Jefferson County, Oregon · Frost dates
Jefferson County frost dates.
First-frost, last-frost, and growing-season length for Jefferson County, Oregon. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 8b
32°F — light freeze
Last spring frost
- 10%
- 06-07
- 20%
- 05-31
- 50%
- 05-19
- 80%
- 05-07
- 90%
- 05-02
First fall frost
- 10%
- 09-20
- 20%
- 09-24
- 50%
- 10-04
- 80%
- 10-13
- 90%
- 10-18
28°F — killing freeze
Last spring freeze
- 10%
- 05-20
- 20%
- 05-13
- 50%
- 05-02
- 80%
- 04-25
- 90%
- 04-20
First fall freeze
- 10%
- 10-01
- 20%
- 10-06
- 50%
- 10-17
- 80%
- 10-27
- 90%
- 11-01
Growing season length (days, 28°F threshold)
- Short year
- 134
- Median
- 168
- Long year
- 195
Source NOAA station
MADRAS 2 N, OR US
2.0 mi · 30 yrs of record (1991–2020) · 2443 ft elev.
Data from MADRAS 2 N, OR US, 2 miles away with 30-year NOAA record (1991-2020).
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