Grand Blanc, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Blanc, a city in Genesee County, Michigan.
This Afternoon
74°F
Mostly Sunny
Mostly sunny. High near 74, with temperatures falling to around 72 in the afternoon. South southwest wind around 14 mph, with gusts as high as 24 mph.
7-day forecast for Grand Blanc
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Mostly Sunny | 14 mph SSW | 2% |
| Tonight | 62°F | Partly Cloudy | 12 mph S | 4% |
| Wednesday | 69°F | Light Rain | 13 to 16 mph S | 88% |
| Wednesday Night | 50°F | Light Rain then Mostly Cloudy | 8 to 13 mph SSW | 83% |
| Thursday | 60°F | Mostly Cloudy then Slight Chance Light Rain | 9 to 14 mph SW | 22% |
| Thursday Night | 45°F | Chance Light Rain | 3 to 8 mph W | 42% |
| Friday | 53°F | Chance Light Rain | 3 to 9 mph NW | 53% |
| Friday Night | 37°F | Chance Light Rain | 6 to 9 mph NNW | 50% |
| Saturday | 51°F | Chance Light Rain then Partly Sunny | 9 mph NW | 26% |
| Saturday Night | 32°F | Partly Cloudy | 5 mph W | 5% |
| Sunday | 56°F | Mostly Sunny then Slight Chance Light Rain | 5 to 10 mph WSW | 15% |
| Sunday Night | 34°F | Slight Chance Light Rain then Partly Cloudy | 6 to 9 mph WNW | 15% |
| Monday | 57°F | Mostly Sunny | 6 to 12 mph W | 11% |
| Monday Night | 38°F | Partly Cloudy | 9 mph WSW | 10% |
Forecast source: National Weather Service (api.weather.gov) for Grand Blanc (42.933, -83.620). Updated through the day.
Growing snapshot for Grand Blanc
Last spring frost
May 1
First fall frost
Oct 14
Growing season
164 days
Hardiness zone
6a
More local growing data for Grand Blanc: nearby ZIP 48439 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Argentine
Beecher
Burton
Clio
Davison
Flint
Flushing
Gaines
Goodrich
Linden
Montrose
Mount Morris
Otisville
Swartz Creek
Climate data from the nearest NOAA station, Goodrich, Mi (6.2 mi from Grand Blanc). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.