Registration for 2025 opens in January!

Click above to verify your registration information

Click above to login to your RunSignUp account. Or email info@f3running.com to switch down to the 5k.

Yes, you should wear a costume. If you would like to go all out, step on up to our stage for costume contest judging which will begin at 7:40am. We will award prizes to the Top 2 costumes in two categories: Individual & Group. Otherwise, keep it low-key with a costume that you can race in. And if you don’t want to race in your costume…

Yes, we will have a gear check. But the usual rules still apply: you get ONE regular sized backpack. So if you don’t want to race with your witches hat or Thor’s hammer, please plan ahead on how you’re going to cram it into your bag. And NO – we will not have room for your cardboard replica Willis Tower costume. You’ll just have to take it back to the car. Speaking of cars…

We encourage all participants to use public transportation whenever possible. CTA and Divvy have numerous stops near Stockton and LaSalle, and there are multiple bus routes in the area. If you are riding with Uber, Lyft, or a super-nice friend, please get dropped off on Stockton north of LaSalle. If you are driving, parking is available in the Chicago History Museum lot, or on Cannon Drive.

The HM and 5k courses will start and finish adjacent to Lincoln Park Grove 2. The HM course will be along the lakefront, southbound toward Ohio Street Beach, before returning to Lincoln Park. The HM course will feature accurately placed mile marks and 4 aid stations. The 5k will follow the same first 1.55 miles as the HM before turning around. All courses are potentially subject to change. All courses will be accurately measured.