Lusk 25NE, WY: frost dates by year

Last spring and first fall frost at NOAA station USC00485833, 2003 to 2019, measured from daily minimum temperatures.

Elevation 4,136 ft, 42.937, -104.067. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 13	Oct 1
Earliest	Apr 21 (2007)	Sep 11 (2014)
Latest	May 23 (2019)	Oct 16 (2015)
Trend	3.2 days later per decade	1.6 days later per decade
Years with data	14	14

At 28°F (hard freeze) the median last spring date is May 6 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
2019	May 23	no data	May 3	no data
2018	May 1	Sep 26	Apr 25	Oct 4
2017	May 1	Sep 28	Apr 30	Oct 4
2016	May 18	Oct 5	May 17	Oct 5
2015	May 22	Oct 16	May 12	Oct 27
2014	May 19	Sep 11	Apr 15	Oct 3
2013	May 6	Sep 28	May 5	Oct 5
2012	May 12	Oct 4	May 12	Oct 4
2011	May 13	Oct 13	May 3	Oct 19
2010	May 13	Oct 13	May 8	Oct 28
2008	May 11	no data	May 11	no data
2007	Apr 21	Sep 14	Apr 21	Oct 21
2006	no data	Sep 19	no data	Oct 12
2005	May 14	Oct 5	May 13	Oct 6
2004	May 14	Oct 16	May 14	Oct 18
2003	no data	Sep 18	no data	Oct 15

"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.