Rock County, Wisconsin · Frost dates
Rock County frost dates.
First-frost, last-frost, and growing-season length for Rock County, Wisconsin. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-11
- 20%
- 05-05
- 50%
- 04-26
- 80%
- 04-17
- 90%
- 04-13
First fall frost
- 10%
- 10-01
- 20%
- 10-06
- 50%
- 10-15
- 80%
- 10-23
- 90%
- 10-27
28°F — killing freeze
Last spring freeze
- 10%
- 04-29
- 20%
- 04-25
- 50%
- 04-15
- 80%
- 04-05
- 90%
- 04-02
First fall freeze
- 10%
- 10-12
- 20%
- 10-16
- 50%
- 10-26
- 80%
- 11-03
- 90%
- 11-07
Growing season length (days, 28°F threshold)
- Short year
- 166
- Median
- 194
- Long year
- 219
Source NOAA station
AFTON - JANESVILLE WWTP, WI US
2.3 mi · 30 yrs of record (1991–2020) · 762 ft elev.
Data from AFTON - JANESVILLE WWTP, WI US, 2.3 miles away with 30-year NOAA record (1991-2020).
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