Grundy County, Iowa · Frost dates
Grundy County frost dates.
First-frost, last-frost, and growing-season length for Grundy 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%
- 05-07
- 50%
- 04-29
- 80%
- 04-19
- 90%
- 04-15
First fall frost
- 10%
- 09-25
- 20%
- 09-30
- 50%
- 10-09
- 80%
- 10-16
- 90%
- 10-20
28°F — killing freeze
Last spring freeze
- 10%
- 05-03
- 20%
- 04-29
- 50%
- 04-19
- 80%
- 04-09
- 90%
- 04-04
First fall freeze
- 10%
- 10-05
- 20%
- 10-11
- 50%
- 10-18
- 80%
- 10-26
- 90%
- 10-30
Growing season length (days, 28°F threshold)
- Short year
- 155
- Median
- 182
- Long year
- 209
Source NOAA station
GRUNDY CTR, IA US
3.1 mi · 30 yrs of record (1991–2020) · 985 ft elev.
Data from GRUNDY CTR, IA US, 3.1 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
14-day free trial. No credit card. Cancel anytime.