Cass County, Iowa · Frost dates
Cass County frost dates.
First-frost, last-frost, and growing-season length for Cass County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-15
- 20%
- 05-09
- 50%
- 04-30
- 80%
- 04-22
- 90%
- 04-17
First fall frost
- 10%
- 09-17
- 20%
- 09-23
- 50%
- 10-02
- 80%
- 10-11
- 90%
- 10-16
28°F — killing freeze
Last spring freeze
- 10%
- 05-05
- 20%
- 04-30
- 50%
- 04-22
- 80%
- 04-13
- 90%
- 04-08
First fall freeze
- 10%
- 09-27
- 20%
- 10-01
- 50%
- 10-12
- 80%
- 10-22
- 90%
- 10-27
Growing season length (days, 28°F threshold)
- Short year
- 145
- Median
- 173
- Long year
- 202
Source NOAA station
ATLANTIC 1 NE, IA US
6.9 mi · 30 yrs of record (1991–2020) · 1152 ft elev.
Data from ATLANTIC 1 NE, IA US, 6.9 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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