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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

WhenTempForecastWindPrecip
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.