Benton County, Iowa · Frost dates
Benton County frost dates.
First-frost, last-frost, and growing-season length for Benton County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-17
- 20%
- 05-12
- 50%
- 05-03
- 80%
- 04-26
- 90%
- 04-21
First fall frost
- 10%
- 09-20
- 20%
- 09-25
- 50%
- 10-03
- 80%
- 10-11
- 90%
- 10-15
28°F — killing freeze
Last spring freeze
- 10%
- 05-08
- 20%
- 05-04
- 50%
- 04-25
- 80%
- 04-15
- 90%
- 04-10
First fall freeze
- 10%
- 09-29
- 20%
- 10-03
- 50%
- 10-12
- 80%
- 10-21
- 90%
- 10-24
Growing season length (days, 28°F threshold)
- Short year
- 144
- Median
- 170
- Long year
- 197
Source NOAA station
VINTON, IA US
5.9 mi · 30 yrs of record (1991–2020) · 850 ft elev.
Data from VINTON, IA US, 5.9 miles away with 30-year NOAA record (1991-2020).
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