Howell, MI Weather & Growing Conditions
Live forecast is briefly unavailable; the local growing information below is from NOAA climate normals.
Growing snapshot for Howell, MI
Last spring frost
May 4
First fall frost
Oct 7
Growing season
156 days
Hardiness zone
6a
Explore more for Howell, MI: full frost dates · planting calendar · Michigan frost dates
Climate data from the nearest NOAA station, Howell Wwtp, Mi (1.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.