Illinois frost dates: Y
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Yale | Apr 14 | Oct 20 | 189 d | 6b |
| Yates City | Apr 21 | Oct 20 | 182 d | 5b |
| Yorkville | Apr 28 | Oct 13 | 168 d | 5b |
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Yale | Apr 14 | Oct 20 | 189 d | 6b |
| Yates City | Apr 21 | Oct 20 | 182 d | 5b |
| Yorkville | Apr 28 | Oct 13 | 168 d | 5b |