Washington County, Iowa · Frost dates
Washington County frost dates.
First-frost, last-frost, and growing-season length for Washington County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-11
- 20%
- 05-06
- 50%
- 04-28
- 80%
- 04-18
- 90%
- 04-13
First fall frost
- 10%
- 09-25
- 20%
- 10-01
- 50%
- 10-11
- 80%
- 10-19
- 90%
- 10-24
28°F — killing freeze
Last spring freeze
- 10%
- 05-02
- 20%
- 04-27
- 50%
- 04-17
- 80%
- 04-08
- 90%
- 04-03
First fall freeze
- 10%
- 10-07
- 20%
- 10-13
- 50%
- 10-22
- 80%
- 10-29
- 90%
- 11-01
Growing season length (days, 28°F threshold)
- Short year
- 158
- Median
- 188
- Long year
- 212
Source NOAA station
WASHINGTON, IA US
3.4 mi · 30 yrs of record (1991–2020) · 687 ft elev.
Data from WASHINGTON, IA US, 3.4 miles away with 30-year NOAA record (1991-2020).
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