Genoa, CO: frost dates by year

Last spring and first fall frost at NOAA station USC00053258, 1970 to 2025, measured from daily minimum temperatures.

Elevation 5,593 ft, 39.277, -103.494. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 12	Oct 7
Earliest	Apr 16 (2012)	Sep 8 (2020)
Latest	May 24 (2019)	Oct 28 (2015)
Trend	2.7 days earlier per decade	4.7 days later per decade
Years with data	16	15

At 28°F (hard freeze) the median last spring date is Apr 30 and the median first fall date is Oct 10.

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
2025	Apr 28	Oct 18	Apr 20	Oct 29
2023	Apr 30	Oct 14	Apr 23	Oct 14
2022	May 21	no data	Apr 25	no data
2021	May 12	no data	Apr 24	no data
2020	no data	Sep 8	no data	Sep 9
2019	May 24	Oct 10	May 24	Oct 10
2018	Apr 25	no data	Apr 25	no data
2017	May 20	no data	Apr 30	no data
2016	May 2	Oct 7	May 2	Oct 7
2015	May 11	Oct 28	May 11	Nov 7
2014	no data	Sep 12	no data	Oct 31
2013	May 3	Oct 5	May 2	Oct 5
2012	Apr 16	Oct 4	Apr 7	Oct 7
2011	May 16	Oct 18	May 2	Oct 26
2010	May 13	Oct 26	May 13	Oct 27
2009	Apr 27	Oct 2	Apr 10	Oct 9
2004	May 14	Oct 14	Apr 30	Oct 31
1971	May 23	Sep 17	May 19	Sep 17
1970	no data	Sep 10	no data	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.