Detweiller at Dark

About the Event

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.

thermostat Temperature

20.0° / 29.5°

wb_sunny Feels 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.