| Lane | Team | Squad | Seed | Note |
|---|---|---|---|---|
| 3 | Latin School of Chicago | A | 1:10.00 | |
| 4 | Antioch Upper | A | 1:01.40 | |
| 5 | Francis W. Parker | A | 1:05.00 | |
| 6 | Percy Julian | A | DNS |
| Lane | Team | Squad | Seed | Note |
|---|---|---|---|---|
| 1 | Lake Zurich North | A | 56.10 | |
| 2 | Hawthorn North | A | 54.03 | |
| 3 | Grayslake | A | 51.64 | |
| 4 | Hawthorn South | A | 49.99 | |
| 5 | Big Hollow | A | 50.18 | |
| 6 | Park | A | 52.30 | |
| 7 | Lake Zurich South | A | 54.20 | |
| 8 | Barrington-Prairie Campus | A | 58.64 |