Winnebago County, Illinois · Frost dates
Winnebago County frost dates.
First-frost, last-frost, and growing-season length for Winnebago County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-08
- 20%
- 05-02
- 50%
- 04-24
- 80%
- 04-15
- 90%
- 04-10
First fall frost
- 10%
- 10-02
- 20%
- 10-08
- 50%
- 10-17
- 80%
- 10-26
- 90%
- 10-30
28°F — killing freeze
Last spring freeze
- 10%
- 04-27
- 20%
- 04-22
- 50%
- 04-13
- 80%
- 04-03
- 90%
- 03-31
First fall freeze
- 10%
- 10-14
- 20%
- 10-20
- 50%
- 10-28
- 80%
- 11-05
- 90%
- 11-10
Growing season length (days, 28°F threshold)
- Short year
- 170
- Median
- 198
- Long year
- 224
Source NOAA station
ROCKFORD GTR ROCKFORD AP, IL US
10.6 mi · 30 yrs of record (1991–2020) · 730 ft elev.
Data from ROCKFORD GTR ROCKFORD AP, IL US, 10.6 miles away with 30-year NOAA record (1991-2020).
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