The National Weather Service (NWS) issues Frost Advisories and Freeze Warnings during the growing season to alert those with agricultural interests that cold temperatures may impact sensitive vegetation, such as fruits, vegetables, and flowers.
Most springs, the growing season doesn’t begin in northeast and north-central Wisconsin until late April or early May. This is normally when the NWS frost and freeze program begins. However, the recent stretch of record setting summer-like warmth has caused the growing season to begin four to six weeks earlier than normal. As a result, the NWS Green Bay office will begin issuing advisories for sub-freezing temperatures so those with sensitive vegetation can mitigate the impact of the cold during this early spring.
Freeze Warnings will be issued for northeast and north-central Wisconsin when temperatures of 28 F or lower are anticipated. Frost will be forecast when temperatures of around 32 F or lower are expected with the formation of frost, but Frost Advisories will not yet be issued due to the more limited impact these temperatures have on existing agriculture. As the spring progresses, normal advisories for frost and freeze conditions will resume.