Jefferson County, Wisconsin · Frost dates
Jefferson County frost dates.
First-frost, last-frost, and growing-season length for Jefferson County, Wisconsin. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-09
- 20%
- 05-04
- 50%
- 04-25
- 80%
- 04-16
- 90%
- 04-12
First fall frost
- 10%
- 10-02
- 20%
- 10-08
- 50%
- 10-18
- 80%
- 10-26
- 90%
- 10-31
28°F — killing freeze
Last spring freeze
- 10%
- 04-29
- 20%
- 04-24
- 50%
- 04-15
- 80%
- 04-06
- 90%
- 04-02
First fall freeze
- 10%
- 10-15
- 20%
- 10-20
- 50%
- 10-29
- 80%
- 11-05
- 90%
- 11-10
Growing season length (days, 28°F threshold)
- Short year
- 169
- Median
- 197
- Long year
- 222
Source NOAA station
JEFFERSON WWTP, WI US
2.0 mi · 30 yrs of record (1991–2020) · 783 ft elev.
Data from JEFFERSON WWTP, WI US, 2 miles away with 30-year NOAA record (1991-2020).
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