Corrals are one of those things every Chicago Marathon participant eventually cares about, but the process for getting properly assigned is not particularly clear from the registration confirmation emails. Here is a straightforward breakdown of how it works, what times map to which corrals, and what you can actually do if your assignment comes back wrong.
2026 Timeline
Preliminary corral assignments will be available in July 2026. If you have a qualifying time, log into your Participant Account and submit it now. Runners who do not submit a time will receive a corral assignment at the event's discretion.
How Corral Assignments Work
Chicago Marathon corral assignments are based on three inputs: the qualifying standards chart, the information you submitted during registration (both your estimated finish time and any qualifying result you provided), and your previous Chicago Marathon finishing times if you have run it before.
When you registered, you were asked for an expected finish time and given the option to submit a qualifying race result. That qualifying result, a recent half marathon or full marathon from a certified course, is the strongest signal for placement in Wave 1 or Wave 2 corrals. Without a qualifying time on file, you will be assigned based on your estimated finish time alone, and that process is less predictable.
From my experience
When I registered for 2026, I put my expected finish time and submitted my 2024 BOA Chicago 13.1 result as a qualifier, with a link to the race tracking page as proof. In 2025, the same qualifying time landed me in Corral G, which corresponds to the 3:40 to 3:50 wave. I expect a similar placement this year.
One important nuance: corrals are physically fixed in size. Even if your time qualifies you for a particular corral, you may be placed in a different one simply because that corral is already full at the time of assignment. The preliminary assignments are not final, and there is a window to request changes.
The weighting between these inputs is not publicly documented, and the results are genuinely inconsistent. Community reports from 2025 show runners with identical qualifying times landing in different corrals, runners placed faster than their times would suggest, and runners placed several corrals slower with no clear explanation. Chicago appears to run some kind of blended algorithm across qualifying time, estimated finish time, and prior Chicago results, but the output does not always follow the chart cleanly. If your assignment looks wrong, you are not imagining it. This thread on r/ChicagoMarathon has a detailed discussion of how widespread the issue was in 2025.
How to find your assigned corral
Log into your Participant Account at chicagomarathon.com, then go to Your Events. Your name, wave, and corral will be listed there once preliminary assignments are published in July.
How to Submit a Qualifying Time
If you have not already submitted a qualifying race result, log into your Participant Account on the Chicago Marathon website and navigate to your registration information. You will see a section asking whether you want to submit a qualifying time for corral placement.
To qualify, the race must have taken place on or after January 1, 2024 and must be on a certified course. You will need to provide:
- 1The name of the qualifying race
- 2The year and distance (half marathon or full marathon)
- 3Your official finish time
- 4A link to proof of your result (race tracking page, official results site, or equivalent)
The estimated finish time field in your Participant Account can also be edited after registration. Updating it to reflect your current goal pace is worth doing even if your corral placement is based on a qualifying time, since Chicago uses all available data when making assignments.
What counts as proof
A link to an official results page is the cleanest option. Race tracking links (rtrt.me, FinisherPix results, RunSignup) are generally accepted. Have the URL ready. According to r/ChicagoMarathon discussions, the Solutions Desk at the expo will also accept recent Strava activity links for half-marathon distance or longer, though official results are more reliable.
2025 Start Corral Qualifying Standards
The 2026 qualifying standards have not yet been published. The table below reflects the 2025 standards. These are provided as a reference and are likely to be similar for 2026, but check the official 2025 qualifying standards PDF and the Chicago Marathon website for the confirmed 2026 version when it publishes.
Wave Start Times
Wave 1: 7:30 AM · Wave 2: 8:00 AM · Wave 3: 8:30 AM. The Chicago Marathon has 13 corrals total: A, B, C, D, E, F, G, H, J, K, L, M, and N. There is no Corral I.
| Corral | Marathon (h:mm:ss) | Half Marathon (h:mm:ss) |
|---|---|---|
| Wave 1 — Start time: 7:30 AM | ||
| A | < 2:45:01 | < 1:18:01 |
| B | 2:45:01 – 2:53:00 | 1:18:01 – 1:23:00 |
| C | 2:53:01 – 3:08:00 | 1:23:01 – 1:30:00 |
| D | 3:08:01 – 3:20:00 | 1:30:01 – 1:35:00 |
| E | 3:20:01 – 3:25:00 | 1:35:01 – 1:38:00 |
| Wave 2 — Start time: 8:00 AM | ||
| F | 3:25:01 – 3:40:00 | 1:38:01 – 1:45:00 |
| G | 3:40:01 – 3:50:00 | 1:45:01 – 1:50:00 |
| H | 3:50:01 – 4:00:00 | 1:50:01 – 1:55:00 |
| J | 4:00:01 – 4:10:00 | 1:55:01 – 2:00:00 |
| Wave 3 — Start time: 8:30 AM (Estimated pace, no qualifier required) | ||
| K | 4:10:01 – 4:35:00 | 9:33 – 10:30 /mi |
| L | 4:35:01 – 4:50:00 | 10:30 – 11:04 /mi |
| M | 4:50:01 – 5:10:00 | 11:04 – 11:50 /mi |
| N | 5:10:01 – 6:30:00 | 11:50 – 14:53 /mi |
Source: 2025 Bank of America Chicago Marathon qualifying standards. 2026 standards will be published by Chicago Marathon.
What Happens After July
When preliminary assignments drop, you will receive an email notification. Log into your Participant Account to check your assigned corral and wave.
If your placement does not match your qualifying time, you have until approximately August 12 to submit a change request through your Participant Account. This deadline has been consistent in recent years but confirm the exact date on the Chicago Marathon site once assignments are live. Submitting proof of your qualifying time at this stage can get you moved, though reassignment is subject to availability in your target corral.
From my experience
Corral assignment inconsistency is widespread enough that it generates multiple threads every year on r/ChicagoMarathon when preliminary assignments drop. In 2025, runners reported placements anywhere from one to several corrals off from what their submitted times should have produced, in both directions. Submitting a change request with proof is the right move if anything looks off. Chicago's process for handling corrections is better than most other majors.
The Expo Solutions Desk
If you miss the August deadline or your change request is denied, there is still an option at the expo. Look for the "Solutions" booth in the expo hall. Bring proof of your qualifying time on your phone, official results are better than training runs, though the desk has accepted recent Strava activities for half-marathon distance or longer in past years.
A few things worth knowing about the Solutions Desk, sourced from community experience on r/ChicagoMarathon:
- Corrals have a fixed number of available bibs. Once a corral fills, there is nothing Solutions can do regardless of your time.
- Go early on the first day of the expo. Saturday afternoon is the worst time to show up if you need a specific corral.
- Moving one or two corrals back (to a slower group) is generally easier than moving forward.
- Moving as a group of more than two people is unlikely to work. Individual requests fare much better.
- Wave 1 corrals (A through E) require official proof. Later corrals have more flexibility.
Moving to a slower corral
If you think you overestimated your finishing time, you do not need to contact anyone before race day. You can simply show up at a later corral's entrance on the morning of the race and no one will stop you. Moving forward without an updated bib is not allowed. The advice from the community: do not rush to move back before race day, because your training may improve and you will regret it.
Common Questions
How many corrals does the Chicago Marathon have?
There are 13 corrals: A, B, C, D, E, F, G, H, J, K, L, M, and N. There is no Corral I. Corrals A through E make up Wave 1 (7:30 AM start), F through J are Wave 2 (8:00 AM), and K through N are Wave 3 (8:30 AM).
What time does each wave start at the Chicago Marathon?
Wave 1 starts at 7:30 AM, Wave 2 at 8:00 AM, and Wave 3 at 8:30 AM. Your wave is determined by your corral assignment. Corrals A through E are Wave 1, F through J are Wave 2, and K through N are Wave 3.
I submitted a qualifying time but my corral seems significantly off. What happened?
You are not imagining it. Corral assignment inconsistency is well-documented in the Chicago Marathon community. The placement algorithm appears to blend qualifying time, estimated finish time, and prior Chicago results, and the output does not always follow the chart. Runners in 2025 reported placements several corrals off in both directions from what their times should have produced. Submit a change request before the August deadline with your proof attached. The marathon office is generally responsive. If that window closes, the expo Solutions Desk is your next option.
I think I overestimated my time and should be in a slower corral. What do I do?
Nothing before race day. You can self-select into a slower corral by simply walking to that corral's entrance on the morning of the race. No one will stop you from moving back. Moving forward to a faster corral without an updated bib assignment is not allowed. The advice from runners who have done this: do not make any formal requests to move back before race day, because your training may come together and you will regret giving up the earlier position.
Does my 2024 Chicago Marathon finish time factor into my corral?
Yes. Chicago Marathon uses previous Chicago Marathon results as part of the placement algorithm, along with your submitted qualifier and estimated finish time. If you ran Chicago in 2024, that time is in their system.
I only have a 5K or 10K result. Can I submit that?
No. Only half marathon and full marathon results on certified courses are accepted as qualifying times. For Wave 3 corrals (K through N), you do not need to submit a qualifying time at all. Your estimated finish time is used for placement.
What is the cutoff for qualifying race results?
Based on the 2025 standards, results must be from a certified course completed on or after January 1, 2024. That requirement has been consistent in recent years and is expected to carry forward for 2026, though confirm on the Chicago Marathon website once 2026 details are published.
Can I run with a friend who is in a different corral?
If your friend is in a slower corral, either of you can move back on race morning by walking to that corral entrance. No formal process needed. If your friend is in a faster corral and you want to join them, that requires a legitimate bib reassignment through the change request process or the expo Solutions Desk. Showing up at a faster corral without the right bib is not allowed.
When will 2026 corral assignments be available?
The 2026 preliminary assignments are expected in July. Check your email and log into your Participant Account at chicagomarathon.com. The change request window typically closes in mid-August.