Portage County, Wisconsin · Frost dates
Portage County frost dates.
First-frost, last-frost, and growing-season length for Portage County, Wisconsin. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-20
- 20%
- 05-15
- 50%
- 05-04
- 80%
- 04-26
- 90%
- 04-22
First fall frost
- 10%
- 09-24
- 20%
- 09-28
- 50%
- 10-07
- 80%
- 10-17
- 90%
- 10-22
28°F — killing freeze
Last spring freeze
- 10%
- 05-11
- 20%
- 05-04
- 50%
- 04-25
- 80%
- 04-14
- 90%
- 04-10
First fall freeze
- 10%
- 10-02
- 20%
- 10-07
- 50%
- 10-19
- 80%
- 10-29
- 90%
- 11-02
Growing season length (days, 28°F threshold)
- Short year
- 144
- Median
- 177
- Long year
- 206
Source NOAA station
STEVENS PT, WI US
4.9 mi · 30 yrs of record (1991–2020) · 1079 ft elev.
Data from STEVENS PT, WI US, 4.9 miles away with 30-year NOAA record (1991-2020).
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