Greene County, Iowa · Frost dates
Greene County frost dates.
First-frost, last-frost, and growing-season length for Greene County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-08
- 20%
- 05-04
- 50%
- 04-26
- 80%
- 04-17
- 90%
- 04-12
First fall frost
- 10%
- 09-23
- 20%
- 09-28
- 50%
- 10-09
- 80%
- 10-19
- 90%
- 10-24
28°F — killing freeze
Last spring freeze
- 10%
- 04-29
- 20%
- 04-24
- 50%
- 04-15
- 80%
- 04-06
- 90%
- 04-01
First fall freeze
- 10%
- 10-03
- 20%
- 10-11
- 50%
- 10-21
- 80%
- 10-29
- 90%
- 11-02
Growing season length (days, 28°F threshold)
- Short year
- 157
- Median
- 189
- Long year
- 215
Source NOAA station
JEFFERSON, IA US
2.3 mi · 30 yrs of record (1991–2020) · 1055 ft elev.
Data from JEFFERSON, IA US, 2.3 miles away with 30-year NOAA record (1991-2020).
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