F3 Naperville 5K Run & Walk 2026

The race.

The F3 Naperville Foundation hosts its 8th annual 5K run and walk on September 27, 2026, at St. James Park in Warrenville, Illinois. The course is a USATF-certified 5K on crushed limestone paths through prairie and woods. Participants who register before August 22 receive a limited-edition event t-shirt in men's, women's, and children's sizes. Race day includes free parking at the special event lot adjacent to the start/finish line, with shirt and bib pickup available on September 20 at the Naperville Running Store (10am–2pm) or race morning. A kids' race on a 0.4-mile course follows the 5K for children ages 9 and under. Free crushed ice is provided by Kona Ice for children. All proceeds benefit a non-profit organization to be announced, with registrations being tax-deductible.