Moran, MI: frost dates by year

Last spring and first fall frost at NOAA station USC00205591, 2003 to 2020, measured from daily minimum temperatures.

Elevation 695 ft, 45.990, -84.836. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 25	Sep 30
Earliest	May 11 (2010)	Sep 15 (2007)
Latest	Jun 25 (2004)	Oct 16 (2017)
Trend	6.7 days earlier per decade	1.5 days later per decade
Years with data	17	18

At 28°F (hard freeze) the median last spring date is May 13 and the median first fall date is Oct 11.

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
2020	May 31	Sep 18	May 13	Oct 3
2019	Jun 3	Oct 5	May 11	Oct 30
2018	May 13	Sep 22	May 12	Oct 18
2017	May 20	Oct 16	May 9	Oct 16
2016	May 19	Oct 9	May 9	Oct 26
2015	May 23	Oct 10	May 23	Oct 17
2014	May 18	Oct 10	May 18	Oct 11
2013	Jun 4	Sep 16	May 24	Oct 23
2012	Jun 13	Sep 19	May 17	Oct 7
2011	May 25	Sep 16	May 4	Sep 16
2010	May 11	Oct 3	May 10	Oct 3
2009	Jun 4	Oct 1	May 30	Oct 1
2008	May 28	Oct 3	May 28	Oct 17
2007	Jun 6	Sep 15	Jun 6	Oct 12
2006	May 23	Sep 29	May 6	Oct 13
2005	May 17	Oct 8	May 12	Oct 8
2004	Jun 25	Sep 29	May 29	Oct 5
2003	no data	Sep 29	no data	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.