Hamilton County, Iowa · Frost dates
Hamilton County frost dates.
First-frost, last-frost, and growing-season length for Hamilton County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-16
- 20%
- 05-11
- 50%
- 05-03
- 80%
- 04-25
- 90%
- 04-20
First fall frost
- 10%
- 09-18
- 20%
- 09-23
- 50%
- 10-02
- 80%
- 10-11
- 90%
- 10-16
28°F — killing freeze
Last spring freeze
- 10%
- 05-07
- 20%
- 05-02
- 50%
- 04-24
- 80%
- 04-15
- 90%
- 04-10
First fall freeze
- 10%
- 09-27
- 20%
- 10-02
- 50%
- 10-12
- 80%
- 10-21
- 90%
- 10-25
Growing season length (days, 28°F threshold)
- Short year
- 143
- Median
- 171
- Long year
- 198
Source NOAA station
WEBSTER CITY, IA US
7.0 mi · 30 yrs of record (1991–2020) · 1072 ft elev.
Data from WEBSTER CITY, IA US, 7 miles away with 30-year NOAA record (1991-2020).
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