Forsyth, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Forsyth, a city in Rosebud County, Montana.
Overnight
45°F
Mostly Clear
Mostly clear. Low around 45, with temperatures rising to around 47 overnight. Southwest wind around 2 mph.
7-day forecast for Forsyth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 45°F | Mostly Clear | 2 mph SW | 0% |
| Tuesday | 78°F | Sunny | 2 to 8 mph WNW | 0% |
| Tuesday Night | 51°F | Partly Cloudy | 2 to 7 mph E | 1% |
| Wednesday | 88°F | Sunny | 1 to 5 mph W | 0% |
| Wednesday Night | 55°F | Mostly Clear | 5 mph S | 0% |
| Thursday | 96°F | Sunny | 1 to 6 mph W | 0% |
| Thursday Night | 60°F | Mostly Clear | 2 to 6 mph NNE | 0% |
| Friday | 100°F | Sunny | 2 to 6 mph SE | 0% |
| Friday Night | 63°F | Mostly Clear | 5 to 9 mph NE | 0% |
| Saturday | 97°F | Sunny | 5 to 10 mph NNW | 0% |
| Saturday Night | 64°F | Partly Cloudy | 8 mph ENE | 1% |
| Sunday | 96°F | Mostly Sunny | 5 to 10 mph NE | 0% |
| Sunday Night | 64°F | Partly Cloudy | 9 mph NE | 10% |
| Monday | 93°F | Mostly Sunny | 6 to 10 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Forsyth (46.268, -106.673). Updated through the day.
Growing snapshot for Forsyth
Last spring frost
May 9
First fall frost
Sep 29
Growing season
142 days
Hardiness zone
4b
More local growing data for Forsyth: nearby ZIP 59327 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Forsyth, Mt (2.5 mi from Forsyth). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.