Mercer County, Illinois · Frost dates
Mercer County frost dates.
First-frost, last-frost, and growing-season length for Mercer 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%
- 05-02
- 50%
- 04-22
- 80%
- 04-12
- 90%
- 04-07
First fall frost
- 10%
- 10-06
- 20%
- 10-12
- 50%
- 10-19
- 80%
- 10-27
- 90%
- 10-31
28°F — killing freeze
Last spring freeze
- 10%
- 04-29
- 20%
- 04-22
- 50%
- 04-11
- 80%
- 04-02
- 90%
- 03-29
First fall freeze
- 10%
- 10-16
- 20%
- 10-20
- 50%
- 10-29
- 80%
- 11-05
- 90%
- 11-10
Growing season length (days, 28°F threshold)
- Short year
- 170
- Median
- 201
- Long year
- 226
Source NOAA station
ALEDO, IL US
0.6 mi · 30 yrs of record (1991–2020) · 730 ft elev.
Data from ALEDO, IL US, 0.6 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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