Frost history / Woodrow 6NNE, CO
Woodrow 6NNE, CO: frost dates by year
Last spring and first fall frost at NOAA station USC00059213, 2011 to 2025, measured from daily minimum temperatures.
Elevation 4,374 ft, 40.075, -103.568. Download the data (JSON), NOAA daily records
Summary at 32°F
| Last spring frost | First fall frost | |
|---|---|---|
| Median | May 15 | Oct 7 |
| Earliest | Apr 26 (2021) | Sep 9 (2020) |
| Latest | May 26 (2022) | Oct 17 (2025) |
| Trend | 2.0 days earlier per decade | 0.8 days later per decade |
| Years with data | 15 | 15 |
At 28°F (hard freeze) the median last spring date is May 3 and the median first fall date is Oct 14.
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 22 | Oct 17 | Apr 23 | Oct 19 |
| 2024 | May 9 | Oct 2 | May 9 | Oct 25 |
| 2023 | May 7 | Oct 7 | Apr 30 | Oct 7 |
| 2022 | May 26 | Oct 8 | May 2 | Oct 13 |
| 2021 | Apr 26 | Oct 11 | Apr 24 | Oct 14 |
| 2020 | May 9 | Sep 9 | Apr 21 | Oct 1 |
| 2019 | May 23 | Oct 7 | May 13 | Oct 9 |
| 2018 | Apr 28 | Sep 28 | Apr 28 | Oct 14 |
| 2017 | May 24 | Oct 7 | May 5 | Oct 10 |
| 2016 | May 3 | Sep 26 | May 3 | Oct 6 |
| 2015 | May 12 | Oct 13 | May 12 | Oct 28 |
| 2014 | May 15 | Oct 4 | May 15 | Oct 14 |
| 2013 | May 22 | Oct 5 | May 6 | Oct 16 |
| 2012 | May 15 | Oct 4 | Apr 10 | Oct 7 |
| 2011 | May 15 | Oct 10 | May 6 | Oct 19 |
"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.