Massac County, Illinois · Frost dates
Massac County frost dates.
First-frost, last-frost, and growing-season length for Massac County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 04-23
- 20%
- 04-17
- 50%
- 04-06
- 80%
- 03-28
- 90%
- 03-21
First fall frost
- 10%
- 10-15
- 20%
- 10-20
- 50%
- 10-27
- 80%
- 11-04
- 90%
- 11-09
28°F — killing freeze
Last spring freeze
- 10%
- 04-11
- 20%
- 04-06
- 50%
- 03-27
- 80%
- 03-15
- 90%
- 03-08
First fall freeze
- 10%
- 10-24
- 20%
- 10-28
- 50%
- 11-05
- 80%
- 11-14
- 90%
- 11-21
Growing season length (days, 28°F threshold)
- Short year
- 196
- Median
- 223
- Long year
- 258
Source NOAA station
BROOKPORT DAM 52, IL US
6.8 mi · 30 yrs of record (1991–2020) · 330 ft elev.
Data from BROOKPORT DAM 52, IL US, 6.8 miles away with 30-year NOAA record (1991-2020).
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