Houston vs Chicago Marathon — How Do They Compare?

Compare Houston and Chicago Marathons — two of America's flattest, fastest courses. January vs October timing, open entry vs lottery, and which is better for your PR.

Quick Comparison

Feature 2027 Houston Marathon - Jan 17 2026 Chicago Marathon - Oct 11
Country/RegionUSAUSA
MonthJanuaryOctober
Avg Temperature6-14°C8-16°C
Course TypeFlatFlat
Elevation~15m~20m
Field Size26,00045,000
EntryOpen EntryLottery + Time
World MajorNoYes
BQ CourseYesYes
Crowd SupportGoodExcellent

Detailed Comparison

The Houston Marathon and the Chicago Marathon are two of the flattest, fastest marathon courses in the United States, making them natural rivals for runners chasing personal bests or Boston qualifying times. Houston's ~15m elevation and Chicago's ~20m elevation are both negligible — the difference in course difficulty is minimal.

The key differentiators are timing and access. Houston runs in January (6-14°C) with open entry — anyone can register, guaranteed. Chicago runs in October (8-16°C) and requires a lottery or qualifying time for entry, with no guarantee of getting in. For runners who need a guaranteed fast course without the stress of a lottery, Houston is the pragmatic choice.

Chicago brings World Marathon Major prestige, 1.7 million spectators across 29 neighborhoods, and a massive 45,000-runner field with elite pacing groups. Houston is smaller (26,000) but still well-organized with a strong local running community. Both produce excellent BQ rates. If you value guaranteed entry and a January race to kick off your year, choose Houston. If you want the Major experience and don't mind the lottery, Chicago is worth the attempt.

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Frequently Asked Questions

Which is faster, Houston or Chicago Marathon?

Both are among America's fastest courses. Houston (~15m elevation) is slightly flatter than Chicago (~20m), but the difference is negligible. Chicago's larger field offers more pacing groups. In practice, your finish time should be very similar on either course. Use our Pace Calculator for target splits.

Which is easier to enter?

Houston is much easier — it uses open registration with no lottery. Anyone can sign up and get a guaranteed spot. Chicago requires a lottery or qualifying time, with no certainty of entry. If you need a guaranteed race, Houston is the answer.

Which is better for a Boston qualifier?

Both are excellent BQ courses. Houston's flat January course in cool weather is a top BQ choice. Chicago's flat October course with massive pacing groups is equally effective. The main advantage of Houston is guaranteed entry — you can plan your BQ attempt without lottery uncertainty. Check your target with our Boston Qualifying Calculator.

How does the weather compare?

Houston in January averages 6-14°C, which is ideal but can have variable humidity. Chicago in October averages 8-16°C with drier conditions but occasional wind off Lake Michigan. Both offer good racing weather. Use our Weather Race Score tool to compare.

Can I run both in the same year?

Yes, and it is a smart strategy. Houston in January and Chicago in October gives you 9 months between races — plenty of time for recovery, a training cycle, and a second peak. Use Houston as your BQ attempt and Chicago for the World Major experience, or vice versa.

Prepare for Your Marathon

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