Vassar, MI: frost dates by year

Last spring and first fall frost at NOAA station USC00208443, 2007 to 2022, measured from daily minimum temperatures.

Elevation 630 ft, 43.366, -83.583. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 12	Oct 5
Earliest	Apr 20 (2011)	Sep 14 (2013)
Latest	May 31 (2021)	Oct 26 (2017)
Trend	0.8 days earlier per decade	9.8 days later per decade
Years with data	15	15

At 28°F (hard freeze) the median last spring date is Apr 28 and the median first fall date is Oct 19.

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
2022	May 8	no data	Apr 30	no data
2021	May 31	Oct 24	May 2	Nov 3
2020	no data	Sep 19	no data	Oct 16
2019	May 12	Oct 15	Apr 5	Oct 15
2018	May 7	Oct 16	Apr 30	Oct 18
2017	May 10	Oct 26	May 9	Oct 26
2016	May 18	Oct 9	Apr 28	Oct 26
2015	May 24	Oct 17	Apr 27	Oct 18
2014	May 6	Sep 20	Apr 28	Oct 11
2013	May 26	Sep 14	Apr 28	Oct 24
2012	Apr 30	Sep 24	Apr 30	Oct 8
2011	Apr 20	Sep 16	Apr 14	Oct 28
2010	May 11	Oct 4	May 10	Oct 19
2009	May 19	Oct 1	Apr 18	Oct 11
2008	May 29	Oct 5	May 28	Oct 22
2007	May 21	Oct 14	Apr 15	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.