Piatt County, Illinois · Frost dates
Piatt County frost dates.
First-frost, last-frost, and growing-season length for Piatt County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-09
- 20%
- 05-03
- 50%
- 04-23
- 80%
- 04-13
- 90%
- 04-09
First fall frost
- 10%
- 09-28
- 20%
- 10-03
- 50%
- 10-13
- 80%
- 10-22
- 90%
- 10-25
28°F — killing freeze
Last spring freeze
- 10%
- 04-28
- 20%
- 04-22
- 50%
- 04-11
- 80%
- 04-02
- 90%
- 03-29
First fall freeze
- 10%
- 10-08
- 20%
- 10-14
- 50%
- 10-23
- 80%
- 10-31
- 90%
- 11-04
Growing season length (days, 28°F threshold)
- Short year
- 163
- Median
- 195
- Long year
- 220
Source NOAA station
CHAMPAIGN 9 SW, IL US
12.0 mi · 30 yrs of record (1991–2020) · 700 ft elev.
Data from CHAMPAIGN 9 SW, IL US, 12 miles away with 30-year NOAA record (1991-2020).
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