Harrison County, Iowa · Frost dates
Harrison County frost dates.
First-frost, last-frost, and growing-season length for Harrison County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-13
- 20%
- 05-07
- 50%
- 04-29
- 80%
- 04-20
- 90%
- 04-15
First fall frost
- 10%
- 09-23
- 20%
- 09-29
- 50%
- 10-08
- 80%
- 10-18
- 90%
- 10-22
28°F — killing freeze
Last spring freeze
- 10%
- 05-03
- 20%
- 04-29
- 50%
- 04-19
- 80%
- 04-10
- 90%
- 04-06
First fall freeze
- 10%
- 10-03
- 20%
- 10-10
- 50%
- 10-19
- 80%
- 10-28
- 90%
- 11-01
Growing season length (days, 28°F threshold)
- Short year
- 153
- Median
- 183
- Long year
- 209
Source NOAA station
LOGAN, IA US
4.0 mi · 30 yrs of record (1991–2020) · 990 ft elev.
Data from LOGAN, IA US, 4 miles away with 30-year NOAA record (1991-2020).
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