Ontonagon County, Michigan · Frost dates
Ontonagon County frost dates.
First-frost, last-frost, and growing-season length for Ontonagon County, Michigan. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 06-13
- 20%
- 06-06
- 50%
- 05-27
- 80%
- 05-15
- 90%
- 05-07
First fall frost
- 10%
- 09-14
- 20%
- 09-21
- 50%
- 10-01
- 80%
- 10-10
- 90%
- 10-16
28°F — killing freeze
Last spring freeze
- 10%
- 05-29
- 20%
- 05-22
- 50%
- 05-10
- 80%
- 04-29
- 90%
- 04-25
First fall freeze
- 10%
- 09-28
- 20%
- 10-03
- 50%
- 10-14
- 80%
- 10-27
- 90%
- 11-01
Growing season length (days, 28°F threshold)
- Short year
- 122
- Median
- 157
- Long year
- 190
Source NOAA station
ONTONAGON 6 SE, MI US
3.3 mi · 30 yrs of record (1991–2020) · 790 ft elev.
Data from ONTONAGON 6 SE, MI US, 3.3 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
14-day free trial. No credit card. Cancel anytime.