National Weather Service United States Department of Commerce
The map below shows the average dates when various areas of the state see the last freeze of Spring. This is determined "climatologically", or by looking back through history.
Latest Spring Freezes on Record
Atlanta : April 25 (1910)
Athens : April 21 (1953)
Columbus : April 21 (1953)
Macon : April 20 (1983)
Another way to look at the map: your chance of experiencing the last freeze of the season is less than 50 percent after the dates shown for your location.

Also provided below are the dates on which last Spring freezes actually occurred over recent years for several locations. (Incidentally, dates for the first freeze of Autumn are included in the tables, too.)

"Actual" Last (and first) Freeze Dates
"Average" Dates for Last Spring Freeze

average dates of last Spring freeze in Georgia