The Frost and Freeze map shows where frost cant be expected and where temperature are forecast to fall below 32 degrees F. Frost is a solid deposition of water vapor from saturated air.

Additionally, many seed packets will give gardeners instructions on timing of when to start their seeds either indoors or outdoors based on their local average last frost dates. Many seeds recommend ...

"A frost date is the average date of the last light freeze in spring or the first light freeze in fall ... go to the climate.gov average last freeze map. The date is an average, so frosts ...