Calhoun County, Iowa · Frost dates
Calhoun County frost dates.
First-frost, last-frost, and growing-season length for Calhoun County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-06
- 20%
- 05-03
- 50%
- 04-26
- 80%
- 04-17
- 90%
- 04-11
First fall frost
- 10%
- 09-27
- 20%
- 10-01
- 50%
- 10-10
- 80%
- 10-19
- 90%
- 10-24
28°F — killing freeze
Last spring freeze
- 10%
- 04-29
- 20%
- 04-25
- 50%
- 04-16
- 80%
- 04-07
- 90%
- 04-02
First fall freeze
- 10%
- 10-06
- 20%
- 10-11
- 50%
- 10-21
- 80%
- 10-31
- 90%
- 11-04
Growing season length (days, 28°F threshold)
- Short year
- 160
- Median
- 188
- Long year
- 216
Source NOAA station
ROCKWELL CITY, IA US
1.0 mi · 30 yrs of record (1991–2020) · 1214 ft elev.
Data from ROCKWELL CITY, IA US, 1 miles away with 30-year NOAA record (1991-2020).
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