Union County, Ohio · Frost dates
Union County frost dates.
First-frost, last-frost, and growing-season length for Union County, Ohio. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-05
- 20%
- 04-29
- 50%
- 04-19
- 80%
- 04-10
- 90%
- 04-05
First fall frost
- 10%
- 10-13
- 20%
- 10-18
- 50%
- 10-26
- 80%
- 11-03
- 90%
- 11-07
28°F — killing freeze
Last spring freeze
- 10%
- 04-22
- 20%
- 04-18
- 50%
- 04-07
- 80%
- 03-29
- 90%
- 03-23
First fall freeze
- 10%
- 10-25
- 20%
- 10-31
- 50%
- 11-06
- 80%
- 11-15
- 90%
- 11-21
Growing season length (days, 28°F threshold)
- Short year
- 186
- Median
- 213
- Long year
- 243
Source NOAA station
MARYSVILLE, OH US
8.8 mi · 30 yrs of record (1991–2020) · 970 ft elev.
Data from MARYSVILLE, OH US, 8.8 miles away with 30-year NOAA record (1991-2020).
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