St. Charles County, Missouri · Frost dates
St. Charles County frost dates.
First-frost, last-frost, and growing-season length for St. Charles County, Missouri. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 04-25
- 20%
- 04-21
- 50%
- 04-09
- 80%
- 03-31
- 90%
- 03-27
First fall frost
- 10%
- 10-14
- 20%
- 10-18
- 50%
- 10-26
- 80%
- 11-03
- 90%
- 11-07
28°F — killing freeze
Last spring freeze
- 10%
- 04-14
- 20%
- 04-09
- 50%
- 03-31
- 80%
- 03-18
- 90%
- 03-12
First fall freeze
- 10%
- 10-25
- 20%
- 10-30
- 50%
- 11-05
- 80%
- 11-17
- 90%
- 11-22
Growing season length (days, 28°F threshold)
- Short year
- 194
- Median
- 219
- Long year
- 255
Source NOAA station
ST PETERS 2 SE, MO US
4.7 mi · 30 yrs of record (1991–2020) · 575 ft elev.
Data from ST PETERS 2 SE, MO US, 4.7 miles away with 30-year NOAA record (1991-2020).
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