Loud Thunder 50
Illinois City, IL
50 mi, 50K, Half Marathon
Key dates
Registration opens
Jul 31, 2026
Registration closes
May 13, 2027
Race day
May 15, 2027
Email me updates about MammothMarch Illinois
Registration openings and major changes, like a new date or a cancellation.
Entry transfers
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Listed from Race Roster. Checked Oct 31, 2026.