Chalmers 5 W, IN: frost dates by year

Last spring and first fall frost at NOAA station USC00121417, 2008 to 2025, measured from daily minimum temperatures.

Elevation 720 ft, 40.665, -86.955. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 24	Oct 22
Earliest	Apr 8 (2017)	Oct 4 (2010)
Latest	May 10 (2020)	Nov 12 (2016)
Trend	1.1 days later per decade	4.2 days later per decade
Years with data	17	17

At 28°F (hard freeze) the median last spring date is Apr 9 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 13	Oct 24	Apr 9	Nov 2
2024	Apr 26	Oct 28	Mar 29	Nov 27
2023	Apr 25	Oct 18	Mar 31	Oct 31
2022	Apr 28	Oct 8	Mar 30	Oct 20
2021	Apr 23	Nov 2	Apr 21	Nov 3
2020	May 10	no data	May 10	no data
2019	Apr 15	Oct 12	Apr 3	Nov 1
2018	Apr 30	Oct 13	Apr 19	Oct 19
2017	Apr 8	Oct 26	Mar 24	Nov 9
2016	Apr 15	Nov 12	Apr 10	Nov 13
2015	Apr 29	Oct 17	Apr 25	Nov 14
2014	Apr 24	Oct 30	Apr 17	Nov 1
2013	Apr 22	Oct 22	Apr 5	Oct 22
2012	Apr 28	Oct 6	Apr 13	Oct 8
2011	Apr 22	Oct 25	Apr 2	Oct 28
2010	Apr 28	Oct 4	Mar 27	Nov 3
2009	Apr 13	Oct 11	Apr 13	Nov 1
2008	no data	Oct 22	no data	Oct 23

"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.