Brown County, Illinois · Frost dates
Brown County frost dates.
First-frost, last-frost, and growing-season length for Brown County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-05
- 20%
- 04-29
- 50%
- 04-18
- 80%
- 04-08
- 90%
- 04-04
First fall frost
- 10%
- 09-30
- 20%
- 10-05
- 50%
- 10-15
- 80%
- 10-24
- 90%
- 10-28
28°F — killing freeze
Last spring freeze
- 10%
- 04-24
- 20%
- 04-18
- 50%
- 04-06
- 80%
- 03-29
- 90%
- 03-22
First fall freeze
- 10%
- 10-12
- 20%
- 10-18
- 50%
- 10-27
- 80%
- 11-03
- 90%
- 11-08
Growing season length (days, 28°F threshold)
- Short year
- 171
- Median
- 204
- Long year
- 231
Source NOAA station
PERRY 6 NW, IL US
11.5 mi · 30 yrs of record (1991–2020) · 650 ft elev.
Data from PERRY 6 NW, IL US, 11.5 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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