Pinnacle, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Pinnacle, a community in Flathead County, Montana.
Overnight
49°F
Mostly Cloudy
Mostly cloudy, with a low around 49. East southeast wind around 1 mph.
7-day forecast for Pinnacle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Mostly Cloudy | 1 mph ESE | 0% |
| Saturday | 73°F | Sunny | 1 mph SE | 1% |
| Saturday Night | 48°F | Partly Cloudy | 1 mph SE | 1% |
| Sunday | 73°F | Sunny | 2 mph SW | 0% |
| Sunday Night | 48°F | Clear | 1 mph SW | 0% |
| Monday | 74°F | Sunny | 0 to 3 mph SW | 0% |
| Monday Night | 50°F | Mostly Clear | 2 mph SSW | 0% |
| Tuesday | 73°F | Sunny | 2 mph SW | 0% |
| Tuesday Night | 50°F | Partly Cloudy | 2 mph SE | 0% |
| Wednesday | 72°F | Mostly Sunny | 5 mph S | 0% |
| Wednesday Night | 50°F | Partly Cloudy | 2 mph S | 2% |
| Thursday | 72°F | Mostly Sunny | 2 mph SSW | 1% |
| Thursday Night | 50°F | Partly Cloudy | 2 mph SE | 8% |
| Friday | 70°F | Partly Sunny then Slight Chance Light Rain | 2 mph SSE | 15% |
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 Sep 19, 2026.