Hamilton County, Illinois · Frost dates
Hamilton County frost dates.
First-frost, last-frost, and growing-season length for Hamilton County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 04-26
- 20%
- 04-22
- 50%
- 04-11
- 80%
- 03-31
- 90%
- 03-27
First fall frost
- 10%
- 10-06
- 20%
- 10-12
- 50%
- 10-21
- 80%
- 10-28
- 90%
- 11-01
28°F — killing freeze
Last spring freeze
- 10%
- 04-17
- 20%
- 04-12
- 50%
- 04-01
- 80%
- 03-21
- 90%
- 03-16
First fall freeze
- 10%
- 10-17
- 20%
- 10-22
- 50%
- 10-30
- 80%
- 11-06
- 90%
- 11-10
Growing season length (days, 28°F threshold)
- Short year
- 183
- Median
- 212
- Long year
- 239
Source NOAA station
MCLEANSBORO, IL US
0.2 mi · 30 yrs of record (1991–2020) · 446 ft elev.
Data from MCLEANSBORO, IL US, 0.2 miles away with 30-year NOAA record (1991-2020).
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