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When is the date of the last frost in Knoxville, TN?

Submitted by on January 19, 2012 – 4:33 pm | 6,979 views

We often get asked when is it safe to plant our annuals?  When is it safe to do my spring planting? When is the date of the last frost in Knoxville, Maryville, Powell, Oak Ridge, Lenior City, Farragut or Karns, Tennessee?

These charts from the National Climatic Data Center do a great job of letting us know!

 Results for Knoxville, TN  
Each winter, on average, your risk of frost is from October 23 through April 13.Almost certainly, however, you will receive frost from November 5 through March 29.You are almost guaranteed that you will not get frost from April 28 through October 8.Your frost-free growing season is around 193 days.

Detailed station data* follows:

Oak Ridge Atdl, TN (Anderson county):

Temperature 10% 20% 30% 40% 50% 60% 70% 80% 90%
Spring 32° Apr 28 Apr 23 Apr 19 Apr 16 Apr 13 Apr 10 Apr 7 Apr 3 Mar 29
Spring 28° Apr 16 Apr 10 Apr 6 Apr 2 Mar 30 Mar 26 Mar 23 Mar 18 Mar 12
Spring 24° Apr 5 Mar 29 Mar 24 Mar 19 Mar 15 Mar 11 Mar 6 Mar 1 Feb 22
Fall 32° Oct 8 Oct 13 Oct 17 Oct 20 Oct 23 Oct 26 Oct 29 Oct 31 Nov 5
Fall 28° Oct 23 Oct 28 Oct 31 Nov 2 Nov 4 Nov 7 Nov 10 Nov 13 Nov 18
Fall 24° Nov 4 Nov 9 Nov 13 Nov 16 Nov 20 Nov 23 Nov 26 Dec 1 Dec 6

Norris Evap Stn, TN (Anderson county):

Temperature 10% 20% 30% 40% 50% 60% 70% 80% 90%
Spring 32° May 9 May 3 Apr 29 Apr 25 Apr 21 Apr 18 Apr 14 Apr 10 Apr 4
Spring 28° Apr 21 Apr 16 Apr 12 Apr 9 Apr 5 Apr 2 Mar 30 Mar 26 Mar 21
Spring 24° Apr 11 Apr 5 Apr 1 Mar 28 Mar 25 Mar 22 Mar 18 Mar 14 Mar 8
Fall 32° Oct 8 Oct 13 Oct 16 Oct 19 Oct 22 Oct 25 Oct 28 Oct 31 Nov 3
Fall 28° Oct 15 Oct 21 Oct 26 Oct 30 Nov 2 Nov 5 Nov 9 Nov 14 Nov 20
Fall 24° Nov 3 Nov 8 Nov 12 Nov 15 Nov 19 Nov 22 Nov 25 Nov 29 Dec 5

Lenoir City, TN (Loudon county):

Temperature 10% 20% 30% 40% 50% 60% 70% 80% 90%
Spring 32° Apr 25 Apr 19 Apr 16 Apr 12 Apr 10 Apr 7 Apr 3 Mar 31 Mar 25
Spring 28° Apr 10 Apr 4 Mar 31 Mar 27 Mar 24 Mar 21 Mar 17 Mar 13 Mar 7
Spring 24° Mar 29 Mar 22 Mar 16 Mar 12 Mar 8 Mar 3 Feb 27 Feb 21 Feb 14
Fall 32° Oct 12 Oct 17 Oct 21 Oct 24 Oct 27 Oct 30 Nov 2 Nov 5 Nov 11
Fall 28° Oct 30 Nov 3 Nov 6 Nov 9 Nov 12 Nov 14 Nov 17 Nov 21 Nov 26
Fall 24° Nov 7 Nov 13 Nov 18 Nov 22 Nov 25 Nov 29 Dec 4 Dec 8 Dec 15

* This station data is available courtesy the National Climatic Data Center.

For each station, you will see a temperature along with a pile of percentage columns. Here’s how it works: The percent column tells you the probability that you will experience that row’s temperature on or before that date.

So, for example, in the Spring 32° row, if you have “Apr 15″ under the 50% column, that means that you have a 50% chance of seeing frost on or before April 15th.

Another example. Say in the Fall 24° row, under 90%, you have Dec 1, then that means that you have a 90% chance of seeing 24 degrees on or before December 1st.

Empty cells indicate you have a less than 10% chance of ever seeing that temperature.