Tecumseh, MI: frost dates by year

Last spring and first fall frost at NOAA station USC00208080, 2002 to 2023, measured from daily minimum temperatures.

Elevation 780 ft, 42.003, -83.934. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 1	Oct 16
Earliest	Apr 15 (2016)	Sep 30 (2009)
Latest	May 28 (2008)	Oct 27 (2007)
Trend	2.4 days earlier per decade	5.6 days later per decade
Years with data	15	17

At 28°F (hard freeze) the median last spring date is Apr 23 and the median first fall date is Oct 30.

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
2023	Apr 27	Oct 23	Apr 3	Oct 31
2021	May 2	no data	May 2	no data
2020	May 14	no data	May 13	no data
2019	Apr 16	Oct 13	Apr 12	Nov 3
2018	May 1	Oct 16	Apr 23	Oct 17
2017	May 9	Oct 26	Apr 8	Oct 26
2016	Apr 15	Oct 15	Apr 11	Nov 12
2015	Apr 29	no data	Apr 25	no data
2014	no data	Oct 11	no data	Nov 2
2013	no data	Oct 22	no data	Oct 24
2011	Apr 22	Oct 21	Apr 21	Oct 29
2010	May 9	Oct 16	Apr 27	Oct 30
2009	Apr 23	Sep 30	Apr 12	Oct 11
2008	May 28	Oct 18	Apr 30	Oct 21
2007	Apr 16	Oct 27	Apr 16	Nov 2
2006	no data	Oct 11	no data	Oct 14
2005	May 5	Oct 17	May 4	Oct 28
2004	May 4	Oct 2	May 3	Nov 7
2003	no data	Oct 2	no data	Nov 6
2002	no data	Oct 13	no data	Oct 30

"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.