Franklin County, Illinois · Frost dates
Franklin County frost dates.
First-frost, last-frost, and growing-season length for Franklin County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 04-21
- 20%
- 04-15
- 50%
- 04-04
- 80%
- 03-26
- 90%
- 03-19
First fall frost
- 10%
- 10-15
- 20%
- 10-19
- 50%
- 10-28
- 80%
- 11-04
- 90%
- 11-10
28°F — killing freeze
Last spring freeze
- 10%
- 04-10
- 20%
- 04-04
- 50%
- 03-25
- 80%
- 03-13
- 90%
- 03-06
First fall freeze
- 10%
- 10-26
- 20%
- 10-30
- 50%
- 11-07
- 80%
- 11-20
- 90%
- 11-26
Growing season length (days, 28°F threshold)
- Short year
- 199
- Median
- 227
- Long year
- 265
Source NOAA station
BENTON 2 N, IL US
2.9 mi · 30 yrs of record (1991–2020) · 445 ft elev.
Data from BENTON 2 N, IL US, 2.9 miles away with 30-year NOAA record (1991-2020).
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