Helena Flats, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Helena Flats, a community in Flathead County, Montana.
Overnight
47°F
Mostly Cloudy
Mostly cloudy, with a low around 47. North wind around 2 mph.
7-day forecast for Helena Flats
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 47°F | Mostly Cloudy | 2 mph N | 1% |
| Saturday | 73°F | Sunny | 3 mph ESE | 1% |
| Saturday Night | 47°F | Partly Cloudy | 1 mph SE | 1% |
| Sunday | 73°F | Patchy Fog then Sunny | 0 to 3 mph SSE | 0% |
| Sunday Night | 46°F | Mostly Clear | 2 mph E | 0% |
| Monday | 74°F | Sunny | 1 to 6 mph ESE | 0% |
| Monday Night | 48°F | Mostly Clear | 0 to 3 mph SSE | 0% |
| Tuesday | 74°F | Sunny | 0 to 3 mph ESE | 0% |
| Tuesday Night | 48°F | Partly Cloudy | 2 mph ENE | 0% |
| Wednesday | 73°F | Mostly Sunny | 0 to 6 mph SE | 0% |
| Wednesday Night | 48°F | Partly Cloudy | 2 mph SSW | 2% |
| Thursday | 71°F | Mostly Sunny | 2 mph S | 1% |
| Thursday Night | 47°F | Partly Cloudy | 1 mph NE | 8% |
| Friday | 69°F | Partly Sunny | 3 mph E | 11% |
Forecast source: National Weather Service (api.weather.gov) for Helena Flats (48.279, -114.236). Updated through the day.
Growing snapshot for Helena Flats
Last spring frost
May 16
First fall frost
Sep 25
Growing season
129 days
Hardiness zone
5a
More local growing data for Helena Flats: nearby ZIP 59912 weather · frost dates · planting calendar · Montana frost dates
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Climate data from the nearest NOAA station, Whitefish, Mt (9 mi from Helena Flats). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.