Frost history / Knoxville Exp Stn, TN
Knoxville Exp Stn, TN: frost dates by year
Last spring and first fall frost at NOAA station USC00404946, 1983 to 2025, measured from daily minimum temperatures.
Elevation 830 ft, 35.898, -83.957. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | Apr 12 | Oct 28 |
| Earliest | Mar 19 (2017) | Oct 7 (1991) |
| Latest | May 11 (2020) | Nov 21 (2016) |
| Trend | 1.4 days earlier per decade | 0.8 days later per decade |
| Years with data | 37 | 37 |
At 28°F (hard freeze) the median last spring date is Mar 23 and the median first fall date is Nov 7.
The trend is a straight-line fit through the years with a freeze. A positive spring trend means the last frost now comes later. Short or patchy records give noisy trends.
Chart
Last spring frost (32°F)
First fall frost (32°F)
Dots are single years. The gray line is the median, the green line the fitted trend.
Year by year
| Year | Last spring 32°F | First fall 32°F | Last spring 28°F | First fall 28°F |
|---|---|---|---|---|
| 2025 | Apr 14 | no data | Mar 8 | no data |
| 2024 | Apr 24 | Oct 17 | Mar 22 | Nov 30 |
| 2023 | Mar 23 | Nov 2 | Mar 23 | Nov 3 |
| 2022 | Apr 12 | Oct 19 | Mar 15 | Nov 15 |
| 2021 | Apr 22 | Nov 7 | Apr 3 | Nov 20 |
| 2020 | May 11 | Oct 18 | Mar 9 | Nov 3 |
| 2019 | Apr 3 | Nov 1 | Mar 6 | Nov 4 |
| 2018 | Apr 19 | Nov 11 | Mar 25 | Nov 12 |
| 2017 | Mar 19 | Oct 30 | Mar 18 | Oct 30 |
| 2016 | Apr 7 | Nov 21 | Mar 23 | Nov 21 |
| 2015 | Apr 6 | Oct 19 | Apr 6 | Nov 23 |
| 2014 | Apr 17 | Nov 2 | Apr 16 | Nov 2 |
| 2013 | Mar 29 | Oct 25 | Mar 29 | Oct 25 |
| 2012 | Apr 12 | Nov 1 | Mar 6 | Nov 14 |
| 2011 | no data | Oct 30 | no data | Nov 11 |
| 2010 | Mar 27 | Nov 7 | Mar 7 | Nov 7 |
| 2009 | Apr 8 | Oct 19 | Mar 21 | Nov 28 |
| 2008 | Apr 16 | Oct 29 | Mar 25 | Oct 29 |
| 2007 | Apr 13 | no data | Apr 9 | no data |
| 2006 | no data | Oct 13 | no data | Nov 3 |
| 2005 | Apr 4 | Oct 28 | Mar 20 | Oct 30 |
| 2004 | Apr 6 | no data | Mar 23 | no data |
| 2003 | Apr 1 | Nov 14 | Mar 31 | Nov 14 |
| 2002 | Apr 8 | Nov 2 | Mar 28 | Nov 18 |
| 2001 | Apr 20 | Oct 17 | Mar 28 | Oct 28 |
| 2000 | Apr 9 | Oct 8 | Mar 18 | Nov 15 |
| 1999 | Mar 29 | Oct 24 | Mar 28 | Nov 4 |
| 1998 | Apr 12 | Oct 23 | Mar 23 | Nov 6 |
| 1997 | Apr 15 | Oct 23 | Mar 17 | Oct 24 |
| 1996 | Apr 17 | Oct 20 | Apr 11 | Nov 3 |
| 1995 | Apr 4 | Nov 4 | Mar 12 | Nov 4 |
| 1994 | Apr 9 | Oct 28 | Mar 18 | Nov 23 |
| 1993 | Apr 23 | Oct 28 | Mar 19 | Nov 2 |
| 1992 | Apr 5 | Oct 19 | Apr 5 | Nov 9 |
| 1991 | Mar 31 | Oct 7 | Mar 31 | Nov 3 |
| 1990 | Apr 13 | Oct 26 | Apr 13 | Nov 18 |
| 1989 | May 8 | no data | Apr 12 | no data |
| 1988 | no data | Oct 13 | no data | Oct 14 |
| 1986 | Apr 24 | Nov 14 | Apr 23 | Nov 14 |
| 1984 | no data | Nov 7 | no data | Nov 8 |
| 1983 | Apr 24 | Nov 5 | Apr 20 | Nov 14 |
"none" means the station recorded no freeze at that threshold in that half of the year. "no data" means more than 10% of the season's daily readings were missing. Years with no usable data are left out. See the methodology for the rules, and the ZIP lookup for 1991 to 2020 frost probabilities.