Greene County, Iowa · Frost dates

Greene County frost dates.

First-frost, last-frost, and growing-season length for Greene County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.

Data confidence: high · USDA zone: 5a

32°F — light freeze

Last spring frost

10%
05-08
20%
05-04
50%
04-26
80%
04-17
90%
04-12

First fall frost

10%
09-23
20%
09-28
50%
10-09
80%
10-19
90%
10-24

28°F — killing freeze

Last spring freeze

10%
04-29
20%
04-24
50%
04-15
80%
04-06
90%
04-01

First fall freeze

10%
10-03
20%
10-11
50%
10-21
80%
10-29
90%
11-02

Growing season length (days, 28°F threshold)

Short year
157
Median
189
Long year
215

Source NOAA station

JEFFERSON, IA US

2.3 mi · 30 yrs of record (19912020) · 1055 ft elev.

Data from JEFFERSON, IA US, 2.3 miles away with 30-year NOAA record (1991-2020).

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