⏵ Course guide · The flattest of the majors
Chicago runs a single flat loop through 29 neighborhoods, start and finish in Grant Park, and it is fast enough to have hosted multiple world records. I will walk you through the corral and wave system and the lottery entry first, then give you a pacing plan built for a course whose flatness is more of a trap than it looks, plus free tools to dial in your own numbers.
These facts come from chicagomarathon.com and public race reporting. Confirm the current-year lottery timeline, corral assignment, and cutoff details on chicagomarathon.com before you commit.
The single loop threads 29 neighborhoods with almost no net elevation change, a handful of short underpass dips and rises being the only real terrain to speak of.
Chicago's flat profile is exactly why it is one of the fastest marathon courses in the world: Kelvin Kiptum ran 2:00:35 here in 2023, and Ruth Chepng'etich set the women's world record here in 2024. The only meaningful climb on the entire course is a small rise on Roosevelt Rd in the final 400 meters, which is more of a late-race gut check than a real hill.
A flat course removes the natural pacing discipline that hills impose. Early miles through downtown can also cause GPS drift from the tall buildings, so your watch pace may lie to you right when the temptation to go out fast is highest. Trust an effort-based check in the first few miles rather than chasing a GPS number through the skyscrapers.
Chicago fills most of its field through a non-guaranteed lottery drawing held in the winter or spring before race day. If the lottery is not for you, Chicago also offers guaranteed entry through age-graded time qualifying standards, charity fundraising with an official partner, legacy status for runners with multiple prior finishes, and international tour operator packages.
Chicago runs three waves, 7:35, 8:00, and 8:35 a.m., each containing a set of lettered corrals seeded by your submitted proof of time.
There are 13 corrals total, lettered A through N with no corral I. Corrals A-E run in Wave 1, F-J in Wave 2, and K-N in Wave 3. Your corral assignment comes from the proof of time you submit when you register, so a faster recent race result gets you a closer start to the front.
The 6 hour 30 minute time limit runs on net chip time, from the moment you personally cross the start mat. That means Wave 3 runners are not penalized for waiting through Waves 1 and 2, your clock only starts when you do. Chicago also runs official Nike pace teams across a wide range of goal times, a resource worth using if you want company through the flat middle miles.
A flat course has no hill to force you back to sensible effort. That freedom is exactly what gets runners into trouble here.
Because there is no terrain to slow you down, the discipline has to come from your own plan. A pace target built off your recent training and current fitness, not just a round number that feels good on race morning, keeps you from spending your first half's advantage on miles you cannot hold in the second half.
Chicago runs official Nike pace teams across a wide range of finish times. If you have mostly raced hillier courses, or you know you tend to go out fast when nothing is slowing you down, running with a pace group here removes the guesswork and keeps you honest through the flat middle of the race.
⏵ Free tools to pace this course
⏵ Train for it with Summit Line
Get a race-day plan built around YOUR fitness, this flat course profile, and your projected splits. Summit Line reads your real training, builds a plan for even, disciplined pacing, and rehearses your fueling so race day is something you execute, not guess at.
Yes, and it is one of the flattest big-city marathons anywhere. The single loop runs through 29 Chicago neighborhoods with only a few hundred feet of total gain across the whole route, mostly gentle rollers and short highway underpass dips. The closest thing to a hill on the entire course is a small rise on Roosevelt Rd in the final 400 meters before the finish. This flatness is exactly why Chicago has hosted multiple world records, including Kelvin Kiptum's 2:00:35 in 2023 and Ruth Chepng'etich's women's world record in 2024.
Chicago runs three waves: Wave 1 at 7:35 a.m., Wave 2 at 8:00 a.m., and Wave 3 at 8:35 a.m. Inside those waves are 13 lettered corrals, A through N with no corral I, seeded by the proof of time you submit during registration. Corrals A through E fall in Wave 1, F through J in Wave 2, and K through N in Wave 3. Because the 6:30 time limit is measured by your net chip time from when you personally cross the start line, a later wave does not cost you any of your time limit.
The official time limit is 6 hours 30 minutes, roughly a 15:00 per mile pace, and it is measured by net (chip) time, meaning your personal clock starts when you cross the start line, not when the gun goes off for Wave 1. That is a meaningful detail for runners in Wave 2 or 3: you are not penalized for waiting behind earlier waves.
Most entrants go through a non-guaranteed lottery drawing, held in the winter or spring before race day. Outside the lottery, Chicago offers guaranteed entry paths: meeting an age-graded time qualifying standard, charity fundraising with an official partner, legacy entry for runners who have completed the race in multiple prior years, and international tour operator packages. If the lottery is your only path, plan on applying in consecutive years, since it is not guaranteed on a single try.
The flat course is a blessing and a trap. With almost no elevation to slow you down or force a change in effort, it is easy to go out faster than your real fitness supports, especially in the first few miles through the Loop where tall buildings can also cause GPS drift and make your watch pace look off. Set a pace target from your recent training rather than your watch alone, hold it evenly through the flat middle miles, and save something for the closing miles, since a flat course punishes an overpaced first half just as much as a hilly one does, only with less excuse.
Early-to-mid October in Chicago is typically good racing weather, with highs commonly in the 55-65°F range and lows near 45-50°F. It has not always cooperated: 2007 saw temperatures push past 85°F and the race was halted mid-event, and other years have brought cold, windy conditions off Lake Michigan. Check the forecast in race week and adjust your pacing and hydration plan if it runs warmer or windier than typical.
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<a href="https://runsummitline.com/guides/chicago-marathon">The Chicago Marathon course guide</a><iframe src="https://runsummitline.com/embed/race/chicago-marathon" style="width:100%;max-width:420px;height:180px;border:0;" loading="lazy" title="Chicago Marathon course guide by Summit Line"></iframe>This guide is independent and for planning only. The course details, dates, cutoffs, and lottery rules come from public sources and can change year to year, so confirm the current specifics with the official race before you register or run. The pacing advice is general and not medical advice.