Madison County, Iowa · Frost dates
Madison County frost dates.
First-frost, last-frost, and growing-season length for Madison County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-11
- 20%
- 05-07
- 50%
- 04-30
- 80%
- 04-21
- 90%
- 04-17
First fall frost
- 10%
- 09-20
- 20%
- 09-25
- 50%
- 10-03
- 80%
- 10-14
- 90%
- 10-20
28°F — killing freeze
Last spring freeze
- 10%
- 05-03
- 20%
- 04-30
- 50%
- 04-20
- 80%
- 04-11
- 90%
- 04-06
First fall freeze
- 10%
- 09-29
- 20%
- 10-03
- 50%
- 10-15
- 80%
- 10-25
- 90%
- 10-28
Growing season length (days, 28°F threshold)
- Short year
- 149
- Median
- 178
- Long year
- 205
Source NOAA station
WINTERSET 1S, IA US
1.1 mi · 30 yrs of record (1991–2020) · 1100 ft elev.
Data from WINTERSET 1S, IA US, 1.1 miles away with 30-year NOAA record (1991-2020).
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