Osceola County, Iowa · Frost dates
Osceola County frost dates.
First-frost, last-frost, and growing-season length for Osceola County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-17
- 20%
- 05-13
- 50%
- 05-05
- 80%
- 04-27
- 90%
- 04-22
First fall frost
- 10%
- 09-21
- 20%
- 09-25
- 50%
- 10-03
- 80%
- 10-12
- 90%
- 10-17
28°F — killing freeze
Last spring freeze
- 10%
- 05-08
- 20%
- 05-04
- 50%
- 04-25
- 80%
- 04-15
- 90%
- 04-11
First fall freeze
- 10%
- 09-29
- 20%
- 10-02
- 50%
- 10-13
- 80%
- 10-22
- 90%
- 10-27
Growing season length (days, 28°F threshold)
- Short year
- 144
- Median
- 171
- Long year
- 199
Source NOAA station
SIBLEY, IA US
6.0 mi · 30 yrs of record (1991–2020) · 1529 ft elev.
Data from SIBLEY, IA US, 6 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
14-day free trial. No credit card. Cancel anytime.