Plymouth County, Iowa · Frost dates
Plymouth County frost dates.
First-frost, last-frost, and growing-season length for Plymouth County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-12
- 20%
- 05-08
- 50%
- 04-30
- 80%
- 04-21
- 90%
- 04-17
First fall frost
- 10%
- 09-21
- 20%
- 09-25
- 50%
- 10-04
- 80%
- 10-15
- 90%
- 10-19
28°F — killing freeze
Last spring freeze
- 10%
- 05-02
- 20%
- 04-29
- 50%
- 04-20
- 80%
- 04-10
- 90%
- 04-05
First fall freeze
- 10%
- 09-29
- 20%
- 10-04
- 50%
- 10-16
- 80%
- 10-25
- 90%
- 10-30
Growing season length (days, 28°F threshold)
- Short year
- 150
- Median
- 179
- Long year
- 208
Source NOAA station
LE MARS, IA US
4.7 mi · 30 yrs of record (1991–2020) · 1195 ft elev.
Data from LE MARS, IA US, 4.7 miles away with 30-year NOAA record (1991-2020).
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