CAI - Illinois Family 5k 2026
- Date
- Saturday, October 10, 2026
- Start time
- 8:00 AM start (Chicago)
- Location
- Oak Brook, Illinois
- Entry fee
- From $70
- Included with entry
- Includes a shirt
Registration is open.
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Events and entry fees
| Event | Distance | When | Entry fee | Cap |
|---|---|---|---|---|
| 5k | 5K | Oct 10, 20268:00 AM | $70 | – |
Entry fees exclude processing fees. Prices and dates come from the race's registration page and refresh nightly.
Race day planning
Entry fee schedule
- $70 until Oct 10.
Online registration closes Oct 10, 2026, unless the race fills first.
How the price compares
At $70, entry is about 100 percent above a typical 5K in Illinois, which costs $35 right now.
What a typical finish looks like
A typical finisher at a 5K in Illinois runs 35:55, about 11:34 a mile, based on 426 races with published results. Women typically finish in 40:13 and men in 31:16.
Light and altitude
Sunrise on race morning is at about 6:56 AM, and the 5k starts at 8:00 AM. The start sits about 670 feet above sea level.
Fees exclude processing fees. Comparisons use current entry fees and published results from races nearby.
Start location and course
1315 Kensington Road, Oak Brook, IL 60523
The pin marks the address the race lists, which is usually the start. The organizers have not shared a course map with us yet.
2025 results
All resultsAggregated from official results for CAI - Illinois Family 5k. Individual finisher names are not stored here.
How fast do you need to be at CAI - Illinois Family 5k?
In 2025, the fastest tenth finished in 32:39 or better, the top quarter in 43:02, and half the field in 53:33; the last tenth came in after 1:02:03.
| Age | Women | Men |
|---|---|---|
| Under 20 | 52:06 | 34:03 |
| 30-39 | 45:55 | n/a |
| 40-49 | 37:06 | 31:48 |
| 50-59 | 53:00 | n/a |
Groups with fewer than five finishers are left out. Awards vary by race; check the race's rules.
What would my time get me?
Where a finish time would have placed in 2025.
How fast is it?
Slower than most Illinois 5Ks
The fastest quarter of the 2025 5K field finished under 43:02, against 28:26 in a typical Illinois 5K, so times here run 51 percent slower.
Compares the fastest quarter of each field, so walkers and first-timers do not skew it. It reflects the course and the field together: a flat course, cool weather, or a competitive crowd all make times faster.
Typical race-day weather
Around October 10 the day usually runs from 51°F at dawn to 67°F in the afternoon, with measurable rain on about 21% of days. Cold snaps dip to 37°F and hot years reach 80°F.
Based on 75 days within a week of the date over the last 5 years, from historical weather for the start area. Not a forecast.
Race details
- Where
- 1315 Kensington Road, Oak Brook, IL 60523Map
- Course
- Road
- Start elevation
- About 670 feet
- Included with entry
- T-Shirt
- Distances
- 5K
- Editions
- 2026 (Oct 10, 2026), 2025 (Oct 11, 2025)
Organize this race? Add details or a correction
Plan your race
Quick answers
- When is CAI - Illinois Family 5k?
- Saturday, October 10, 2026, starting at 8:00 AM.
- How much does it cost?
- Entry starts at $70 before processing fees.
- When does registration close?
- Online registration closes Oct 10, 2026, unless the race fills first.
- Is the entry fee high for Illinois?
- At $70, entry is about 100 percent above a typical 5K in Illinois, which costs $35 right now.
- Do runners get a shirt or medal?
- Entry includes a shirt, according to the race's registration page. Check it for sizes and whether kids' races get the same.
- What distances can I run?
- 5K.
- How big is it, and how fast?
- In 2025, 71 runners finished the 5k; the median finish was 53:33 and the winner ran 24:16.
- Is it a fast course?
- The fastest quarter of the 2025 5K field finished under 43:02, against 28:26 in a typical Illinois 5K, so times here run 51 percent slower.
- Where does it start?
- 1315 Kensington Road, Oak Brook, IL 60523.
From the organizers
Click here for all race details.