![Map showing Last killing frost dates for the US, temperature ranges and temperature conversion guide - Garden Helper, Gardening Questions and Answers Map showing Last killing frost dates for the US, temperature ranges and temperature conversion guide - Garden Helper, Gardening Questions and Answers](https://www.thegardenhelper.com/map/graphics/frostkey.jpg)
Map showing Last killing frost dates for the US, temperature ranges and temperature conversion guide - Garden Helper, Gardening Questions and Answers
![Illinois Frost Dates and Growing Season, Illinois State Climatologist Office, Illinois State Water Survey, U of I Illinois Frost Dates and Growing Season, Illinois State Climatologist Office, Illinois State Water Survey, U of I](https://www.isws.illinois.edu/statecli/frost/spring-freeze-32-latest.png)
Illinois Frost Dates and Growing Season, Illinois State Climatologist Office, Illinois State Water Survey, U of I
![Map showing Last killing frost dates for the US, temperature ranges and temperature conversion guide - Garden Helper, Gardening Questions and Answers Map showing Last killing frost dates for the US, temperature ranges and temperature conversion guide - Garden Helper, Gardening Questions and Answers](https://www.thegardenhelper.com/map/graphics/frostdate.jpg)