18th Annual F^3 Lake Half Marathon & 5k

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The 18th Annual F^3 Lake Half Marathon & 5k is Chicago's Original Winter Half Marathon. Each year, thousands of runners flock to this community-built event, gathering in the warmth of Soldier Field's United Club before tackling wind & weather along a lakefront course that features splits every 5km. A must for anyone preparing for a spring marathon or just resolving to stay fit throughout the new year. F^3 sold out in 2016-2020 and 2023-present. Every registrant will once again receive one of our great hoodies and a medal! We will return to the warm confines of Soldier Field's Unite

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