National Weather Service United States Department of Commerce

 

Southport, North Carolina Spring and Fall Freeze Statistics

 

Southport's average date for the last spring freeze is  March 23

 

Spring freeze statistics sorted by probability

Probability Date
1% Feb 21
5% Mar 2
10% Mar 7
25% Mar 15
50% Mar 23
75% Apr 1
90% Apr 9
95% Apr 14
99% Apr 22

 

 

 

 

Earliest last spring freeze: Feb 2, 1945

Latest last spring freeze: April 20, 1926

 

 

 

Spring freeze statistics sorted by date

Date Probability
Jan 25 0.0%
Feb 1 0.0%
Feb 5 0.0%
Feb 10 0.1%
Feb 15 0.2%
Feb 20 0.7%
Feb 25 1.9%
Mar 1 3.9%
Mar 5 7.3%
Mar 10 14.3%
Mar 15 24.8%
Mar 20 38.4%
Mar 25 53.6%
Mar 30 68.4%
Apr 5 82.7%
Apr 10 90.8%
Apr 15 95.7%
Apr 20 98.2%
Apr 25 99.4%
Apr 30 99.8%
May 5 99.9%
May 10 100.0%

 

 

 

 

 

Spring Freeze probabilities for Southport, NC

Observed spring freeze dates 1950-2020 in Southport, NC

Since 1955, the date of  Southport's last spring freeze has shifted 1.0 days earlier per decade.  

 

 

 

Southport's average date for the first fall freeze is  November 12

 

Fall freeze statistics sorted by probability

Probability Date
1% Oct 7
5% Oct 18
10% Oct 23
25% Nov 1
50% Nov 12
75% Nov 22
90% Dec 1
95% Dec 6
99% Dec 17

 

 

 

 

Earliest first fall freeze: October 10, 2000

Latest first fall freeze: January 10, 1946

 

 

 

Fall freeze statistics sorted by date

Date Probability
Oct 1 0.3%
Oct 5 0.6%
Oct 10 1.5%
Oct 15 3.2%
Oct 20 6.4%
Oct 25 11.7%
Nov 1 23.3%
Nov 5 32.1%
Nov 10 44.7%
Nov 15 57.8%
Nov 20 70.1%
Nov 25 80.4%
Nov 30 88.2%
Dec 5 93.5%
Dec 10 96.8%
Dec 15 98.5%
Dec 20 99.4%
Dec 25 99.8%
Dec 30 100.0%

 

 

 

 

 

Fall Freeze probabilities for Southport, NC

Observed fall freeze dates 1950-2020 in Southport, NC

Since 1955, the date of Southport's first fall freeze has shifted 0.9 days later per decade.

 

 

 

Southport's average growing season length is 232 days

 

Growing season statistics sorted by probability

Probability Days
1% 278
5% 264
10% 257
25% 245
50% 232
75% 219
90% 207
95% 200
99% 187

 

 

 

 

Shortest growing season: 190 days in 1962

Longest growing season: 327 days in 1945-1946

 

 

 

Growing season statistics sorted by days

Days Probability
160 100.0%
170 99.9%
180 99.6%
190 98.5%
200 95.1%
210 87.4%
220 73.6%
225 64.6%
230 54.7%
235 44.5%
240 34.7%
245 25.8%
250 18.2%
255 12.2%
260 7.8%
270 2.7%
280 0.7%
290 0.2%
300 0.0%

 

 

 

 

 

Growing season length probabilities for Southport, NC

Observed growing season lengths from 1950-2020 in Southport, NC

Since 1955, the length of Southport's growing season has increased 1.8 days per decade.

 

 

 

Research and Page Author: Tim Armstrong and Vicky Oliva
Last Updated: September 13, 2026