These values represent the 3-year monthly averages for July in O'Fallon.
Learn more about the host city, O'Fallon.
O'Fallon is a city in St. Charles County, Missouri, United States. It is part of the St. Louis metropolitan statistical area, located along Interstates 64 and 70 between Lake St. Louis and St. Peters. As of the 2020 census, O'Fallon had a population of 91,316, making it the most populous suburb of St. Louis, as well as the most populous municipality in St. Charles County and the 7th most populous in Missouri. O'Fallon's namesake in St. Clair County, Illinois, is also part of the St. Louis region. The two cities are one of the few pairs of same-named municipalities to be part of the same metro area.
Read more launchRead what other athletes have to say about their experience at the O'Fallon Firecracker Run.
Be the first to share your experience with the community!
Explore other exciting events happening in this same region.
location_on St Charles, Missouri, US
calendar_today Jul 04, 2026
location_on Chesterfield, Missouri, US
calendar_today Jul 04, 2026
Hand-picked events we think you’ll love.
Aug 15, 2026
If you’ve done a traditional 5K, you know they can be a bit lackluster. But the BUBBLE RUN™ is like running through Wil…
Read more
Jul 25, 2026
Join the 5-O 5K Donut Run for a Sweet Cause! 🍩🏃♂️ Presented by McLanahan Towing & Collision and Teklab Inc. Get ready …
Read more
Nov 08, 2026
Mark your calendars and plan to join us on Sunday, November 8, 2026, for our number 1 fundraiser of the year! The Annua…
Read more
Jul 04, 2026
You think you’re good? You think you’re tough? Come try our course…IT’LL EAT YOU UP! The Cannibal is a 5/10/15K run or …
Read more