The Chicago Marathon course
net flat (start and finish at the same height).
The Chicago Marathon is a near-perfect loop: it starts and finishes in Grant Park and gains and loses only about 60 m total across 42 km, almost all of it in tiny river and highway underpasses. It is the second-flattest World Marathon Major behind Berlin and a genuine world-record course. That flatness changes how you pace it. There is no downhill to bank time on and no recovery from the climbs, so your muscles take uniform loading the whole way — which means even pace and even effort are essentially the same thing, and going out too fast in the skyscraper canyons of the Loop is the cardinal error. The single bump worth knowing is the Roosevelt Road bridge at mile 26: a short ~3–4% ramp right before the finish that feels like a mountain on dead legs. Everything else is a discipline test against wind tunnels between the buildings and a long, exposed, crowd-thin stretch on the South and Near-South Side from miles 21–25. If you want to compare your number against an even-pace plan with no course tweak at all, use the generic marathon pace calculator.
Course segments
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The Loop start → River North (0–8K) flat
Skyscraper canyons play havoc with GPS and funnel the wind. The field is huge — hold back; the clock you chase is in the last 10 km, not the first.
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North Side — Lincoln Park & Lakeview (8–16.5K) flat
The fastest, smoothest, most raucous stretch. Lock into goal effort here instead of surging with the crowds.
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Back to downtown — Wells Street (16.5–22K) flat
Into the canyons again, where GPS drifts long; the halfway discipline checkpoint.
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West Loop & UIC (22–28.5K) flat · −5 m
Thinner crowds and sun exposure — the mental low. Hold effort, not pace.
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South Side → Chinatown (28.5–34K) flat
The near-180° turn into Chinatown around mile 21 — the classic wall zone.
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Bronzeville & Michigan Avenue (34–41K) flat · −5 m
Quiet and shadeless — the hardest mental stretch of a flat course.
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Roosevelt Road climb → Columbus Dr finish (41–42.2K) +0.8% · +9 m
The only real hill: a short ~3–4% ramp over the Roosevelt Road bridge at mile 26, then crest, turn left, and ~200 m flat to the line.
Race-day weather
The Chicago Marathon is run in October. A typical race morning is around 50 °F with a dew point near 44 °F (a temperature-plus-dew-point sum of 94), so no heat penalty in a typical year. If the forecast is warmer than usual, slow your goal with the heat-adjusted pace calculator before race day — heat is the most common reason a goal pace falls apart.
How this plan is built
Splits come from an even-effort, grade-adjusted model: your goal time is spread across the course by each segment's energy cost, so you hold the same effort up the hills and down them instead of chasing one flat clock pace. See the generic marathon pace calculator for a course-blind even pace, or browse marathon pace calculators by course for other majors.
Sources
- Chicago Marathon official course & elevation Bank of America Chicago Marathon — official course map and elevation (Grant Park loop, ~60 m total gain/loss, Roosevelt Road finish).
- Course analysis & historical race-day weather Find My Marathon — Chicago Marathon elevation profile and historical October start-time weather.
- Chicago October climate (temperature & humidity) Weather Spark — average October weather for Chicago, Illinois (used to estimate race-morning temperature and dew point).
- Even-effort pacing (grade-adjusted cost) Minetti, Moia, Roi, Susta & Ferretti (2002), “Energy cost of walking and running at extreme uphill and downhill slopes”, J. Appl. Physiol. 93(3): 1039–1046.
- Race-day heat & humidity adjustment Mark Hadley / Maximum Performance Running — temperature + dew-point pace-slowdown method (air temp °F + dew point °F → % slowdown band).
FAQ
Is the Chicago Marathon course flat?
Yes — it is one of the flattest major marathons, gaining and losing only about 60 m total across the whole 42 km, almost all of it in small underpasses. The only noticeable hill is the short Roosevelt Road bridge ramp at mile 26. That is why Chicago is a world-record course and a favourite for chasing a fast time.
What is a good pacing strategy for Chicago?
Run even effort, which on a flat course means an even clock pace — resist the temptation to bank time in the fast, crowd-charged North Side miles. The most common Chicago mistake is going out too hard in the first 10 km among the skyscrapers, then fading on the quiet, exposed South Side from miles 21–25. The split table above holds your pace steady the whole way.
Can I run a Boston qualifier (BQ) at Chicago?
Chicago is not the Boston Marathon, but it is one of the most popular flat, fast courses in the world for chasing a BQ time. Its certified course, deep pacer fields and usually cool October weather make it a top qualifying choice. Check the time you need with the Boston qualifier calculator, then pace it even here.
What is the weather usually like for the Chicago Marathon?
The early-October start is typically around 50 °F with a dew point near 44 °F — close to ideal racing conditions in most years. But Chicago has hot outliers: 2007 was halted in the high 80s °F. If your forecast is warm, slow your goal pace with the heat-adjusted pace calculator linked on this page.
Where is the only hill on the Chicago Marathon?
The Roosevelt Road bridge at about mile 26 (41 km) — a short ~3–4% ramp of roughly 7–9 m right before you turn onto Columbus Drive for the flat finish. It is tiny on paper but arrives with 26 miles in your legs, so the even-effort plan eases your target pace slightly there.
Estimates only. Segment elevations are approximate, drawn from public course profiles, and your real splits depend on fitness, fuelling, weather and pacing discipline on the day. Not medical or coaching advice.