Decatur 1 N, IN: frost dates by year

Last spring and first fall frost at NOAA station USC00122096, 2005 to 2025, measured from daily minimum temperatures.

Elevation 785 ft, 40.848, -84.930. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 28	Oct 22
Earliest	Apr 2 (2019)	Oct 8 (2012)
Latest	May 12 (2020)	Nov 10 (2016)
Trend	2.1 days later per decade	0.8 days later per decade
Years with data	20	21

At 28°F (hard freeze) the median last spring date is Apr 13 and the median first fall date is Nov 1.

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 18	Oct 25	Apr 13	Nov 2
2024	Apr 26	Oct 17	Mar 28	Nov 3
2023	Apr 29	Oct 22	Apr 27	Oct 31
2022	Apr 28	Oct 8	Apr 20	Nov 18
2021	May 10	Oct 27	May 10	Nov 4
2020	May 12	Oct 31	May 9	Nov 12
2019	Apr 2	Oct 18	Apr 2	Nov 1
2018	May 1	Oct 18	Apr 21	Oct 19
2017	May 8	Oct 26	Mar 24	Nov 9
2016	Apr 15	Nov 10	Apr 10	Nov 10
2015	Apr 29	Oct 18	Apr 24	Oct 18
2014	Apr 17	Oct 23	Apr 17	Nov 2
2013	Apr 27	Oct 23	Apr 21	Oct 28
2012	Apr 28	Oct 8	Apr 13	Nov 4
2011	Apr 14	Oct 22	Apr 3	Oct 30
2010	Apr 29	Oct 19	Mar 31	Nov 1
2009	Apr 24	Oct 17	Mar 21	Oct 18
2008	May 1	Oct 19	Apr 16	Oct 23
2007	Apr 16	Oct 28	Apr 11	Nov 2
2006	Apr 27	Oct 13	Apr 9	Oct 15
2005	no data	Oct 26	no data	Oct 29

"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.