Washington County, Oregon · Frost dates
Washington County frost dates.
First-frost, last-frost, and growing-season length for Washington County, Oregon. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 8b
32°F — light freeze
Last spring frost
- 10%
- 05-05
- 20%
- 04-30
- 50%
- 04-16
- 80%
- 04-01
- 90%
- 03-26
First fall frost
- 10%
- 10-06
- 20%
- 10-13
- 50%
- 10-26
- 80%
- 11-07
- 90%
- 11-14
28°F — killing freeze
Last spring freeze
- 10%
- 04-12
- 20%
- 04-03
- 50%
- 03-19
- 80%
- 02-28
- 90%
- 02-21
First fall freeze
- 10%
- 10-23
- 20%
- 10-29
- 50%
- 11-11
- 80%
- 11-27
- 90%
- 12-05
Growing season length (days, 28°F threshold)
- Short year
- 194
- Median
- 237
- Long year
- 287
Source NOAA station
FOREST GROVE, OR US
2.0 mi · 30 yrs of record (1991–2020) · 180 ft elev.
Data from FOREST GROVE, OR US, 2 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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