Chatham 1 Se, MI: frost dates by year

Last spring and first fall frost at NOAA station USW00054810, 2005 to 2024, measured from daily minimum temperatures.

Elevation 875 ft, 46.334, -86.920. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 26	Sep 23
Earliest	May 10 (2010)	Sep 5 (2011)
Latest	Jun 6 (2015)	Oct 18 (2021)
Trend	2.6 days later per decade	6.3 days later per decade
Years with data	20	20

At 28°F (hard freeze) the median last spring date is May 13 and the median first fall date is Oct 13.

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
2024	May 30	Oct 9	Apr 25	Oct 10
2023	May 25	Oct 17	May 25	Oct 29
2022	May 24	Sep 23	May 5	Oct 10
2021	May 29	Oct 18	May 29	Oct 27
2020	May 31	Sep 17	May 13	Oct 15
2019	Jun 3	Oct 4	May 8	Oct 18
2018	May 18	Sep 29	May 12	Oct 13
2017	May 20	Sep 9	May 9	Oct 25
2016	May 19	Oct 13	May 18	Oct 14
2015	Jun 6	Sep 13	May 22	Oct 1
2014	May 18	Sep 22	May 17	Oct 11
2013	Jun 4	Sep 17	May 13	Oct 14
2012	May 31	Sep 19	May 31	Oct 8
2011	May 27	Sep 5	May 4	Sep 16
2010	May 10	Sep 20	May 10	Nov 1
2009	Jun 6	Sep 19	May 17	Oct 1
2008	May 28	Oct 3	May 28	Oct 16
2007	May 21	Oct 13	May 13	Oct 14
2006	May 23	Sep 10	May 23	Oct 12
2005	May 17	Oct 8	May 12	Oct 9

"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.