Arapahoe County, Colorado · Frost dates
Arapahoe County frost dates.
First-frost, last-frost, and growing-season length for Arapahoe County, Colorado. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-30
- 20%
- 05-23
- 50%
- 05-13
- 80%
- 05-04
- 90%
- 04-30
First fall frost
- 10%
- 09-20
- 20%
- 09-25
- 50%
- 10-02
- 80%
- 10-10
- 90%
- 10-14
28°F — killing freeze
Last spring freeze
- 10%
- 05-15
- 20%
- 05-10
- 50%
- 05-02
- 80%
- 04-23
- 90%
- 04-19
First fall freeze
- 10%
- 09-30
- 20%
- 10-03
- 50%
- 10-10
- 80%
- 10-17
- 90%
- 10-22
Growing season length (days, 28°F threshold)
- Short year
- 138
- Median
- 161
- Long year
- 186
Source NOAA station
BYERS 5 ENE, CO US
12.7 mi · 30 yrs of record (1991–2020) · 5101 ft elev.
Data from BYERS 5 ENE, CO US, 12.7 miles away with 30-year NOAA record (1991-2020).
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