Winnett, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winnett, a town in Petroleum County, Montana.
Tonight
53°F
Cloudy then Showers And Thunderstorms Likely
Showers and thunderstorms likely after midnight. Cloudy, with a low around 53. North wind around 9 mph. Chance of precipitation is 70%.
7-day forecast for Winnett
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Cloudy then Showers And Thunderstorms Likely | 9 mph N | 67% |
| Saturday | 62°F | Showers And Thunderstorms | 12 mph NNE | 92% |
| Saturday Night | 51°F | Showers And Thunderstorms | 8 mph NNE | 83% |
| Sunday | 63°F | Rain Showers | 8 mph NNE | 77% |
| Sunday Night | 49°F | Mostly Cloudy | 3 to 8 mph ESE | 11% |
| Monday | 73°F | Mostly Sunny | 5 to 13 mph SSE | 0% |
| Monday Night | 49°F | Mostly Clear | 5 to 10 mph SSE | 0% |
| Tuesday | 79°F | Mostly Sunny | 5 mph SSW | 0% |
| Tuesday Night | 51°F | Partly Cloudy | 5 mph SSE | 2% |
| Wednesday | 80°F | Sunny | 2 to 7 mph SSW | 5% |
| Wednesday Night | 51°F | Mostly Clear | 5 mph SSE | 2% |
| Thursday | 80°F | Sunny | 3 to 9 mph S | 2% |
| Thursday Night | 51°F | Partly Cloudy | 7 mph S | 3% |
| Friday | 81°F | Mostly Sunny | 5 to 10 mph S | 1% |
Forecast source: National Weather Service (api.weather.gov) for Winnett (47.004, -108.347). Updated through the day.
Growing snapshot for Winnett
Last spring frost
May 18
First fall frost
Sep 21
Growing season
124 days
Hardiness zone
4b
More local growing data for Winnett: nearby ZIP 59087 weather · frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Valentine, Mt (18.7 mi from Winnett). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.