Ottawa County, Michigan · Frost dates
Ottawa County frost dates.
First-frost, last-frost, and growing-season length for Ottawa County, Michigan. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 05-16
- 20%
- 05-12
- 50%
- 04-30
- 80%
- 04-20
- 90%
- 04-17
First fall frost
- 10%
- 10-05
- 20%
- 10-11
- 50%
- 10-24
- 80%
- 11-01
- 90%
- 11-06
28°F — killing freeze
Last spring freeze
- 10%
- 05-06
- 20%
- 04-30
- 50%
- 04-18
- 80%
- 04-08
- 90%
- 04-04
First fall freeze
- 10%
- 10-21
- 20%
- 10-27
- 50%
- 11-05
- 80%
- 11-16
- 90%
- 11-22
Growing season length (days, 28°F threshold)
- Short year
- 168
- Median
- 201
- Long year
- 232
Source NOAA station
GRAND HAVEN WWTP, MI US
0.8 mi · 30 yrs of record (1991–2020) · 605 ft elev.
Data from GRAND HAVEN WWTP, MI US, 0.8 miles away with 30-year NOAA record (1991-2020).
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