Washington County, Missouri · Frost dates
Washington County frost dates.
First-frost, last-frost, and growing-season length for Washington County, Missouri. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 04-30
- 20%
- 04-24
- 50%
- 04-11
- 80%
- 03-31
- 90%
- 03-26
First fall frost
- 10%
- 10-14
- 20%
- 10-19
- 50%
- 10-28
- 80%
- 11-03
- 90%
- 11-08
28°F — killing freeze
Last spring freeze
- 10%
- 04-16
- 20%
- 04-09
- 50%
- 03-31
- 80%
- 03-20
- 90%
- 03-14
First fall freeze
- 10%
- 10-24
- 20%
- 10-29
- 50%
- 11-04
- 80%
- 11-15
- 90%
- 11-21
Growing season length (days, 28°F threshold)
- Short year
- 191
- Median
- 218
- Long year
- 252
Source NOAA station
POTOSI 4 SW, MO US
4.4 mi · 30 yrs of record (1991–2020) · 1105 ft elev.
Data from POTOSI 4 SW, MO US, 4.4 miles away with 30-year NOAA record (1991-2020).
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