Mason County, Washington · Frost dates
Mason County frost dates.
First-frost, last-frost, and growing-season length for Mason County, Washington. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 8b
32°F — light freeze
Last spring frost
- 10%
- 04-17
- 20%
- 04-09
- 50%
- 03-24
- 80%
- 03-05
- 90%
- 02-26
First fall frost
- 10%
- 10-25
- 20%
- 11-01
- 50%
- 11-15
- 80%
- 12-01
- 90%
- 12-08
28°F — killing freeze
Last spring freeze
- 10%
- 03-17
- 20%
- 03-07
- 50%
- 02-20
- 80%
- 01-27
- 90%
- 01-04
First fall freeze
- 10%
- 11-09
- 20%
- 11-21
- 50%
- 12-07
- 80%
- 12-28
- 90%
- 01-13
Growing season length (days, 28°F threshold)
- Short year
- 237
- Median
- 290
- Long year
- 374
Source NOAA station
CUSHMAN POWERHOUSE #2, WA US
1.5 mi · 30 yrs of record (1991–2020) · 21 ft elev.
Data from CUSHMAN POWERHOUSE #2, WA US, 1.5 miles away with 30-year NOAA record (1991-2020).
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