Iowa County, Iowa · Frost dates
Iowa County frost dates.
First-frost, last-frost, and growing-season length for Iowa County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-12
- 20%
- 05-07
- 50%
- 04-28
- 80%
- 04-18
- 90%
- 04-14
First fall frost
- 10%
- 09-24
- 20%
- 09-29
- 50%
- 10-09
- 80%
- 10-17
- 90%
- 10-21
28°F — killing freeze
Last spring freeze
- 10%
- 05-02
- 20%
- 04-28
- 50%
- 04-18
- 80%
- 04-08
- 90%
- 04-04
First fall freeze
- 10%
- 10-04
- 20%
- 10-10
- 50%
- 10-19
- 80%
- 10-27
- 90%
- 10-31
Growing season length (days, 28°F threshold)
- Short year
- 155
- Median
- 184
- Long year
- 210
Source NOAA station
WILLIAMSBURG 1E, IA US
3.4 mi · 30 yrs of record (1991–2020) · 780 ft elev.
Data from WILLIAMSBURG 1E, IA US, 3.4 miles away with 30-year NOAA record (1991-2020).
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