Oregon County, Missouri · Frost dates
Oregon County frost dates.
First-frost, last-frost, and growing-season length for Oregon County, Missouri. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-01
- 20%
- 04-27
- 50%
- 04-17
- 80%
- 04-04
- 90%
- 03-30
First fall frost
- 10%
- 10-07
- 20%
- 10-12
- 50%
- 10-21
- 80%
- 10-30
- 90%
- 11-03
28°F — killing freeze
Last spring freeze
- 10%
- 04-22
- 20%
- 04-17
- 50%
- 04-05
- 80%
- 03-24
- 90%
- 03-17
First fall freeze
- 10%
- 10-16
- 20%
- 10-20
- 50%
- 10-30
- 80%
- 11-07
- 90%
- 11-14
Growing season length (days, 28°F threshold)
- Short year
- 177
- Median
- 208
- Long year
- 242
Source NOAA station
ALTON, MO US
0.5 mi · 30 yrs of record (1991–2020) · 813 ft elev.
Data from ALTON, MO US, 0.5 miles away with 30-year NOAA record (1991-2020).
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