Sioux County, Iowa · Frost dates
Sioux County frost dates.
First-frost, last-frost, and growing-season length for Sioux 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%
- 04-22
- 90%
- 04-17
First fall frost
- 10%
- 09-19
- 20%
- 09-24
- 50%
- 10-03
- 80%
- 10-13
- 90%
- 10-18
28°F — killing freeze
Last spring freeze
- 10%
- 05-04
- 20%
- 04-30
- 50%
- 04-21
- 80%
- 04-11
- 90%
- 04-07
First fall freeze
- 10%
- 09-29
- 20%
- 10-03
- 50%
- 10-14
- 80%
- 10-23
- 90%
- 10-27
Growing season length (days, 28°F threshold)
- Short year
- 148
- Median
- 176
- Long year
- 203
Source NOAA station
SIOUX CTR 2 SE, IA US
2.3 mi · 30 yrs of record (1991–2020) · 1360 ft elev.
Data from SIOUX CTR 2 SE, IA US, 2.3 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
14-day free trial. No credit card. Cancel anytime.