Detweiller at Dark on July 24th in Peoria, Illinois, is more than just a five-kilometer race; it's an experience that encapsulates the spirit of historic Detweiller Park and the heart of summer in central Illinois. The event spans over two miles of terrain marked by the park’s winding paths and lush greenery. As runners take to these trails under the watchful gaze of towering trees, they are part of a tradition that has seen thousands of participants push their limits year after year. The air on race day is thick with anticipation and the smell of late summer blooms. The sunlight filters through dense canopies, casting dappled shadows across the forest floor. It’s easy to imagine the thrill as runners lace up their shoes and line up at the starting line, ready for what promises to be a challenging yet exhilarating run. This year marks its 15th edition, with thousands of participants coming together in celebration of fitness, community, and personal achievement. Course & Conditions Detweiller Park serves as the stage for this unique race, where runners navigate through a mix of paved paths and forest trails. The historic park’s layout offers both gentle slopes and slight inclines, making it an ideal venue to test one's endurance. Notable features include the iconic Detweiller Arch at the start/finish line and the scenic loop that winds its way around the lake. Participants will find three distance markers along their journey: 0.5K, 1.5K, and 2.5K. The race begins sharp on July 24th; runners must be aware of the weather conditions expected during this time. The average temperature is a comfortable 24.7°C, though the humidity can make it feel warmer at times with an average of 73.8%. Runners should prepare for occasional gusts from the northwest and pack layers as temperatures may fluctuate. The trail surface is hard and dry, ensuring a smooth run despite potential moisture. It's also worth noting that UV levels will be very high during this race.
Co-Ed HS Open 3mi • Start: 19:00:00 • Fee: $38.53
High School Boys 3mi • Start: 19:00:00 • Fee: $38.53
High School Girls 3mi • Start: 19:00:00 • Fee: $38.53
Jr. High Boys 2mi • Start: 19:00:00 • Fee: $27.88
Jr. High Girls 2mi • Start: 19:00:00 • Fee: $27.88
Kids' Fun Run 800m • Start: 19:00:00 • Fee: Free
Open Race 3mi • Start: 19:00:00 • Fee: $38.53
Logistics Registration for Detweiller at Dark closes on Thursday, July 23rd by 7pm. Interested runners can sign up through the official registration link provided: https://raceroster.com/events/2026/113773/detweiller-at-dark. There is no race day registration allowed; all participants must register in advance. Bib pickup will be held on Friday, July 24th from 5-8pm at the Peoria Area Sports Commission located at 900 N. Main St., Peoria, IL. Participants are required to bring a valid form of identification and their payment receipt to claim their bib number. Parking is available for $10 per vehicle; please pay in cash only. The race start location is at Detweiller Park, near the entrance on 4th Street just off Jefferson St., Peoria, IL. For first-timers, it's important to note that there are no age restrictions except for the Kids' Fun Run, which is open to children aged six and up. A simple map or GPS device will help navigate the park’s layout. The race is a testament to community spirit and athletic prowess; every runner who steps onto those historic trails on July 24th contributes to making Detweiller at Dark one of Peoria's most celebrated events.
Races Offered
Co-Ed HS Open
Jul 24, 2026
straighten
Distance —
3mi
terrain
Type —
Running
timer
19:00
sell
$38.53
High School Boys
Jul 24, 2026
straighten
Distance —
3mi
terrain
Type —
Running
timer
19:00
sell
$38.53
High School Girls
Jul 24, 2026
straighten
Distance —
3mi
terrain
Type —
Running
timer
19:00
sell
$38.53
Jr. High Boys
Jul 24, 2026
straighten
Distance —
2mi
terrain
Type —
Running
timer
19:00
sell
$27.88
Jr. High Girls
Jul 24, 2026
straighten
Distance —
2mi
terrain
Type —
Running
timer
19:00
sell
$27.88
Kids' Fun Run
Jul 24, 2026
straighten
Distance —
800m
terrain
Type —
Running
timer
19:00
sell
Free
Open Race
Jul 24, 2026
straighten
Distance —
3mi
terrain
Type —
Running
timer
19:00
sell
$38.53
Weather History
These values represent the 3-year monthly averages for July in Peoria.
thermostatTemperature
20.0° / 29.5°
wb_sunnyFeels like
21.2° / 30.8°
light_mode
Avg sunshine hours
11h 50m
water_drop
Avg rainfall
3.9 mm
ac_unit
Avg snowfall
—
air
Avg wind speed
9.2 km/h (Light breeze)
opacity
Sweat loss rate
High
terrain
Course conditions
Hard and dry surface
sunny
Max UV Index
Very High (8.0)
humidity_mid
Humidity
73.8%
wb_twilight
Sunrise
05:41
nightlight
Sunset
20:25
About Peoria
Learn more about the host city, Peoria.
Peoria is a city in Illinois and the county seat of Peoria County. It serves as a regional hub for the primarily rural and agricultural center of the state. Peoria is a small but diverse city of approximately 115,000 people that anchors a three-county metropolitan area of nearly 400,000.
