Jefferson County, Colorado · Frost dates
Jefferson County frost dates.
First-frost, last-frost, and growing-season length for Jefferson County, Colorado. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 06-10
- 20%
- 06-02
- 50%
- 05-23
- 80%
- 05-14
- 90%
- 05-09
First fall frost
- 10%
- 09-06
- 20%
- 09-13
- 50%
- 09-22
- 80%
- 09-30
- 90%
- 10-03
28°F — killing freeze
Last spring freeze
- 10%
- 05-22
- 20%
- 05-18
- 50%
- 05-09
- 80%
- 05-02
- 90%
- 04-29
First fall freeze
- 10%
- 09-18
- 20%
- 09-24
- 50%
- 10-02
- 80%
- 10-10
- 90%
- 10-15
Growing season length (days, 28°F threshold)
- Short year
- 119
- Median
- 146
- Long year
- 169
Source NOAA station
EVERGREEN, CO US
5.5 mi · 30 yrs of record (1991–2020) · 6985 ft elev.
Data from EVERGREEN, CO US, 5.5 miles away with 30-year NOAA record (1991-2020).
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