Mahaska County, Iowa · Frost dates
Mahaska County frost dates.
First-frost, last-frost, and growing-season length for Mahaska County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-04
- 20%
- 05-01
- 50%
- 04-21
- 80%
- 04-12
- 90%
- 04-08
First fall frost
- 10%
- 09-29
- 20%
- 10-05
- 50%
- 10-16
- 80%
- 10-25
- 90%
- 10-29
28°F — killing freeze
Last spring freeze
- 10%
- 04-26
- 20%
- 04-21
- 50%
- 04-11
- 80%
- 04-03
- 90%
- 03-29
First fall freeze
- 10%
- 10-10
- 20%
- 10-18
- 50%
- 10-27
- 80%
- 11-03
- 90%
- 11-08
Growing season length (days, 28°F threshold)
- Short year
- 167
- Median
- 199
- Long year
- 224
Source NOAA station
OSKALOOSA, IA US
0.8 mi · 30 yrs of record (1991–2020) · 830 ft elev.
Data from OSKALOOSA, IA US, 0.8 miles away with 30-year NOAA record (1991-2020).
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