Course
A USATF-certified, mostly flat and fast course along Chicago's lakefront, starting and finishing at Soldier Field. The half marathon runs in self-seeded waves and the course closes 3.5 hours after the start.
Key dates
- !RegistrationOpen now
- !Entries closeThu 28 Jan 2027 · in 14 weeks
- ★Race daySat 30 Jan 2027
About
Experience Chicago's Original Winter Half Marathon at the 17th Annual F^3 Lake Half Marathon & 5k! As one of the few independently-owned large races in Chicago, the F^3 Lake Half Marathon & 5k has become a beloved event in the Chicagoland running community. Every year, thousands of runners gather in the warmth of Soldier Field's United Club before braving the wind and weather along the lakefront course. This event is a must-attend for anyone looking to stay active and fit in the new year or preparing for a spring marathon.
Save F3 Lake Half Marathon & 5K to your season and RunCalendar reminds you the morning entries open and before they close. Free on iPhone, no account needed.
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2026 Woodstock Groundhog Day 5k
Celebrates Groundhog Day in downtown Woodstock
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A confirmed date shows its day; a provisional one shows only its month, because we won't claim a day we don't have. This page is rebuilt every night from the RunCalendar catalogue.