| Lane | Athlete | Team | Seed | Note | 
|---|---|---|---|---|
| 4 | FOGEL, Sam | Lake Zurich South | 1:30.00 | |
| 5 | LEDINSKY, Kasey | Lake Zurich South | NT | 
| Lane | Athlete | Team | Seed | Note | 
|---|---|---|---|---|
| 1 | HOMMER, Abby | Hawthorn South | 1:18.50 | |
| 2 | GROTH, Jordan | Grayslake | 1:12.60 | |
| 3 | WISNIEWSKI, Rosalie | Wauconda | 1:11.20 | |
| 4 | HUSBY, Brooke | Barrington-Prairie Campus | 1:10.00 | |
| 5 | CASTAGNA, Ashlyn | Grayslake | 1:10.80 | |
| 6 | BORZECKI, Zuzanna | Matthews | 1:11.90 | |
| 7 | MAGRO, Morgan | Barrington-Station Campus | 1:14.00 | |
| 8 | LYLE, Zoe | Hawthorn North | NT | 
| Lane | Athlete | Team | Seed | Note | 
|---|---|---|---|---|
| 1 | POKORNY, Reagan | Barrington-Prairie Campus | 1:09.00 | |
| 2 | BENITO, Katie | Hawthorn North | 1:08.00 | |
| 3 | SHEIN, Katherine | Barrington-Station Campus | 1:07.00 | |
| 4 | PROFT, Taylor | Hawthorn South | 1:04.30 | |
| 5 | DAVIS, Morgan | Lake Zurich North | 1:05.00 | |
| 6 | BURK, Hayley | Lake Zurich North | 1:07.90 | |
| 7 | TRELA, Emily | Matthews | 1:08.10 | |
| 8 | TERNES, Ellie | Wauconda | 1:10.00 |