Henderson County, Illinois · Frost dates
Henderson County frost dates.
First-frost, last-frost, and growing-season length for Henderson County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 04-23
- 20%
- 04-18
- 50%
- 04-08
- 80%
- 04-01
- 90%
- 03-26
First fall frost
- 10%
- 10-17
- 20%
- 10-21
- 50%
- 10-29
- 80%
- 11-05
- 90%
- 11-10
28°F — killing freeze
Last spring freeze
- 10%
- 04-13
- 20%
- 04-08
- 50%
- 03-31
- 80%
- 03-20
- 90%
- 03-14
First fall freeze
- 10%
- 10-27
- 20%
- 10-31
- 50%
- 11-07
- 80%
- 11-16
- 90%
- 11-21
Growing season length (days, 28°F threshold)
- Short year
- 197
- Median
- 221
- Long year
- 252
Source NOAA station
GLADSTONE DAM 18, IL US
6.3 mi · 30 yrs of record (1991–2020) · 538 ft elev.
Data from GLADSTONE DAM 18, IL US, 6.3 miles away with 30-year NOAA record (1991-2020).
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