| Q | IHSA Boys 2A Qualifying | 43.39 | 2A Qualifying | 
| Lane | Team | Squad | Seed | Note | 
|---|---|---|---|---|
| 2 | Woodstock (Marian) | A | 48.15 | |
| 3 | Belvidere (H.S.) | A | 46.94 | |
| 4 | Woodstock (H.S.) | A | 46.17 | |
| 5 | Marengo | A | 46.79 | |
| 6 | Mundelein (Carmel) | A | 47.44 | |
| 7 | Poplar Grove (North Boone | A | 48.23 | 
| Lane | Team | Squad | Seed | Note | 
|---|---|---|---|---|
| 1 | Johnsburg | A | 45.91 | |
| 2 | Arlington Heights (St. Vi | A | 45.56 | |
| 3 | Vernon Hills | A | 44.90 | |
| 4 | North Chicago | A | 44.15 | |
| 5 | Woodstock (North) | A | 44.73 | |
| 6 | Rockford (Boylan Catholic | A | 45.27 | |
| 7 | Harvard | A | 45.84 | |
| 8 | Richmond (R.-Burton) | A | 46.06 |