Mills County, Iowa · Frost dates
Mills County frost dates.
First-frost, last-frost, and growing-season length for Mills 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%
- 05-02
- 50%
- 04-23
- 80%
- 04-13
- 90%
- 04-09
First fall frost
- 10%
- 09-27
- 20%
- 10-01
- 50%
- 10-11
- 80%
- 10-20
- 90%
- 10-25
28°F — killing freeze
Last spring freeze
- 10%
- 04-27
- 20%
- 04-22
- 50%
- 04-12
- 80%
- 04-03
- 90%
- 03-29
First fall freeze
- 10%
- 10-03
- 20%
- 10-10
- 50%
- 10-21
- 80%
- 10-30
- 90%
- 11-03
Growing season length (days, 28°F threshold)
- Short year
- 159
- Median
- 192
- Long year
- 219
Source NOAA station
GLENWOOD 3SW, IA US
8.2 mi · 30 yrs of record (1991–2020) · 980 ft elev.
Data from GLENWOOD 3SW, IA US, 8.2 miles away with 30-year NOAA record (1991-2020).
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