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Frost dates and growing zones in Michigan

9 town pages so far. Zones from the 2023 USDA Plant Hardiness Zone Map, frost dates from NOAA 1991-2020 normals at the nearest weather station.

Towns covered so far in Michigan fall in USDA zones 6a, 6b. Median dates mean frost comes later (spring) or earlier (fall) in half of years.

Towns

Town	Zone	Median last frost	Median first frost
Detroit	6b	Apr 21	Oct 31
Grand Rapids	6a	Apr 29	Oct 20
Ann Arbor	6a	May 3	Oct 13
Lansing	6a	May 1	Oct 13
Flint	6a	May 6	Oct 10
Saginaw	6a	Apr 29	Oct 21
Muskegon	6b	Apr 30	Oct 19
Holland	6b	Apr 28	Oct 21
Jackson	6a	May 1	Oct 14