Iroquois County, Illinois · Frost dates
Iroquois County frost dates.
First-frost, last-frost, and growing-season length for Iroquois County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-10
- 20%
- 05-04
- 50%
- 04-24
- 80%
- 04-15
- 90%
- 04-10
First fall frost
- 10%
- 10-01
- 20%
- 10-07
- 50%
- 10-16
- 80%
- 10-25
- 90%
- 10-28
28°F — killing freeze
Last spring freeze
- 10%
- 04-29
- 20%
- 04-23
- 50%
- 04-12
- 80%
- 04-03
- 90%
- 03-30
First fall freeze
- 10%
- 10-13
- 20%
- 10-18
- 50%
- 10-26
- 80%
- 11-02
- 90%
- 11-08
Growing season length (days, 28°F threshold)
- Short year
- 167
- Median
- 197
- Long year
- 223
Source NOAA station
WATSEKA 2 NW, IL US
5.2 mi · 30 yrs of record (1991–2020) · 620 ft elev.
Data from WATSEKA 2 NW, IL US, 5.2 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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