Prairie State Half Marathon & 10K

Saturday, September 30, 2023 • Long Grove, IL • Course Map

One of a number of half marathon races staged in the state’s northeastern corner for the first time in 2010 (as well as other distances), the Prairie State Half Marathon & 10K makes its 13th annual running in the fall of 2023.

The race unfolds along an out-and-back course that starts and finishes just outside Buffalo Creek Forest Preserve, a gorgeous 1,100-acre park filled with rolling prairies, open green spaces and forested woodlands filled with miles of hiking trails.

Runners start the out-and-back course for the race along Robert Parker Coffin Road, and from there head north to Cuba Road, where they’ll run a long out-and-back stretch.

Next, they’ll head south into the neighborhoods within Buffalo Creek Forest Preserve, before heading back north to Robert Parker Coffin Road for the race finish.

The race organizers describe the course as largely flat throughout the half marathon’s 13.1 miles, owing in large part to its location along bodies of water like the park’s lakes and riverbanks, though runners can expect some mild changes in elevation here and there along the race route.

Organizers note the field size for the race is limited — to 1,000 entrants for the half marathon. The course for the race will be USATF-certified.

Race Weather & Climate

Set in the northeastern corner of Illinois, about a half-hour’s drive north of downtown Chicago, the village of Long Grove typically sees cool to mild weather in September, which has brought record temperatures here as low as 18°F (in 1981) and as high as 90°F (in 1963).

On the day of the race (Sep. 30), the average low is 42°F  and the average high is 65°F.

Course Map

See the race route map for the Prairie State Half Marathon here.

Starting Time

see event website


see event website


To reserve your spot in the fall 2023 running of Long Grove’s Prairie State Half Marathon race, register online at here.

Official Race Website

See more races in: September, Illinois

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