When in October are most 10K races held?
The busiest weekend in Illinois is October 17 and October 18, with 5 10K races on those two days, and the single busiest day is Saturday, October 17 with 3. Every one of them is on a Saturday or a Sunday.
Race calendar · October 2026 · Illinois
October 2026 10K Races in Illinois
Every 10K in Illinois in October 2026, all 15 of them, sorted by date. Dates, entry fees, finish-time stats from past results, and start-line maps.
15 10K races in October 2026
What the field actually runs
October 10K Races, By the Numbers
1:03:49Median finish time
40:54Median winning time
32Median field size
3October 10K races with published results
How we calculate these stats: RunSesh calculates these figures from the most recent published results of past editions, sourced from RunSignup. We show aggregates only: field size, winning and median times, and the cutoff. We never publish individual finisher tables. Last updated Sep 22, 2026.
When in October
The October Race Weekends
10K races do not spread evenly across October. The busiest weekend is October 17 and October 18, with 5 of them.
By the numbers
The Biggest and Longest-Running
The October 10K races that stand out on the numbers: the biggest field, and the longest unbroken run of editions.
October 10K Races by City
Soonest 10K Races in October
15 total Sat, Oct 3, 2026Long Grove's Oktoberfest Half Marathon, 10K & 5K Long Grove, ILFrom $45Details Sun, Oct 4, 2026Nancy M. Kapheim Memorial Classic Rock Island, ILFrom $35Details Sat, Oct 10, 2026Cookie Run 5K/10K/13.1 CHICAGO/EVANSTON Chicago, ILFrom $30Register Sat, Oct 10, 2026Coffee Lovers Run 5K/10K/13.1 CHICAGO/EVANSTON Chicago, ILFrom $30Register Sat, Oct 17, 2026Chicago Fall Classic Half Marathon, 10K & 5K Chicago, ILFrom $13Details Sat, Oct 17, 2026Run Stephenson County Orangeville, ILRegistration closedPricing TBADetails Sat, Oct 17, 2026JMH 5K/10K Jacksonville, ILFrom $32Details Sun, Oct 18, 2026Richardson Farm Fall 5K & 10K with Family 1 Mile Adventure Run Spring Grove, ILFrom $13Details Sun, Oct 18, 2026Frank Lloyd Wright Races Oak Park, ILFrom $41Details Sat, Oct 24, 2026Batavia United Way Bat Race 5K & 10K Batavia, ILFrom $30Details Sun, Oct 25, 2026Tri-State Warrior Run Quincy, ILFrom $30Details Sun, Oct 25, 2026Spooky Sprint - Greater Chicago Shorewood, ILFrom $22Details
Common Questions About Running an October 10K in Illinois
When should I sign up for an October 10K?
As early as you can. 2 of these October 10K races already have a price increase on the calendar, and 14 are open for entry right now.
How much does an October 10K cost to enter?
The typical entry is $30, with paid entries running from $12.99 up to $44.99. Entry fees climb as race day gets closer, so the same race is usually cheapest the week it opens.
What is a good 10K time?
Across the 3 of these October 10K races with published results from past editions, the median finisher ran 1:03:49, and the median winning time was 40:54. So anything under 1:03:49 puts you in the faster half of a typical field. That is the middle of these RunSignup fields, walkers and charity entrants included, not a national average.
How big is a typical October 10K field?
The median one finished 32 runners, across the 3 of these October 10K races with published results from past editions. Most are far smaller than the big-city events people picture, which means less crowding at the start and a friendlier field, with a last recorded finisher at 1:37:08.
Are there trail 10K races in Illinois in October?
Yes, one race around Illinois gets you off the pavement: 1 mixes road and trail. Surfaces are not always published, so it is worth checking a specific race before you register.
10K Races in Other Months
September and November sit either side of October, which is where most people look next when a date does not fit.