Ellicott 7S, CO: frost dates by year

Last spring and first fall frost at NOAA station USC00052668, 2010 to 2025, measured from daily minimum temperatures.

Elevation 5,739 ft, 38.740, -104.399. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 16	Oct 5
Earliest	Mar 17 (2017)	Sep 9 (2020)
Latest	Jun 24 (2019)	Nov 18 (2015)
Trend	7.8 days later per decade	4.6 days earlier per decade
Years with data	14	15

At 28°F (hard freeze) the median last spring date is Apr 30 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
2025	May 20	Oct 5	May 3	Oct 19
2024	May 22	no data	May 22	no data
2023	Apr 29	Oct 7	Apr 24	Oct 7
2022	May 22	Oct 9	May 21	Oct 13
2021	May 25	Sep 22	Apr 24	Oct 13
2020	May 9	Sep 9	Apr 17	Sep 29
2019	Jun 24	Oct 7	May 21	Oct 7
2018	Apr 18	Oct 15	Apr 7	Oct 15
2017	Mar 17	Oct 15	Mar 17	Nov 19
2016	Apr 16	Oct 5	Mar 28	Oct 7
2015	no data	Nov 18	no data	Nov 18
2014	May 16	Oct 3	May 14	Oct 4
2013	May 7	Sep 28	May 4	Sep 28
2012	May 16	Oct 2	Apr 28	Oct 7
2011	May 20	Oct 9	May 5	Oct 18
2010	no data	Oct 3	no data	Oct 17

"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.