Jefferson County, Iowa · Frost dates
Jefferson County frost dates.
First-frost, last-frost, and growing-season length for Jefferson County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-14
- 20%
- 05-08
- 50%
- 04-27
- 80%
- 04-17
- 90%
- 04-13
First fall frost
- 10%
- 09-27
- 20%
- 10-02
- 50%
- 10-12
- 80%
- 10-20
- 90%
- 10-25
28°F — killing freeze
Last spring freeze
- 10%
- 05-01
- 20%
- 04-26
- 50%
- 04-15
- 80%
- 04-05
- 90%
- 04-01
First fall freeze
- 10%
- 10-07
- 20%
- 10-13
- 50%
- 10-22
- 80%
- 10-30
- 90%
- 11-03
Growing season length (days, 28°F threshold)
- Short year
- 159
- Median
- 190
- Long year
- 216
Source NOAA station
FAIRFIELD, IA US
1.2 mi · 30 yrs of record (1991–2020) · 740 ft elev.
Data from FAIRFIELD, IA US, 1.2 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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