Grass Lake, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grass Lake, a village in Jackson County, Michigan.
Today
66°F
Showers And Thunderstorms
Rain showers before 8am, then showers and thunderstorms between 8am and 5pm, then patchy fog and showers and thunderstorms likely. Cloudy. High near 66, with temperatures falling to around 64 in the afternoon. East southeast wind 3 to 8 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Grass Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 66°F | Showers And Thunderstorms | 3 to 8 mph ESE | 89% |
| Tonight | 59°F | Patchy Fog | 2 to 7 mph ESE | 94% |
| Sunday | 68°F | Rain Showers Likely then Mostly Cloudy | 3 to 10 mph N | 69% |
| Sunday Night | 50°F | Mostly Cloudy | 10 mph NE | 5% |
| Monday | 62°F | Mostly Cloudy | 12 mph NE | 7% |
| Monday Night | 46°F | Mostly Cloudy | 10 mph NE | 7% |
| Tuesday | 62°F | Partly Sunny | 14 mph NE | 10% |
| Tuesday Night | 48°F | Chance Rain Showers | 13 mph NE | 42% |
| Wednesday | 61°F | Chance Rain Showers | 13 mph ENE | 54% |
| Wednesday Night | 49°F | Chance Showers And Thunderstorms | 6 to 10 mph NE | 52% |
| Thursday | 64°F | Mostly Cloudy | 6 to 9 mph NE | 14% |
| Thursday Night | 49°F | Mostly Cloudy | 3 to 7 mph NE | 8% |
| Friday | 69°F | Mostly Sunny | 5 to 8 mph NNE | 7% |
| Friday Night | 48°F | Partly Cloudy | 2 to 7 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Grass Lake (42.251, -84.206). Updated through the day.
Growing snapshot for Grass Lake
Last spring frost
Apr 30
First fall frost
Oct 12
Growing season
163 days
Hardiness zone
6a
More local growing data for Grass Lake: nearby ZIP 49240 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Brooklyn
Cement City
Concord
Hanover
Jackson
Michigan Center
Napoleon
Parma
Spring Arbor
Springport
Vandercook Lake
Vineyard Lake
Climate data from the nearest NOAA station, Chelsea, Mi (9.3 mi from Grass Lake). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.