Paradox 2N, CO: frost dates by year

Last spring and first fall frost at NOAA station USC00056320, 2005 to 2024, measured from daily minimum temperatures.

Elevation 5,447 ft, 38.390, -108.949. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 7	Oct 7
Earliest	Apr 26 (2018)	Sep 17 (2006)
Latest	May 31 (2006)	Oct 28 (2015)
Trend	7.3 days earlier per decade	8.4 days later per decade
Years with data	19	19

At 28°F (hard freeze) the median last spring date is Apr 25 and the median first fall date is Oct 12.

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 23	no data	May 10	no data
2023	Apr 30	Oct 15	Apr 22	Oct 30
2022	May 5	Oct 24	May 4	Oct 25
2021	May 13	Oct 12	Apr 25	Oct 17
2020	Apr 26	Oct 12	Apr 18	Oct 26
2019	May 3	Oct 4	Apr 15	Oct 7
2018	Apr 26	Oct 15	Apr 19	Oct 15
2017	May 20	Sep 26	Apr 29	Oct 10
2016	May 4	Oct 4	Apr 20	Oct 8
2015	May 12	Oct 28	Apr 16	Nov 6
2014	May 16	Oct 14	May 15	Oct 29
2013	May 5	Sep 28	May 4	Oct 5
2012	May 1	Oct 7	Apr 18	Oct 7
2011	May 7	Oct 7	May 6	Oct 7
2010	May 26	Oct 26	May 8	Oct 26
2009	Apr 28	Sep 22	Apr 28	Oct 2
2008	May 15	Oct 12	May 4	Oct 12
2007	May 25	Sep 30	Apr 23	Oct 7
2006	May 31	Sep 17	Apr 22	Sep 19
2005	no data	Oct 5	no data	Oct 31

"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.