Dubuque County, Iowa · Frost dates
Dubuque County frost dates.
First-frost, last-frost, and growing-season length for Dubuque 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%
- 04-28
- 80%
- 04-18
- 90%
- 04-13
First fall frost
- 10%
- 09-28
- 20%
- 10-02
- 50%
- 10-11
- 80%
- 10-19
- 90%
- 10-23
28°F — killing freeze
Last spring freeze
- 10%
- 05-03
- 20%
- 04-29
- 50%
- 04-17
- 80%
- 04-07
- 90%
- 04-02
First fall freeze
- 10%
- 10-08
- 20%
- 10-13
- 50%
- 10-21
- 80%
- 10-30
- 90%
- 11-02
Growing season length (days, 28°F threshold)
- Short year
- 158
- Median
- 187
- Long year
- 214
Source NOAA station
DUBUQUE RGNL AP, IA US
10.0 mi · 30 yrs of record (1991–2020) · 1056 ft elev.
Data from DUBUQUE RGNL AP, IA US, 10 miles away with 30-year NOAA record (1991-2020).
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