Black Hawk County, Iowa · Frost dates
Black Hawk County frost dates.
First-frost, last-frost, and growing-season length for Black Hawk County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-10
- 20%
- 05-05
- 50%
- 04-27
- 80%
- 04-16
- 90%
- 04-11
First fall frost
- 10%
- 09-26
- 20%
- 10-01
- 50%
- 10-10
- 80%
- 10-18
- 90%
- 10-21
28°F — killing freeze
Last spring freeze
- 10%
- 05-02
- 20%
- 04-27
- 50%
- 04-16
- 80%
- 04-07
- 90%
- 04-03
First fall freeze
- 10%
- 10-06
- 20%
- 10-11
- 50%
- 10-20
- 80%
- 10-27
- 90%
- 10-31
Growing season length (days, 28°F threshold)
- Short year
- 157
- Median
- 187
- Long year
- 211
Source NOAA station
WATERLOO MUNI AP, IA US
7.5 mi · 30 yrs of record (1991–2020) · 868 ft elev.
Data from WATERLOO MUNI AP, IA US, 7.5 miles away with 30-year NOAA record (1991-2020).
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