Harman US

Big Sandy, MT Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Big Sandy, a town in Hill County, Montana.

Today
72°F
Mostly Cloudy
Mostly cloudy, with a high near 72. Northeast wind around 5 mph.

7-day forecast for Big Sandy

WhenTempForecastWindPrecip
Today 72°F Mostly Cloudy 5 mph NE 1%
Tonight 48°F Mostly Cloudy 2 to 6 mph ESE 4%
Sunday 73°F Patchy Fog then Mostly Sunny 2 to 6 mph SE 1%
Sunday Night 49°F Mostly Clear 7 to 12 mph SE 0%
Monday 77°F Sunny 5 to 8 mph SSE 0%
Monday Night 50°F Mostly Clear 3 to 12 mph SSE 0%
Tuesday 79°F Sunny 5 mph SW 0%
Tuesday Night 50°F Mostly Clear 3 mph ESE 0%
Wednesday 80°F Sunny 1 to 5 mph SSW 1%
Wednesday Night 52°F Mostly Clear 1 to 6 mph SSE 3%
Thursday 81°F Sunny 3 mph SSW 2%
Thursday Night 53°F Partly Cloudy 5 to 8 mph SE 9%
Friday 78°F Mostly Sunny 6 mph S 5%
Friday Night 48°F Slight Chance Light Rain 7 mph NNE 19%

Forecast source: National Weather Service (api.weather.gov) for Big Sandy (48.179, -110.113). Updated through the day.

Growing snapshot for Big Sandy

Last spring frost
May 17
First fall frost
Sep 25
Growing season
128 days
Hardiness zone
4a

More local growing data for Big Sandy: nearby ZIP 59521 weather · frost dates · planting calendar · Montana frost dates

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Climate data from the nearest NOAA station, Big Sandy, Mt (12.8 mi from Big Sandy). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.