Linn County, Iowa · Frost dates
Linn County frost dates.
First-frost, last-frost, and growing-season length for Linn 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%
- 05-08
- 50%
- 04-28
- 80%
- 04-18
- 90%
- 04-14
First fall frost
- 10%
- 09-29
- 20%
- 10-03
- 50%
- 10-12
- 80%
- 10-20
- 90%
- 10-25
28°F — killing freeze
Last spring freeze
- 10%
- 05-02
- 20%
- 04-28
- 50%
- 04-17
- 80%
- 04-08
- 90%
- 04-04
First fall freeze
- 10%
- 10-08
- 20%
- 10-14
- 50%
- 10-22
- 80%
- 10-29
- 90%
- 11-01
Growing season length (days, 28°F threshold)
- Short year
- 159
- Median
- 188
- Long year
- 211
Source NOAA station
CEDAR RAPIDS #1, IA US
2.0 mi · 30 yrs of record (1991–2020) · 813 ft elev.
Data from CEDAR RAPIDS #1, IA US, 2 miles away with 30-year NOAA record (1991-2020).
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