In the Tennessee Valley, the average first fall freeze tends to occur within the last few days of October to early November. Per the National Weather Service in Huntsville, a hard freeze is locally defined as temperatures that fall below 29 degrees.
This year, temperatures have been slow to cool — as a result, the first frost for many in northern Alabama has not happened yet.
But there are spots that have already experienced their first hard freeze of the season. In fact, the National Weather Service in Huntsville has suspended their frost/freeze advisories for Moore and Franklin counties in Tennessee, as well as Jackson and DeKalb counties in Alabama.
According to Dan Dixon of the National Weather Service in Huntsville, “We have sufficient evidence to suggest that the 28 degree threshold required to terminate the growing season has been achieved across the majority of the area in these counties. Thus, no further frost advisories or freeze warnings will be issued for these four counties until next spring.”
“Although several locations across the remainder of the counties in our forecast area reached 30-32 degrees on the morning of Friday, Nov. 11 and once again earlier [Monday] morning, the 28 degree threshold has not been met for the majority of the area in these counties. Therefore, the autumn frost/freeze program will continue until further notice,” Dixon continued.
For the rest of the Tennessee Valley, a hard freeze is possible as soon as this Sunday morning, when temperatures are expected to plummet into the 20s for much of the region.
The following information from the National Weather Service in Huntsville outlines the average dates as well as the latest dates on record for a hard freeze in the Tennessee Valley.