_ The 14th Annual F^3 Lake Half Marathon & 5k presented by Physicians Immediate Care:
Next year we will return to Soldier Field's United Club! Early bird registration is now open for a two weeks only. Registration will close after two weeks and then re-open during the summer. Sign up now to guarantee your spot at the lowest price.
The 14th 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 which features splits every 5km. A must for anyone preparing for a spring marathon, or just resolving to stay fit throughout the new year.