Knox County, Maine · Frost dates
Knox County frost dates.
First-frost, last-frost, and growing-season length for Knox County, Maine. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-08
- 20%
- 05-03
- 50%
- 04-27
- 80%
- 04-20
- 90%
- 04-17
First fall frost
- 10%
- 10-10
- 20%
- 10-16
- 50%
- 10-25
- 80%
- 11-02
- 90%
- 11-06
28°F — killing freeze
Last spring freeze
- 10%
- 04-24
- 20%
- 04-21
- 50%
- 04-14
- 80%
- 04-06
- 90%
- 04-03
First fall freeze
- 10%
- 10-25
- 20%
- 10-30
- 50%
- 11-06
- 80%
- 11-15
- 90%
- 11-19
Growing season length (days, 28°F threshold)
- Short year
- 184
- Median
- 206
- Long year
- 230
Source NOAA station
TENANTS HARBOR, ME US
9.5 mi · 30 yrs of record (1991–2020) · 21 ft elev.
Data from TENANTS HARBOR, ME US, 9.5 miles away with 30-year NOAA record (1991-2020).
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