Moorhead, MN: frost dates by year

Last spring and first fall frost at NOAA station USC00215586, 1991 to 2015, measured from daily minimum temperatures.

Elevation 904 ft, 46.888, -96.748. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 8	Oct 3
Earliest	Apr 18 (1998)	Sep 15 (1993)
Latest	May 24 (1992)	Oct 24 (1994)
Trend	2.0 days later per decade	1.5 days later per decade
Years with data	16	17

At 28°F (hard freeze) the median last spring date is Apr 22 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
2015	May 19	Oct 7	Apr 23	Oct 16
2014	May 16	Oct 4	Apr 17	Oct 9
2013	May 12	Oct 16	May 12	Oct 25
2012	Apr 26	Sep 23	Apr 17	Sep 23
2011	May 3	Sep 15	May 1	Oct 20
2010	May 9	Oct 15	Apr 11	Oct 28
2009	May 10	Oct 8	Apr 10	Oct 9
2001	Apr 23	no data	Apr 22	no data
2000	no data	Oct 4	no data	Oct 6
1999	Apr 23	Oct 1	Apr 23	Oct 2
1998	Apr 18	Oct 1	Apr 3	Nov 2
1997	May 21	Oct 13	Apr 17	Oct 21
1996	May 11	Oct 2	May 11	Oct 3
1995	Apr 26	Sep 20	Apr 10	Sep 22
1994	May 7	Oct 24	May 6	Oct 25
1993	May 2	Sep 15	Apr 25	Sep 29
1992	May 24	Sep 28	Apr 22	Sep 28
1991	no data	Oct 3	no data	Oct 7

"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.