Newport 4SSE, MI: frost dates by year

Last spring and first fall frost at NOAA station USC00205822, 2005 to 2021, measured from daily minimum temperatures.

Elevation 578 ft, 41.950, -83.280. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 28	Oct 25
Earliest	Apr 2 (2019)	Sep 20 (2020)
Latest	May 14 (2013)	Nov 6 (2019)
Trend	1.1 days later per decade	5.2 days earlier per decade
Years with data	16	14

At 28°F (hard freeze) the median last spring date is Apr 11 and the median first fall date is Nov 3.

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	Apr 23	no data	Apr 23	no data
2020	May 13	Sep 20	May 9	Oct 31
2019	Apr 2	Nov 6	Apr 2	Nov 6
2018	Apr 30	no data	Apr 11	no data
2017	May 10	Oct 26	Mar 24	Nov 8
2016	Apr 13	Oct 26	Apr 10	Nov 12
2015	Apr 29	Oct 17	Apr 5	Oct 18
2014	Apr 17	Oct 19	Apr 17	Nov 2
2013	May 14	Oct 23	Apr 21	Nov 12
2012	Apr 30	Nov 3	Apr 30	Nov 4
2011	Apr 14	Oct 22	Apr 1	Nov 18
2010	May 10	Nov 1	Apr 11	Nov 1
2009	Apr 13	Oct 11	Mar 21	Oct 18
2008	May 1	no data	Apr 3	no data
2007	Apr 16	Oct 29	Apr 11	Nov 23
2006	Apr 28	Oct 15	Apr 26	Oct 26
2005	no data	Oct 27	no data	Oct 28

"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.