Logo

Great Western Half-Marathon & 10K

St. Charles, United States • 3 May 2026

Great Western Half Marathon & 10K : Event overview

The Great Western Half Marathon & 10K is organized by Fox River Trail Runners and is scheduled for Sunday, May 3, 2026. The event offers a flat, out-and-back course on the western portion of the Great Western Trail. The trail surface includes limestone and is a rails-to-trails conversion: the Chicago Great Western Railway operated from 1885 to 1968 and the path has been open for public use since 1978. The club has more than 25 years of history hosting this half-marathon and 10K.

Distances and charity support

  • Half-marathon (21.1 km)
  • 10K (10 km)

Fox River Trail Runners donates $5 per participant registration, and participant donations above registration fees are added and split equally among three local non-profit mental health charity partners. In 2025, the club’s $5 per registrant donation combined with participant donations generated a total of $4,000 for those charities. The organizer is a 501(c)(3) not-for-profit corporation. Visit the organization's website for the most recent information.

United States Illinois St. Charles

Race information

Website
Half Marathon
Great Western Half Marathon
10 km
Great Western 10k
Visit the organization's website for the most recent information.
Trail runs nearby

Frozen Gnome

Crystal Lake

Run winter single track in Crystal Lake at the Frozen Gnome on Jan 10, a Triple Black Diamond loop through Veteran Acres. Choose 50K, 10K or 50K relays for teams of 2 or 5 and warm up at the Gnome Depot with hot food and coffee.

50k Mashup Slam

Crystal Lake

Kick off your trail season in Crystal Lake with the 50K MASHUP SLAM on January 10, 2026. Join a Midwest series of challenging 50K and 53K races that reward cumulative finish times and finisher buckles.

Fox Valley Winter Challenge Trail Series

St. Charles

Tackle the Fox Valley Winter Challenge 5K at Dick Young Forest Preserve, the first of a three race trail series that may feature snow, slush or mud. Finishers get a medal and single race entrants receive a cozy winter hat.

Frozen Tundra 5K

Lincolnshire

Chill out and race the Frozen Tundra IPA 5K along the Des Plaines River Trail in Lincolnshire, then warm up at a lively post race party at Half Day Brewing with beer, food and prizes. Limited to 300 spots so register early.