Clayton County, Iowa · Frost dates
Clayton County frost dates.
First-frost, last-frost, and growing-season length for Clayton County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-22
- 20%
- 05-17
- 50%
- 05-08
- 80%
- 04-29
- 90%
- 04-24
First fall frost
- 10%
- 09-18
- 20%
- 09-22
- 50%
- 10-01
- 80%
- 10-10
- 90%
- 10-14
28°F — killing freeze
Last spring freeze
- 10%
- 05-13
- 20%
- 05-08
- 50%
- 04-27
- 80%
- 04-17
- 90%
- 04-13
First fall freeze
- 10%
- 09-26
- 20%
- 10-01
- 50%
- 10-11
- 80%
- 10-19
- 90%
- 10-24
Growing season length (days, 28°F threshold)
- Short year
- 136
- Median
- 167
- Long year
- 194
Source NOAA station
ELKADER 6 SSW, IA US
8.0 mi · 30 yrs of record (1991–2020) · 788 ft elev.
Data from ELKADER 6 SSW, IA US, 8 miles away with 30-year NOAA record (1991-2020).
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