This tool is an interactive map that provides county-level estimates of projected future (2011–2040, 2041–2070, 2071–2099) annual dates of last frost, as well as dates of first 70°F and first 80°F maximum temperatures.
Historical Change in Date of Last Freeze and Date of First Warm Day
This tool is excerpted from Chesapeake Bay Watershed Climate Impacts Summary and Outlook for Spring 2020.
- In general, the southern portion of the Mid-Atlantic experiences the date of last freeze earlier than the northern half of the region.
- From 2000–2019, the region has seen an increase in the number of counties with dates of last freeze in February and a decrease in the number of counties with dates of last freeze in the spring months.
- The northern half of the region tends to see warmer temperatures later in the spring, with northern Pennsylvania and southern New York typically seeing their first warm day in March or April.
- Between 2011–2019, nearly the entire region experienced the first warm day in February or March.