Grand Blanc, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Blanc, a city in Genesee County, Michigan.
Overnight
53°F
Chance Light Rain
A chance of rain. Mostly cloudy. Low around 53, with temperatures rising to around 55 overnight. East northeast wind around 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Grand Blanc
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Chance Light Rain | 5 mph ENE | 35% |
| Saturday | 65°F | Rain Showers | 3 to 8 mph ESE | 79% |
| Saturday Night | 55°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 8 mph E | 81% |
| Sunday | 66°F | Chance Rain Showers | 7 to 12 mph NE | 42% |
| Sunday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 7 to 10 mph NE | 36% |
| Monday | 62°F | Mostly Cloudy | 9 to 13 mph NE | 7% |
| Monday Night | 47°F | Mostly Cloudy | 8 to 12 mph NE | 7% |
| Tuesday | 62°F | Partly Sunny | 10 to 14 mph NE | 13% |
| Tuesday Night | 49°F | Chance Rain Showers | 12 mph ENE | 43% |
| Wednesday | 62°F | Chance Rain Showers | 12 mph ENE | 43% |
| Wednesday Night | 50°F | Chance Rain Showers | 6 to 10 mph NE | 38% |
| Thursday | 65°F | Partly Sunny then Slight Chance Rain Showers | 6 to 9 mph NE | 15% |
| Thursday Night | 50°F | Slight Chance Rain Showers then Mostly Cloudy | 3 to 7 mph NNE | 15% |
| Friday | 68°F | Mostly Sunny | 3 to 8 mph NNE | 7% |
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 Sep 19, 2026.