First Day Of Frost 2024 Washington State. Climate averages, frost dates, hardiness zones and drought conditions for seattle washington The probability of a frost occurring after the spring frost date or before the fall frost date is 30%, which means there is still a chance of frost occurring before or after the given.

Use this mapping tool to find the average of first and last frost date in your city or state by zip code to make sure you start your garden at the right time, not too early, not too late. A frost date is the average date of the last light freeze in spring or the first light freeze in fall.