In 5 days · Sat, Oct 24, 2026
Don't let race day sneak up
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Saturday, October 24th, 2026
4100 IL Rt 53, Lisle IL
5K
43–58°F · some rain risk
See last 10 years
On this date: rain 2 of the last 10 years
2025
33–50°F
dry
2024
40–62°F
dry
2023
58–76°F
dry
2022
63–73°F
dry
2021
40–49°F
rain
2020
33–46°F
dry
2019
41–51°F
dry
2018
35–49°F
dry
2017
42–50°F
rain
2016
44–56°F
dry
Best months to race in Illinois →
Race-day ready
Everything but the shoes.
Real running socks, a bib belt, anti-chafe — the cheap upgrades that matter.
Race-day forecast · Saturday, Oct 24
Cloudy · 56–71°F
Saturday, Oct 24starts near 56°F · 0% chance of rain · wind up to 14 mph
About this race
Spend a magical fall morning running or walking through a scenic course with trees just at the cusp of their full autumnal color change. You’ll experience a unique course with rolling terrain along the Arboretum’s East Side, perfect for participants of all levels to help kick off the Fall Color Festival. A virtual 5K option is also available.
Once you’ve conquered the course, stay for a postrace party with live music, food, and a complimentary beer!
Your ticket purchase helps support the Arboretum’s mission to plant and protect trees for a greener, healthier, and more beautiful world.
Line up with everyone at 8:00 a.m. for a shotgun start. Cross by 8:15am if you'd like to go your own pace.
Note: Medals will only be awarded to those who compete in the 8:00 a.m. shot gun start.
Arboretum Members save $10 per registration. The discount will be applied during the registration process after entering your Member number.
Course map
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