Pinnacle, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Pinnacle, a community in Flathead County, Montana.
Overnight
39°F
Mostly Clear
Mostly clear, with a low around 39. Southeast wind around 1 mph.
7-day forecast for Pinnacle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 39°F | Mostly Clear | 1 mph SE | 0% |
| Tuesday | 74°F | Sunny | 0 to 3 mph SW | 1% |
| Tuesday Night | 49°F | Mostly Clear | 2 mph SSE | 0% |
| Wednesday | 79°F | Sunny | 0 to 5 mph WSW | 0% |
| Wednesday Night | 52°F | Clear | 0 to 3 mph SW | 0% |
| Thursday | 86°F | Sunny | 0 to 5 mph SW | 0% |
| Thursday Night | 55°F | Clear | 0 to 5 mph S | 0% |
| Friday | 88°F | Sunny | 0 to 5 mph SW | 0% |
| Friday Night | 56°F | Clear | 2 to 10 mph SSW | 0% |
| Saturday | 85°F | Sunny | 2 to 8 mph SSW | 0% |
| Saturday Night | 55°F | Mostly Clear | 1 to 7 mph S | 0% |
| Sunday | 82°F | Sunny | 3 mph S | 0% |
| Sunday Night | 54°F | Mostly Clear | 3 mph SSE | 0% |
| Monday | 81°F | Sunny | 3 mph SSW | 5% |
Forecast source: National Weather Service (api.weather.gov) for Pinnacle (48.358, -113.649). Updated through the day.
Growing snapshot for Pinnacle
Last spring frost
May 9
First fall frost
Oct 1
Growing season
141 days
Hardiness zone
5a
More local growing data for Pinnacle: nearby ZIP 59916 weather · frost dates · planting calendar · Montana frost dates
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Climate data from the nearest NOAA station, Hungry Horse Dam, Mt (16.9 mi from Pinnacle). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.