Grand County, Colorado · Frost dates
Grand County frost dates.
First-frost, last-frost, and growing-season length for Grand County, Colorado. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 06-25
- 20%
- 06-22
- 50%
- 06-12
- 80%
- 06-04
- 90%
- 05-31
First fall frost
- 10%
- 08-31
- 20%
- 09-03
- 50%
- 09-10
- 80%
- 09-17
- 90%
- 09-21
28°F — killing freeze
Last spring freeze
- 10%
- 06-09
- 20%
- 06-05
- 50%
- 05-26
- 80%
- 05-17
- 90%
- 05-13
First fall freeze
- 10%
- 09-08
- 20%
- 09-12
- 50%
- 09-20
- 80%
- 09-28
- 90%
- 10-03
Growing season length (days, 28°F threshold)
- Short year
- 91
- Median
- 117
- Long year
- 143
Source NOAA station
WILLIAMS FORK DAM, CO US
7.2 mi · 30 yrs of record (1991–2020) · 7618 ft elev.
Data from WILLIAMS FORK DAM, CO US, 7.2 miles away with 30-year NOAA record (1991-2020).
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