Medora 7 E, ND: frost dates by year

Last spring and first fall frost at NOAA station USW00094080, 2005 to 2024, measured from daily minimum temperatures.

Elevation 2,771 ft, 46.895, -103.377. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 9	Oct 3
Earliest	Apr 13 (2007)	Sep 8 (2020)
Latest	May 22 (2022)	Oct 16 (2015)
Trend	little change (less than half a day per decade)	4.5 days later per decade
Years with data	20	20

At 28°F (hard freeze) the median last spring date is Apr 28 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
2024	May 4	Oct 1	Apr 21	Oct 25
2023	Apr 30	Oct 6	Apr 25	Oct 25
2022	May 22	Oct 6	Apr 27	Oct 7
2021	Apr 25	Oct 12	Apr 24	Oct 20
2020	May 12	Sep 8	May 11	Oct 17
2019	May 18	Oct 2	May 7	Oct 9
2018	Apr 20	Sep 28	Apr 18	Sep 28
2017	Apr 28	Oct 4	Apr 28	Oct 4
2016	May 14	Oct 5	Apr 11	Oct 12
2015	May 19	Oct 16	Apr 22	Oct 29
2014	May 12	Sep 12	Apr 17	Oct 3
2013	May 4	Oct 5	May 2	Oct 5
2012	May 11	Sep 22	Apr 18	Oct 5
2011	May 2	Sep 15	May 2	Oct 25
2010	May 8	Sep 17	May 8	Oct 26
2009	May 16	Oct 5	May 16	Oct 8
2008	May 10	Oct 11	May 3	Oct 12
2007	Apr 13	Sep 14	Apr 13	Sep 14
2006	May 5	Sep 19	May 5	Oct 10
2005	May 15	Oct 4	May 11	Oct 5

"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.