Grass Lake, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grass Lake, a village in Jackson County, Michigan.
Overnight
61°F
Slight Chance Rain Showers
A slight chance of rain showers after 5am. Mostly cloudy. Low around 61, with temperatures rising to around 63 overnight. South wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
7-day forecast for Grass Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 61°F | Slight Chance Rain Showers | 14 mph S | 16% |
| Wednesday | 68°F | Rain Showers | 12 to 17 mph S | 87% |
| Wednesday Night | 47°F | Chance Rain Showers then Mostly Cloudy | 10 mph SW | 51% |
| Thursday | 59°F | Mostly Cloudy | 9 to 15 mph SW | 11% |
| Thursday Night | 40°F | Chance Rain Showers | 5 to 8 mph W | 54% |
| Friday | 51°F | Chance Rain Showers | 7 to 10 mph NW | 54% |
| Friday Night | 31°F | Chance Rain Showers | 10 mph NW | 54% |
| Saturday | 50°F | Partly Sunny | 9 mph NW | 13% |
| Saturday Night | 29°F | Partly Cloudy | 5 mph WNW | 2% |
| Sunday | 55°F | Mostly Sunny | 6 to 12 mph W | 8% |
| Sunday Night | 30°F | Partly Cloudy | 5 to 9 mph W | 8% |
| Monday | 58°F | Sunny | 5 to 9 mph W | 2% |
| Monday Night | 36°F | Partly Cloudy | 8 mph WSW | 1% |
| Tuesday | 61°F | Mostly Sunny | 7 to 10 mph W | 1% |
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 Nov 4, 2026.