Shelby County, Iowa · Frost dates
Shelby County frost dates.
First-frost, last-frost, and growing-season length for Shelby County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-09
- 20%
- 05-05
- 50%
- 04-27
- 80%
- 04-17
- 90%
- 04-12
First fall frost
- 10%
- 09-24
- 20%
- 09-29
- 50%
- 10-09
- 80%
- 10-18
- 90%
- 10-22
28°F — killing freeze
Last spring freeze
- 10%
- 04-30
- 20%
- 04-26
- 50%
- 04-17
- 80%
- 04-07
- 90%
- 04-03
First fall freeze
- 10%
- 10-04
- 20%
- 10-10
- 50%
- 10-20
- 80%
- 10-28
- 90%
- 11-01
Growing season length (days, 28°F threshold)
- Short year
- 157
- Median
- 186
- Long year
- 212
Source NOAA station
HARLAN, IA US
2.7 mi · 30 yrs of record (1991–2020) · 1270 ft elev.
Data from HARLAN, IA US, 2.7 miles away with 30-year NOAA record (1991-2020).
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