place in Waukesha County and Wisconsin State Parks, offering scenic courses for all fitness levels. Each event features 5K, 10K, and Half Marathon distances, and the series is walker-friendly!
New for 2025 - Rucking!
What is rucking?
Rucking is a physical activity that involves walking or hiking with a weighted backpack (called a rucksack). The term comes from the military, where soldiers train and operate carrying heavy loads over long distances. In civilian fitness and recreation, rucking is gaining popularity as a versatile and low-impact workout. We now offer it at all Wisconsin Trail Assail Events!
More information about rucking.
Series Registration:
Select your distance during registration (5K, 10K, or Half Marathon).Don’t worry—you can switch distances for free at any time!Please note: series registrations are non-deferrable.Single Race Registration:
Want to participate in individual events? Click on the specific race link below to register for that event.
Kiddo's 1K Registration:
Our Kiddo's Races are always free! If your little one wants to join the fun, please register them for the individual Kiddo's race of your choice.
Get ready to explore the trails, challenge yourself, and have a blast with the Wisconsin Trail Assail Series! 🌲👟
Registration open
Register nowRoad Running , Walk
Distance:
Half-marathon
Organized since 2016
Short review
Welcome to the Wisconsin Trail Assail Series!
Join us for seven races over seven months, culminating in a series-ending championship. These races take place in Waukesha County and Wisconsin State Parks, offering scenic courses for all fitness levels. Each event features 5K, 10K, and Half Marathon distances, and the series is walker-friendly!
New for 2025 - Rucking!
What is rucking?
Rucking is a physical activity that involves walking or hiking with a weighted backpack (called a rucksack). The term comes from the military, where soldiers train and operate carrying heavy loads over long distances. In civilian fitness and recreation, rucking is gaining popularity as a versatile and low-impact workout. We now offer it at all Wisconsin Trail Assail Events!
More information about rucking.
Series Registration:
Select your distance during registration (5K, 10K, or Half Marathon).Don’t worry—you can switch distances for free at any time!Please note: series registrations are non-deferrable.Single Race Registration:
Want to participate in individual events? Click on the specific race link below to register for that event.
Kiddo's 1K Registration:
Our Kiddo's Races are always free! If your little one wants to join the fun, please register them for the individual Kiddo's race of your choice.
Get ready to explore the trails, challenge yourself, and have a blast with the Wisconsin Trail Assail Series! 🌲👟
19 Road Running races on 11 — 18 October 2025 in Oconomowoc
WTA Half Series
April 13, 2019
The race starts at 08:0021 km
from $165
WTA Half Series
April 11, 2020
The race starts at 08:0021 km
from $170
WTA Half Series
April 17, 2021
The race starts at 08:0021 km
from $165
WTA Half Series
April 13, 2024
The race starts at 09:0021 km
from $205
WTA Half Series
April 11, 2025
The race starts at 09:0021 km
from $205
WTA 5K Series
April 13, 2019
The race starts at 08:00
from $165
WTA 10K Series
April 13, 2019
The race starts at 08:00
from $165
Kids 1K Run
April 13, 2019
The race starts at 07:45
from $0
WTA 5K Series
April 11, 2020
The race starts at 08:00
from $170
WTA 10K Series
April 11, 2020
The race starts at 08:00
from $170
WTA 5K Series
April 17, 2021
The race starts at 08:00
from $165
WTA 10K Series
April 17, 2021
The race starts at 08:00
from $165
Kiddo's 1K
April 17, 2021
The race starts at 08:00
from $70
WTA 5K Series
April 13, 2024
The race starts at 09:00
from $205
WTA 5K Walk Series
April 13, 2024
The race starts at 09:00
from $205
WTA 10K Series
April 13, 2024
The race starts at 09:00
from $205
WTA 5K Series
April 11, 2025
The race starts at 09:00
from $205
WTA 5K Walk Series
April 11, 2025
The race starts at 09:00
from $205
WTA 10K Series
April 11, 2025
The race starts at 09:00
from $205
Weather for Apr 11, 2025
°F
Wind: m/s.
.
Very Good for running
Past weather
Apr 15, 2017
56.45 °F, wind 3.43m/s
Light rain overnight..
Apr 14, 2018
38.65 °F, wind 7.13m/s
Light rain starting in the afternoon..
Apr 13, 2019
51.36 °F, wind 0.95m/s
Partly cloudy throughout the day..
Apr 11, 2020
51.37 °F, wind 9.27m/s
Partly cloudy throughout the day..
Apr 17, 2021
52.98 °F, wind 9.56m/s
Partly cloudy throughout the day..
Apr 16, 2022
43.94 °F, wind 15.33m/s
Mostly cloudy throughout the day..
Apr 15, 2023
°F, wind m/s
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Apr 13, 2024
°F, wind m/s
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Mar 31, 2025
°F, wind m/s
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