Helmville, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Helmville, a community in Powell County, Montana.
Tonight
22°F
Mostly Cloudy
Mostly cloudy, with a low around 22. Wind around 0 mph.
7-day forecast for Helmville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 22°F | Mostly Cloudy | 0 mph | 0% |
| Wednesday | 49°F | Mostly Sunny | 1 mph NNW | 0% |
| Wednesday Night | 21°F | Mostly Clear | 1 mph S | 0% |
| Thursday | 46°F | Mostly Sunny | 1 to 6 mph WSW | 1% |
| Thursday Night | 22°F | Partly Cloudy | 1 to 5 mph WSW | 1% |
| Friday | 49°F | Mostly Sunny | 1 to 6 mph WSW | 5% |
| Friday Night | 26°F | Mostly Cloudy | 2 to 8 mph WSW | 5% |
| Saturday | 55°F | Mostly Sunny | 2 mph WSW | 1% |
| Saturday Night | 28°F | Partly Cloudy | 3 mph S | 4% |
| Sunday | 58°F | Mostly Sunny | 3 to 10 mph SSW | 6% |
| Sunday Night | 28°F | Partly Cloudy | 0 to 9 mph W | 6% |
| Monday | 54°F | Partly Sunny | 0 mph | 7% |
| Monday Night | 28°F | Mostly Cloudy | 1 mph SW | 7% |
| Tuesday | 55°F | Partly Sunny | 1 to 5 mph WSW | 7% |
Forecast source: National Weather Service (api.weather.gov) for Helmville (46.856, -112.967). Updated through the day.
Growing snapshot for Helmville
Growing season
67 days
Hardiness zone
5a
More local growing data for Helmville: nearby ZIP 59843 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Ovando 9 Sse, Mt (2.8 mi from Helmville). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.