Monona County, Iowa · Frost dates
Monona County frost dates.
First-frost, last-frost, and growing-season length for Monona County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-07
- 20%
- 05-02
- 50%
- 04-25
- 80%
- 04-15
- 90%
- 04-11
First fall frost
- 10%
- 09-28
- 20%
- 10-02
- 50%
- 10-12
- 80%
- 10-22
- 90%
- 10-27
28°F — killing freeze
Last spring freeze
- 10%
- 04-28
- 20%
- 04-23
- 50%
- 04-15
- 80%
- 04-05
- 90%
- 04-01
First fall freeze
- 10%
- 10-07
- 20%
- 10-14
- 50%
- 10-23
- 80%
- 11-01
- 90%
- 11-04
Growing season length (days, 28°F threshold)
- Short year
- 162
- Median
- 191
- Long year
- 217
Source NOAA station
CASTANA EXP FARM, IA US
6.2 mi · 30 yrs of record (1991–2020) · 1400 ft elev.
Data from CASTANA EXP FARM, IA US, 6.2 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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