Marathons in Illinois 2026-2027

16 marathons and 20 half marathons coming up in Illinois, by date. Rated races show how many minutes the course adds or saves against an average road race, from its climbing, surface and typical race-day weather.

Flattest marathons in Illinois

Rated road races, least total climbing first.

  1. 1.Mississippi River MarathonBettendorf, 66m climbing, -3 min vs average, Feb 2027
  2. 2.Chicago MarathonChicago, 74m climbing, -1 min vs average, Oct 2027
  3. 3.Spring Chance BQ.2 MarathonGeneva, 113m climbing, -6 min vs average, Apr 2027
  4. 4.Last Chance BQ.2 MarathonGeneva, 113m climbing, +3 min vs average, Sept 2027
  5. 5.Fox Valley MarathonSt. Charles, 136m climbing, +2 min vs average, Sept 2027
  6. 6.Illinois MarathonChampaign, 139m climbing, -2 min vs average, Apr 2027
  7. 7.Chicagoland Spring MarathonSchaumburg, 143m climbing, -3 min vs average, May 2027
  8. 8.Quad Cities MarathonMoline, 156m climbing, +3 min vs average, Sept 2027
  9. 9.Belleville Main Street MarathonBelleville, 192m climbing, +6 min vs average, Sept 2027
  10. 10.GO! St. Louis MarathonSt. Louis, 300m climbing, +4 min vs average, Apr 2027

Flattest half marathons in Illinois

Rated road races, least total climbing first.

  1. 1.Life Time Chicago Half MarathonChicago, 16m climbing, -2 min vs average, Sept 2027
  2. 2.Illinois Half MarathonChampaign, 73m climbing, -2 min vs average, Apr 2027
  3. 3.Naperville Women's Half MarathonNaperville, 112m climbing, -1 min vs average, Apr 2027

Marathons in Illinois (16)

Nov 2026

Feb 2027

Mississippi River Marathon

-3 min

Bettendorf, Illinois

6 Feb 2027Road66m gainFull

Mar 2027

Apr 2027

GO! St. Louis Marathon

+4 min

St. Louis, Illinois

10 Apr 2027Road300m gainFull

Spring Chance BQ.2 Marathon

-6 min

Geneva, Illinois

11 Apr 2027Road113m gainFull

Illinois Marathon

-2 min

Champaign, Illinois

24 Apr 2027Road139m gainFull

May 2027

Chicagoland Spring Marathon

-3 min

Schaumburg, Illinois

2 May 2027Road143m gainFull

Sept 2027

Last Chance BQ.2 Marathon

+3 min

Geneva, Illinois

5 Sept 2027Road113m gainFull

Fox Valley Marathon

+2 min

St. Charles, Illinois

19 Sept 2027Road136m gainFull

Belleville Main Street Marathon

+6 min

Belleville, Illinois

26 Sept 2027Road192m gainFull

Quad Cities Marathon

+3 min

Moline, Illinois

26 Sept 2027Road156m gainFull

Oct 2027

Des Plaines River Trail Marathon

+33 min

Libertyville, Illinois

10 Oct 2027Trail144m gainFull

Chicago Marathon

-1 min

Chicago, Illinois

10 Oct 2027Road74m gainFull

Nov 2027

Springfield Marathon

+29 min

Springfield, Illinois

6 Nov 2027Trail88m gainFull

Half marathons in Illinois (20)

Nov 2026

Jan 2027

Feb 2027

Apr 2027

Naperville Women's Half Marathon

-1 min

Naperville, Illinois

11 Apr 2027Road112m gainHalf

Illinois Half Marathon

-2 min

Champaign, Illinois

24 Apr 2027Road73m gainHalf

May 2027

June 2027

July 2027

Sept 2027

Life Time Chicago Half Marathon

-2 min

Chicago, Illinois

26 Sept 2027Road16m gainHalf

Oct 2027

Nov 2027

Marathons in Illinois at a glance

  • Busiest month: Sept 2027, with 8 races.
  • A typical marathon here climbs about 139m in total (the median of 12 rated courses), against about 145m across the USA.
  • Hilliest: GO! St. Louis Marathon, with 300m of climbing (road).
  • Coolest race day on average: F^3 Lake Half Marathon & 5k (Jan 2027, a typical high of -3°C). Warmest: Run for Heroes Half Marathon, 10K, 5K hosted by Revive Vienna (May 2027, 26°C).

Marathons in other states

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