St. Louis County, Missouri · Frost dates
St. Louis County frost dates.
First-frost, last-frost, and growing-season length for St. Louis County, Missouri. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 04-21
- 20%
- 04-14
- 50%
- 04-04
- 80%
- 03-27
- 90%
- 03-20
First fall frost
- 10%
- 10-15
- 20%
- 10-20
- 50%
- 10-29
- 80%
- 11-06
- 90%
- 11-11
28°F — killing freeze
Last spring freeze
- 10%
- 04-08
- 20%
- 04-03
- 50%
- 03-25
- 80%
- 03-13
- 90%
- 03-08
First fall freeze
- 10%
- 10-27
- 20%
- 11-01
- 50%
- 11-08
- 80%
- 11-21
- 90%
- 11-27
Growing season length (days, 28°F threshold)
- Short year
- 202
- Median
- 228
- Long year
- 264
Source NOAA station
ST CHARLES 7 SSW, MO US
5.2 mi · 30 yrs of record (1991–2020) · 450 ft elev.
Data from ST CHARLES 7 SSW, MO US, 5.2 miles away with 30-year NOAA record (1991-2020).
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