San Juan County, Colorado · Frost dates
San Juan County frost dates.
First-frost, last-frost, and growing-season length for San Juan County, Colorado. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- —
- 20%
- —
- 50%
- —
- 80%
- —
- 90%
- —
First fall frost
- 10%
- —
- 20%
- —
- 50%
- —
- 80%
- —
- 90%
- —
28°F — killing freeze
Last spring freeze
- 10%
- 07-05
- 20%
- 07-01
- 50%
- 06-22
- 80%
- 06-14
- 90%
- 06-09
First fall freeze
- 10%
- 08-26
- 20%
- 09-01
- 50%
- 09-09
- 80%
- 09-16
- 90%
- 09-20
Growing season length (days, 28°F threshold)
- Short year
- 52
- Median
- 79
- Long year
- 103
Source NOAA station
SILVERTON, CO US
2.0 mi · 30 yrs of record (1991–2020) · 9285 ft elev.
Data from SILVERTON, CO US, 2 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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