Washtenaw County, Michigan · Frost dates
Washtenaw County frost dates.
First-frost, last-frost, and growing-season length for Washtenaw County, Michigan. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5b
32°F — light freeze
Last spring frost
- 10%
- 05-26
- 20%
- 05-22
- 50%
- 05-08
- 80%
- 04-28
- 90%
- 04-23
First fall frost
- 10%
- 09-20
- 20%
- 09-24
- 50%
- 10-04
- 80%
- 10-12
- 90%
- 10-17
28°F — killing freeze
Last spring freeze
- 10%
- 05-15
- 20%
- 05-10
- 50%
- 04-27
- 80%
- 04-17
- 90%
- 04-12
First fall freeze
- 10%
- 09-30
- 20%
- 10-05
- 50%
- 10-16
- 80%
- 10-26
- 90%
- 10-31
Growing season length (days, 28°F threshold)
- Short year
- 138
- Median
- 172
- Long year
- 202
Source NOAA station
ANN ARBOR MUNI AP, MI US
5.5 mi · 30 yrs of record (1991–2020) · 839 ft elev.
Data from ANN ARBOR MUNI AP, MI US, 5.5 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
14-day free trial. No credit card. Cancel anytime.