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Ultra Marathons found in Illinois in May

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Ultra Marathons in Illinois in May 2025

Find A Race is the US's favourite event listings site. Check out our list of May 2025 Ultra Marathons in Illinois below.

Race Calendar: Ultra Marathons found in May

🚀Boosted

Frontline OCR

Byron, Illinois
24 May 25
$69.90 - $117.60
🚀Boosted

1000 Mile Challenge - 2025 Midwest

Edwardsville, Illinois
01 Jan 25 - 31 Dec 25
$31.74
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Frontline OCR

Byron, Illinois
24 May 25
$69.90 - $117.60

1000 Mile Challenge - 2025 Midwest

Edwardsville, Illinois
01 Jan 25 - 31 Dec 25
$31.74
Showing 1-2 of 2 results