Harman US

Pinnacle, MT Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Pinnacle, a community in Flathead County, Montana.

This Afternoon
73°F
Mostly Sunny
Mostly sunny, with a high near 73. East wind around 1 mph.

7-day forecast for Pinnacle

WhenTempForecastWindPrecip
This Afternoon 73°F Mostly Sunny 1 mph E 3%
Tonight 48°F Partly Cloudy 1 mph ESE 1%
Sunday 73°F Sunny 2 mph S 0%
Sunday Night 48°F Mostly Clear 0 mph 0%
Monday 74°F Sunny 0 to 3 mph SW 0%
Monday Night 50°F Mostly Clear 2 mph SSW 0%
Tuesday 74°F Sunny 0 to 3 mph SW 0%
Tuesday Night 51°F Partly Cloudy 2 mph SSE 0%
Wednesday 71°F Mostly Sunny 1 to 5 mph SSW 1%
Wednesday Night 49°F Partly Cloudy 3 mph SW 5%
Thursday 69°F Mostly Sunny 3 mph SSW 3%
Thursday Night 50°F Partly Cloudy 2 mph S 13%
Friday 68°F Partly Sunny 2 mph SSE 13%
Friday Night 47°F Chance Light Rain 3 mph SSE 25%

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 20, 2026.