Grantsburg, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grantsburg, a village in Burnett County, Wisconsin.
Overnight
51°F
Light Rain
Rain and patchy fog. Cloudy, with a low around 51. Northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Grantsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 51°F | Light Rain | 5 to 10 mph NE | 79% |
| Wednesday | 56°F | Light Rain | 5 mph N | 84% |
| Wednesday Night | 41°F | Light Rain | 10 to 15 mph N | 86% |
| Thursday | 47°F | Slight Chance Light Rain then Mostly Cloudy | 10 to 15 mph N | 15% |
| Thursday Night | 28°F | Mostly Cloudy | 0 to 5 mph N | 1% |
| Friday | 45°F | Mostly Sunny | 0 to 5 mph N | 0% |
| Friday Night | 24°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 47°F | Mostly Sunny | 0 to 5 mph SW | 3% |
| Saturday Night | 31°F | Partly Cloudy | 0 to 5 mph SW | 6% |
| Sunday | 52°F | Sunny | 0 to 5 mph W | 4% |
| Sunday Night | 31°F | Partly Cloudy | 0 to 5 mph SW | 0% |
| Monday | 56°F | Mostly Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 34°F | Partly Cloudy | 0 to 5 mph W | 1% |
| Tuesday | 53°F | Mostly Sunny | 0 to 5 mph NW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Grantsburg (45.784, -92.677). Updated through the day.
Growing snapshot for Grantsburg
Last spring frost
May 11
First fall frost
Oct 1
Growing season
141 days
Hardiness zone
4a
More local growing data for Grantsburg: nearby ZIP 54840 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Grantsburg, Wi (1.5 mi from Grantsburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.