Ultramarathons in Illinois, United States
Find ultramarathons in Illinois, United States. Compare 5 upcoming events by date and location. Open a race guide for the course, recorded editions and official entry information where available.
Events to explore include Fancy Nonsense, Chicago Lakefront Ultras and Paleozoic Trail Runs - Silurian Fall.
5 listed events · 5 with upcoming dates
Upcoming ultramarathons
5 matching events, earliest date first. Entry availability is shown separately.
Fancy Nonsense
USAPalatine, Illinois
Autumn trail races at Deer Grove West. The 2026 event moves from Palos Forest Preserve while trail construction takes place.
· 50K
Race details, entry and past editions →Chicago Lakefront Ultras
USAChicago, Illinois
Autumn ultramarathons on Chicago’s paved lakefront path, starting and finishing at Foster Avenue Beach House.
· 50K
Race details, entry and past editions →Entry information ↗Paleozoic Trail Runs - Silurian Fall
USAPalos Park, Illinois
Trail races on the Sag Valley trails, using a 25K loop of gravel paths and woodland sections. The organiser lists the permit as pending.
· 50K
Race details, entry and past editions →Entry information ↗Frozen Gnome
USACrystal Lake, Illinois
Winter trail races on a challenging 10K loop through Veteran Acres and Sterne’s Woods.
· 50K
Race details, entry and past editions →Entry information ↗Shawnee Hills Trail Races
USAOzark, Illinois
Technical trail ultras through the sandstone hills and forests around Camp Ondessonk.
· 100K / 50K
Race details, entry and past editions →Entry information ↗Race archive
Past races and previous editions
Looking back at a race? Browse the guides below for recorded editions. This section also includes events awaiting a new date and cancelled editions. Previous editions of races in the upcoming calendar are available through their race guides above.
No separate archived race guides are listed for this selection yet.
View full race archive (0) →Choosing a race in Illinois
The unfiltered upcoming calendar includes events in Chicago (1), Crystal Lake (1), Ozark (1). Use the town filter to compare locations, then check the race guide for the start venue and organiser’s travel information.
Questions about ultramarathons in Illinois
Which ultramarathons are coming up in Illinois, United States?
Fancy Nonsense is listed for 24 October 2026. Chicago Lakefront Ultras is listed for 31 October 2026. Paleozoic Trail Runs - Silurian Fall is listed for 7 November 2026. Check the race guide and organiser’s latest information before making plans.
Where can I find race entry details for Illinois, United States?
Follow the link from the race guide to the organiser or entry provider, where one is available. Check the entry deadline, eligibility and current availability there. A listed race date does not necessarily mean entries are still open.
Why has a race moved out of the upcoming calendar?
Once its listed dates have passed, a race moves to the past-editions view unless another upcoming edition is recorded. Cancelled events also leave the upcoming list. The race guide stays available, and the event returns when a new date is added.