Cortez 8 Se, CO: frost dates by year

Last spring and first fall frost at NOAA station USW00003061, 2006 to 2024, measured from daily minimum temperatures.

Elevation 8,034 ft, 37.255, -108.504. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 12	Oct 11
Earliest	Apr 16 (2012)	Sep 10 (2020)
Latest	Jun 9 (2020)	Nov 17 (2016)
Trend	1.2 days earlier per decade	9.6 days later per decade
Years with data	19	18

At 28°F (hard freeze) the median last spring date is May 2 and the median first fall date is Oct 13.

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 8	Oct 29	May 8	Oct 30
2023	Apr 26	no data	Apr 21	no data
2022	May 12	Oct 23	May 4	Oct 23
2021	Apr 28	Oct 12	Apr 20	Oct 12
2020	Jun 9	Sep 10	Apr 15	Oct 25
2019	May 28	Oct 10	May 20	Oct 10
2018	May 3	Oct 14	Apr 18	Oct 14
2017	May 20	Oct 9	May 19	Oct 9
2016	May 7	Nov 17	Apr 26	Nov 17
2015	May 16	Oct 31	Apr 18	Nov 4
2014	May 14	Oct 2	May 13	Nov 3
2013	May 2	Sep 28	May 2	Oct 4
2012	Apr 16	Oct 13	Apr 15	Oct 25
2011	May 20	Oct 6	May 2	Oct 8
2010	May 24	Oct 25	May 11	Oct 25
2009	Apr 27	Sep 30	Apr 26	Oct 1
2008	Jun 5	Oct 11	May 2	Oct 12
2007	May 24	Sep 30	May 5	Oct 7
2006	Apr 24	Sep 17	Apr 19	Sep 23

"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.