Putnam County, Illinois · Frost dates
Putnam County frost dates.
First-frost, last-frost, and growing-season length for Putnam County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-03
- 20%
- 04-29
- 50%
- 04-18
- 80%
- 04-08
- 90%
- 04-03
First fall frost
- 10%
- 10-07
- 20%
- 10-14
- 50%
- 10-22
- 80%
- 10-30
- 90%
- 11-03
28°F — killing freeze
Last spring freeze
- 10%
- 04-21
- 20%
- 04-17
- 50%
- 04-06
- 80%
- 03-28
- 90%
- 03-21
First fall freeze
- 10%
- 10-20
- 20%
- 10-24
- 50%
- 11-01
- 80%
- 11-11
- 90%
- 11-17
Growing season length (days, 28°F threshold)
- Short year
- 182
- Median
- 209
- Long year
- 241
Source NOAA station
HENNEPIN, IL US
4.3 mi · 30 yrs of record (1991–2020) · 515 ft elev.
Data from HENNEPIN, IL US, 4.3 miles away with 30-year NOAA record (1991-2020).
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