Port Hope, MI: frost dates by year

Last spring and first fall frost at NOAA station USC00206663, 1998 to 2014, measured from daily minimum temperatures.

Elevation 600 ft, 43.948, -82.714. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	Apr 30	Oct 22
Earliest	Apr 19 (2001)	Oct 1 (2003)
Latest	May 25 (2009)	Nov 12 (1998)
Trend	1.5 days later per decade	3.9 days earlier per decade
Years with data	15	14

At 28°F (hard freeze) the median last spring date is Apr 23 and the median first fall date is Nov 6.

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
2014	May 5	no data	Apr 24	no data
2013	Apr 26	Oct 22	Apr 21	Oct 29
2012	Apr 29	Oct 7	Apr 29	Nov 13
2011	Apr 21	Oct 28	Apr 7	Nov 5
2010	May 10	Oct 22	Apr 23	Nov 2
2009	May 25	Oct 11	Apr 13	Oct 11
2008	Apr 30	Oct 30	Apr 30	Oct 30
2007	no data	Oct 29	no data	Nov 19
2006	Apr 29	Oct 12	Apr 28	Nov 1
2005	May 5	Oct 29	Mar 29	Nov 17
2004	May 4	Nov 9	May 4	Nov 9
2003	May 4	Oct 1	Apr 27	Nov 7
2002	May 11	Oct 14	Apr 23	Oct 14
2001	Apr 19	no data	Apr 19	no data
2000	Apr 30	Oct 9	Apr 12	Nov 19
1999	Apr 29	no data	Apr 25	no data
1998	no data	Nov 12	no data	Nov 13

"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.