Delaware County, Iowa · Frost dates
Delaware County frost dates.
First-frost, last-frost, and growing-season length for Delaware County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-16
- 20%
- 05-12
- 50%
- 05-03
- 80%
- 04-24
- 90%
- 04-18
First fall frost
- 10%
- 09-22
- 20%
- 09-26
- 50%
- 10-04
- 80%
- 10-12
- 90%
- 10-17
28°F — killing freeze
Last spring freeze
- 10%
- 05-07
- 20%
- 05-03
- 50%
- 04-23
- 80%
- 04-12
- 90%
- 04-07
First fall freeze
- 10%
- 10-02
- 20%
- 10-06
- 50%
- 10-15
- 80%
- 10-24
- 90%
- 10-28
Growing season length (days, 28°F threshold)
- Short year
- 148
- Median
- 175
- Long year
- 204
Source NOAA station
MANCHESTER #2, IA US
4.3 mi · 30 yrs of record (1991–2020) · 990 ft elev.
Data from MANCHESTER #2, IA US, 4.3 miles away with 30-year NOAA record (1991-2020).
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