St. Clair County, Missouri · Frost dates
St. Clair County frost dates.
First-frost, last-frost, and growing-season length for St. Clair County, Missouri. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-03
- 20%
- 04-27
- 50%
- 04-16
- 80%
- 04-05
- 90%
- 03-31
First fall frost
- 10%
- 10-10
- 20%
- 10-14
- 50%
- 10-24
- 80%
- 10-31
- 90%
- 11-03
28°F — killing freeze
Last spring freeze
- 10%
- 04-21
- 20%
- 04-16
- 50%
- 04-04
- 80%
- 03-25
- 90%
- 03-18
First fall freeze
- 10%
- 10-19
- 20%
- 10-25
- 50%
- 11-01
- 80%
- 11-08
- 90%
- 11-15
Growing season length (days, 28°F threshold)
- Short year
- 181
- Median
- 211
- Long year
- 242
Source NOAA station
OSCEOLA, MO US
4.0 mi · 30 yrs of record (1991–2020) · 744 ft elev.
Data from OSCEOLA, MO US, 4 miles away with 30-year NOAA record (1991-2020).
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