Summit County, Colorado · Frost dates
Summit County frost dates.
First-frost, last-frost, and growing-season length for Summit 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%
- 07-06
- 20%
- 06-30
- 50%
- 06-18
- 80%
- 06-09
- 90%
- 06-05
First fall freeze
- 10%
- 08-24
- 20%
- 08-30
- 50%
- 09-06
- 80%
- 09-15
- 90%
- 09-19
Growing season length (days, 28°F threshold)
- Short year
- 49
- Median
- 80
- Long year
- 106
Source NOAA station
DILLON 1 E, CO US
5.5 mi · 30 yrs of record (1991–2020) · 9065 ft elev.
Data from DILLON 1 E, CO US, 5.5 miles away with 30-year NOAA record (1991-2020).
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