Chicago fills its field through several different doors, and figuring out which one fits you is the first real decision in trying to run this race. Unlike races that rely on a single lottery, Chicago runs parallel guaranteed-entry paths alongside its drawing, so it is worth checking every option before assuming the lottery is your only shot.

The Guaranteed Paths and the Lottery

Most runners end up going through one of five general routes into the race: a documented time qualifier, a legacy path for repeat Chicago finishers, an official charity program, an authorized international tour operator, or the non-guaranteed entry drawing that fills whatever spots remain after those categories are accounted for. The first several guarantee your spot if you meet the requirements. The drawing is a random lottery open to everyone else.

Time Qualifiers: The Performance Path

If you have run a certified marathon fast enough for your age and gender division, you can apply as a time qualifier and skip the drawing entirely. Chicago publishes age-graded standards for each division, and the bar gets more forgiving as you move into older age brackets. The qualifying result has to come from a certified course within the event's stated window, so check the current standards and deadlines directly on the official race site rather than relying on a number you saw somewhere else, since standards and qualifying windows have shifted over the years. If your submitted result does not end up meeting the standard, most runners are simply shifted into the lottery pool rather than rejected outright, so there is little downside to trying.

Charity Entries: Fundraising for a Guaranteed Bib

Chicago's official charity program lets you guarantee a bib by committing to fundraise for one of the race's approved nonprofit partners. You pick a partner charity, register through that charity's own team rather than through the general lottery, and commit to raising a meaningful amount over the course of your training, typically in the thousands of dollars. This path suits runners who are motivated by a specific cause and comfortable asking their network for support, and it is worth researching a few charity partners early, since the more popular ones can fill their team roster well before the fundraising commitment window closes for the year.

International Tour Operators: Guaranteed Entry With Travel Included

Runners traveling from outside the United States have another option: authorized international tour operators that sell guaranteed Chicago entries bundled with a travel package, typically including hotel accommodations near the course and organized race-weekend events. This route costs more than the lottery or charity paths and is generally not available to U.S. residents, but it removes the uncertainty of a random drawing entirely for international runners who are already planning a trip around the race.

The Lottery: For Everyone Else

If none of the guaranteed paths fit, you apply to the non-guaranteed entry drawing during its application window, and names are selected at random once that window closes. The mechanics of the drawing itself, how odds actually shake out, when notifications go out, and what to do if you are not selected, deserve their own deeper look, since there is more nuance there than fits into a general overview like this one.

Choosing Your Path

The right path depends mostly on what you already have going for you: a qualifying time in hand, a cause you are willing to fundraise for, an international trip you are already planning, or simply patience for a random drawing. Many runners actually apply to more than one path in the same year, submitting a marginal qualifying time while also lining up a charity backup, since a rejected guaranteed application in most cases simply becomes a lottery entry rather than costing you anything extra. Figure out which combination fits your situation, and apply to every path that is realistically open to you rather than betting everything on one route.

If Chicago is one of several races you are weighing this cycle, RaceRove's Illinois marathon hub is worth a look for comparing it against other races in the state.