Marion County, Iowa · Frost dates
Marion County frost dates.
First-frost, last-frost, and growing-season length for Marion 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%
- 04-30
- 50%
- 04-20
- 80%
- 04-10
- 90%
- 04-06
First fall frost
- 10%
- 10-01
- 20%
- 10-08
- 50%
- 10-19
- 80%
- 10-27
- 90%
- 11-01
28°F — killing freeze
Last spring freeze
- 10%
- 04-24
- 20%
- 04-19
- 50%
- 04-10
- 80%
- 04-02
- 90%
- 03-28
First fall freeze
- 10%
- 10-14
- 20%
- 10-20
- 50%
- 10-29
- 80%
- 11-05
- 90%
- 11-09
Growing season length (days, 28°F threshold)
- Short year
- 173
- Median
- 202
- Long year
- 226
Source NOAA station
KNOXVILLE, IA US
0.6 mi · 30 yrs of record (1991–2020) · 895 ft elev.
Data from KNOXVILLE, IA US, 0.6 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
14-day free trial. No credit card. Cancel anytime.