Last Frost Date Zone 6 2024. A plant’s cold hardiness zone indicates where a plant is likely to survive the winter. The last frost date for your location is a good indicator of when it is safe to start planting seeds or seedlings outdoors.
These aren’t set in stone but serve as a guide for when it’s safe to plant frost. A frost date is the average date of the last light freeze in spring or the first light freeze in fall.