How to pace Chicago.
Chicago is the flattest of the American majors — a loop through 29 neighborhoods that starts and finishes in Grant Park and never climbs more than an overpass. But it has two traps the elevation chart won't show you: skyscrapers that scramble your GPS exactly when adrenaline is highest, and a long, exposed grind up Michigan Avenue when the crowds are gone and the lake wind isn't. Here's the course, mile by mile, and how to race it.
The race
Bank of America Chicago Marathon
Oct 11, 2026 · Chicago, IL
The course
Flat loop · one late overpass
The one rule for Chicago
Don't trust your watch for the first three miles. The Loop's towers make GPS read fast or slow by 20+ seconds — run by feel and the mile-marker clocks until the course opens up.
About 74 m of gain in 26.2 miles. The only hill anyone remembers is the Roosevelt Road overpass — 800 m from the finish.
The course, phase by phase.
Adjustments are relative to your goal pace — pick your goal time in the table further down for the exact splits behind them.
The Loop — GPS canyon
by feel, +10–15 s/miOut of Grant Park and straight into downtown's urban canyon. Your GPS will lie to you here — sometimes by 20–30 seconds per mile in either direction. Ignore it. Run relaxed, let the field carry you, and get your first honest split from the mile 3 marker clock. Starting 10–15 s/mi slow through here is free insurance; starting fast because your watch says 'on pace' is how Chicago races end at mile 22.
▲ Flat · unreliable GPS between the towers
North to Lakeview — lock it in
settle at goal paceUp LaSalle through Lincoln Park, the sky opens and your GPS starts telling the truth again. This is the settling zone: find goal pace, find a pack running your rhythm, and start ticking off boring miles. The Wrigleyville and Lakeview crowds are loud — enjoy them without racing them. First fuel around 40–45 minutes in.
▲ Flattest, most honest stretch of the course
Old Town back downtown — halfway on plan
goal pace · check at halfSouth through Old Town and back toward the towers, crowds building the whole way. Cross halfway at your planned split, not under it — arriving 60–90 seconds 'up' at 13.1 feels like winning and costs you three times that after mile 21. If you feel great, good: feeling great at halfway is the plan, not a signal to press.
▲ Flat · GPS gets patchy again near downtown
West Loop & United Center — corners and wind
goal pace · run the tangentsThe course turns west into its twistiest section — this is where sloppy lines add real distance. Follow the painted blue tangent line corner to corner; running every curve wide is how people's watches read 26.6 miles at the finish. It's also the most wind-exposed half of the course, so if there's a west wind, tuck into a group and share the work.
▲ Flat · most corners on the course
Pilsen & Chinatown — the emotional lift
goal pace · steady effortLittle Italy, Pilsen, then Chinatown at mile 21 — some of the loudest, warmest crowd energy in marathoning, arriving exactly when your legs start asking questions. Use it, but keep the effort flat: the classic mistake is surging to the drums in Pilsen and paying on Michigan Avenue. Your last full gel should go in around mile 18–19, before the hard part.
▲ Flat with short bridge bumps
Bridgeport & the Michigan Ave grind
hold goal pace — this is the raceThe turn north at 35th Street onto Michigan Avenue is where Chicago is decided. It's the quietest, most exposed stretch — long, straight, often into a headwind off the lake, with the skyline visible but never getting closer. Everyone who banked time earlier is walking here. Shorten your focus: one mile at a time, count buildings, count runners you pass. Even pace through this section is worth minutes.
▲ Dead flat, fully exposed, frequent lake headwind
Home straight & Mount Roosevelt
squeeze, then crest the hillCrowds rebuild as you close on Grant Park. At mile 25.8 you meet the only hill in Chicago: the Roosevelt Road overpass — 'Mount Roosevelt' — maybe 10 m of climbing that feels like a mountain on 26-mile legs. Shorten your stride, pump the arms, crest it, then it's one left turn onto Columbus Drive and 200 m of finishing straight. Don't kick before the bridge; kick off the top of it.
▲ Flat, then a ~10 m overpass at 25.8, then 200 m to the line
What blows it up.
Trusting GPS pace in the Loop. The first three miles read wrong between the towers — runners 'holding goal pace' by watch are often 20 s/mi hot. Use the mile-marker clocks.
Banking time before halfway because the course is flat and the crowds are loud. Chicago's second half is where flat-course discipline gets graded.
Running every corner wide in the West Loop. The twisty middle miles quietly add 300–400 m unless you follow the blue tangent line.
Ignoring the weather range. Chicago in October has raced everywhere from near-freezing to 31 °C (2007). Check the forecast and adjust your goal, not just your outfit.
Surging with the Pilsen and Chinatown crowds at miles 18–21, then dying on the silent Michigan Avenue stretch two miles later.
Emptying the tank before Mount Roosevelt. Save your kick for the top of the overpass — it's 800 m from the line, not two miles.
Before the gun
Race-day logistics.
Mid-October Chicago is a lottery: most years land 7–16 °C, ideal for racing, but the tails are real — 2007 hit 31 °C and stopped the race; other years start below freezing. Lake wind matters more than the elevation chart: check direction, and expect it on the western miles and the Michigan Avenue stretch.
Two waves out of Grant Park from 7:30, corrals seeded tightly by qualifying time — be inside the park by 6:30, corrals close 10 minutes before the gun. The bottleneck at the line clears fast; you'll be at race pace within a few hundred metres, so resist making up the 'lost' first minute.
A painted blue line marks the measured tangent for all 26.2 miles — Chicago's corners make it genuinely worth following. Pre-set your watch to manual laps and hit the button at the mile markers: it's the only accurate splits you'll get downtown.
Free pace teams run even splits for every goal from 3:00 to 5:45 — sign up at the expo. On a course this flat, an even-split pacer is close to optimal strategy; starting just behind your group and joining it by mile 3 beats weaving to find it in the Loop.
Now make it concrete
Your exact splits.
The walkthrough above works at any speed. Pick your goal time for the kilometre and mile splits to anchor it to.
Bank of America Chicago Marathon — FAQ
Is the Chicago Marathon flat?
Yes — Chicago gains only about 74 m (243 ft) over 26.2 miles, and no single climb exceeds roughly 10 m. It's the flattest of the World Marathon Majors alongside Berlin, which is why it has produced multiple world records. The only hill runners remember is the Roosevelt Road overpass 800 m from the finish.
Is there a hill at the end of the Chicago Marathon?
One: the Roosevelt Road overpass at mile 25.8, nicknamed 'Mount Roosevelt.' It's only about 10 m of climbing, but it arrives on 26-mile legs. Shorten your stride, crest it, then it's one left turn and a 200 m flat straight to the finish.
Why is GPS inaccurate at the Chicago Marathon?
The downtown skyscrapers in miles 1–3 (and again near 24–26) block and reflect satellite signals, so GPS pace can read 20–30 seconds per mile fast or slow. Run the opening miles by feel, use the mile-marker clocks, and set your watch to manual laps if you want accurate splits.
How hot does the Chicago Marathon get?
Usually it doesn't — typical race mornings are 7–16 °C (45–60 °F). But October in Chicago has a long tail: 2007 reached 31 °C (88 °F) and the race was halted, and 2008, 2010 and 2011 all ran hot. Check the forecast in race week and adjust your goal time before you adjust anything else.
Is Chicago a good marathon for a first-timer or a PR?
It's excellent for both: flat, fast, superbly organized, with wall-to-wall crowd support and even-split pace teams from 3:00 to 5:45. The main risks are weather variance and flat-course overconfidence — pace the first half honestly and Chicago will give you everything back on Michigan Avenue.