Wellston 1N, MI: frost dates by year

Last spring and first fall frost at NOAA station USC00208774, 2003 to 2021, measured from daily minimum temperatures.

Elevation 773 ft, 44.229, -85.957. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 29	Sep 25
Earliest	May 12 (2018)	Aug 31 (2009)
Latest	Jun 4 (2019)	Oct 14 (2018)
Trend	2.1 days earlier per decade	15.0 days later per decade
Years with data	16	14

At 28°F (hard freeze) the median last spring date is May 20 and the median first fall date is Oct 9.

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
2021	May 30	no data	May 30	no data
2020	Jun 1	Sep 18	Jun 1	Oct 2
2019	Jun 4	Oct 5	Jun 3	Oct 15
2018	May 12	Oct 14	May 1	Oct 16
2017	May 21	Sep 30	May 10	Oct 26
2016	May 19	Oct 9	May 19	Oct 25
2015	Jun 1	Oct 1	May 22	Oct 18
2014	May 18	Sep 14	May 17	Oct 9
2013	Jun 3	Sep 14	May 24	Oct 28
2012	May 22	Sep 19	May 10	Oct 8
2011	May 27	Sep 15	May 27	Oct 2
2010	May 15	Oct 1	May 10	Oct 3
2009	Jun 4	Aug 31	May 18	Oct 1
2008	May 29	Oct 3	May 29	Oct 4
2004	May 29	no data	May 5	no data
2003	Jun 2	Sep 5	Jun 1	Oct 1

"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.