Henry County, Illinois · Frost dates
Henry County frost dates.
First-frost, last-frost, and growing-season length for Henry County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-06
- 20%
- 05-01
- 50%
- 04-20
- 80%
- 04-10
- 90%
- 04-06
First fall frost
- 10%
- 10-05
- 20%
- 10-11
- 50%
- 10-20
- 80%
- 10-27
- 90%
- 10-31
28°F — killing freeze
Last spring freeze
- 10%
- 04-25
- 20%
- 04-19
- 50%
- 04-09
- 80%
- 03-31
- 90%
- 03-25
First fall freeze
- 10%
- 10-17
- 20%
- 10-22
- 50%
- 10-30
- 80%
- 11-07
- 90%
- 11-11
Growing season length (days, 28°F threshold)
- Short year
- 175
- Median
- 204
- Long year
- 231
Source NOAA station
GENESEO, IL US
7.0 mi · 30 yrs of record (1991–2020) · 639 ft elev.
Data from GENESEO, IL US, 7 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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