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The dates will depend on whatThe dates will depend on what temperature data you are using (32 degrees, 36 degrees), and what percentile of occurrences (10, 50, 90 percent, etc.). We use 32 degrees and 50 percent. In this case, according to NOAA, the first expected frost date in Wilmington, North Carolina, would be about November 14 to 16.   You might be interested in the following Web pages: http://www.erh.noaa.gov/ilm/climate/freeze/Wilmington.html#fall http://www.erh.noaa.gov/ilm/climate/freeze/ http://www.ces.ncsu.edu/hil/hil-708.html