Predict the 2027 Boston Cut-off Time and win a great prize and bragging rights among all your running friends.
Submit Your PredictionSt. Charles, IL
Sunday, September 20, 2026




4.7 Stars from 6 ReviewsThe Fox Valley Marathon offers a fast, scenic road race that winds through the tranquil suburbs west of Chicago, Illinois. The race is a USATF-certified route and a Boston Marathon Qualifier. The flat course has just approximately 90 feet between the high and low points.
The course begins and ends in downtown St. Charles near the edge of Mt. St. Mary Park. From the starting line, the route transitions quickly out of the city sectors to guide runners south along the Fox River, traveling directly through the neighboring historic river towns of Geneva and Batavia before turning back northward to the finish line.
Much of the course is run on the Fox River Trail system, which keeps runners separated from vehicle traffic. Runners cross over multiple pedestrian bridges and pass local landmarks, including waterfront parks, local waterfalls, and an authentic Dutch windmill in Batavia.
A smart pacing strategy centers on locking into a highly consistent pace from the opening miles to fully capitalize on the flat terrain and extensive shade. Because the minor rollers are brief, goal success depends on maintaining a steady state and monitoring hydration, particularly if mid-September temperatures are warm on race day.
Don't waste months of training only to run the wrong pace.
Fox Valley Marathon Pace Bands are adjusted for the specific terrain of the course, your goal time and pacing strategies.
Only $9.99
Race Dates
2027: TBDCourse Information
Profile: Mostly FlatRace Day Weather
Mean Temp.: 63°F (17°C)PR Score & Course Score
PR Score: 97.58Race Size
2026: No ResultsBQ Percentages
2026: N/AMiscellaneous Information
Pace Groups?: Yes
Race Day Temperatures |
High: 69°F (21°C) Low: 63°F (17°C) |
Race Start Conditions |
65°F (18°C) Rain NE 11 mph |
PR Score
|
95.03 (97.58) |
Course Score |
98.92 |
The Fox Valley Marathon was the 138th largest marathon in the U.S. in 2025 based on the number of finishers. In 2024, it ranked as the 143rd largest marathon in the U.S..
In 2025, 3.2% of Fox Valley Marathon finishers achieved Boston Marathon qualifying times. In 2024, 2.4% of finishers qualified for Boston.
Based on its percentage of Boston Qualifiers (BQs), the Fox Valley Marathon ranked 363rd among marathons in the U.S. in 2025 and 384th in 2024. In Illinois, it ranked 9th in 2025 and 10th in 2024. These rankings provide a useful benchmark for runners comparing Boston Marathon qualifying potential across different races.
The Fox Valley Marathon has a Course Score of 98.92, ranking it as the 234th fastest marathon course in the U.S. and the 8th fastest marathon course in Illinois.
Typical race-time temperature and humidity levels are above the ideal range for optimal marathon performance. Combined with the course profile, this gives the Fox Valley Marathon a PR Score of 97.58. The PR Score ranks the Fox Valley Marathon as the 325th best marathon in the U.S. for running a Personal Record (PR) and the 7th best marathon for a PR in Illinois.
Together, these rankings provide a quick snapshot of how the Fox Valley Marathon compares with other marathons in the U.S. and Illinois for speed, PR potential, Boston Marathon qualifying success, and overall participation.
Max Elevation: 743 feet (226m)
Min Elevation: 656 feet (200m)
Elevation Gain: 499 feet (152m)
Elevation Loss: 499 feet (152m)
View available accomodations around the Fox Valley Marathon Finish Line and Course. Book your Reservation now before the best places are sold out.
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I missed my turn :(
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Great!
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Great race
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FANTASTIC RACE! BQ Here
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