Forsyth, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Forsyth, a city in Rosebud County, Montana.
This Afternoon
51°F
Sunny
Sunny. High near 51, with temperatures falling to around 45 in the afternoon. Southwest wind around 5 mph.
7-day forecast for Forsyth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 51°F | Sunny | 5 mph SW | 0% |
| Tonight | 29°F | Patchy Fog | 5 mph SSE | 0% |
| Wednesday | 50°F | Patchy Fog then Mostly Sunny | 5 mph NW | 0% |
| Wednesday Night | 30°F | Patchy Fog | 2 mph SW | 0% |
| Thursday | 54°F | Patchy Fog then Mostly Sunny | 3 mph SSW | 0% |
| Thursday Night | 33°F | Partly Cloudy then Patchy Fog | 0 to 3 mph NNW | 1% |
| Friday | 55°F | Patchy Fog then Sunny | 3 to 8 mph WSW | 6% |
| Friday Night | 37°F | Partly Cloudy | 5 to 9 mph WSW | 7% |
| Saturday | 58°F | Sunny | 2 to 13 mph WSW | 2% |
| Saturday Night | 35°F | Mostly Clear | 3 mph SSW | 0% |
| Sunday | 65°F | Mostly Sunny | 2 to 7 mph SW | 0% |
| Sunday Night | 40°F | Partly Cloudy | 6 mph W | 0% |
| Monday | 58°F | Mostly Sunny | 6 mph WNW | 1% |
| Monday Night | 36°F | Partly Cloudy | 3 mph SSE | 1% |
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 Nov 3, 2026.