Frost/Freeze Information for Louisville, Kentucky

Records:
Latest spring frost (36°):  May 27, 1961
Latest spring freeze (32°):  May 10, 1966
Latest spring hard freeze (28°):  April 23, 1986
Earliest final spring frost (36°):  March 15, 1884
Earliest final spring freeze (32°):  March 5, 1927
Earliest final spring hard freeze (28°):  February 19, 1905
Earliest fall frost (36°):  September 25, 1950
Earliest fall freeze (32°):  October 3, 1974
Earliest fall hard freeze (28°):  October 10, 1964
Latest first fall frost (36°):  November 23, 1902
Latest first fall freeze (32°):  November 28, 1899 and November 28, 2009
Latest first fall hard freeze (28°):  December 13, 1939
Longest growing season:  257 days in 1884
Shortest growing season:  166 days in 1976

Averages:
Average last spring frost (36°):  April 19
Average last spring freeze (32°):  April 6
Average last spring hard freeze (28°):  March 25
Average first fall frost (36°):  October 20
Average first fall freeze (32°):  November 1
Average first fall hard freeze (28°):  November 12

Two tables of graphs follow.  The first shows average dates of last spring freeze/hard freeze and first fall freeze/hard freeze.  The y-axis shows how many times that event has occurred during each week given on the x-axis.  For example, the last spring freeze in Louisville has occurred during the week of April 9-15 34 times (since records began in 1871).

The second table shows how these average dates have changed over time.  We broke the historical record down into decades, and found the average date for each decade.  The average for the entire period of record is shown with a red line, for comparison.

After the tables are contoured maps showing the median first freeze/hard freeze dates across the region.

Last spring freeze in Louisville Last spring 28 degree temperature in Louisville
First fall freez in Louisville Average date of first 28 degree temperature in Louisville

Average date of last spring freeze in Louisville, decadal Average date of last 28 degree temperature in Louisville, decadal
Average date of first fall freeze in Louisville, decadal Average date of first fall hard freeze in Louisville, decadal

 Median date for first fall freeze

Median date for first fall 28 degree reading

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