Helena Valley Southeast, MT Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Helena Valley Southeast, a community in Lewis And Clark County, Montana.

Overnight

25°F

Partly Cloudy

Partly cloudy. Low around 25, with temperatures rising to around 28 overnight. Wind around 0 mph.

7-day forecast for Helena Valley Southeast

When	Temp	Forecast	Wind	Precip
Overnight	25°F	Partly Cloudy	0 mph	0%
Wednesday	49°F	Mostly Sunny	1 mph WSW	0%
Wednesday Night	25°F	Mostly Clear	3 mph SSW	0%
Thursday	49°F	Partly Sunny	1 to 5 mph SSW	2%
Thursday Night	27°F	Partly Cloudy	7 mph SW	2%
Friday	51°F	Mostly Sunny	5 to 8 mph SSW	0%
Friday Night	32°F	Partly Cloudy	5 to 13 mph S	0%
Saturday	56°F	Mostly Sunny	3 to 7 mph SSE	0%
Saturday Night	32°F	Partly Cloudy	5 to 8 mph SSE	0%
Sunday	61°F	Mostly Sunny	8 mph S	3%
Sunday Night	32°F	Partly Cloudy	0 to 7 mph W	3%
Monday	54°F	Mostly Sunny	2 mph SE	1%
Monday Night	32°F	Mostly Cloudy	3 mph S	1%
Tuesday	58°F	Mostly Sunny	2 to 6 mph S	2%

Forecast source: National Weather Service (api.weather.gov) for Helena Valley Southeast (46.623, -111.901). Updated through the day.

Growing snapshot for Helena Valley Southeast

Last spring frost

May 9

First fall frost

Sep 30

Growing season

142 days

Hardiness zone

More local growing data for Helena Valley Southeast: nearby ZIP 59602 weather · frost dates · planting calendar · Montana frost dates

Nearby towns & communities

Canyon Creek Craig East Helena Helena Helena Valley Northeast Helena Valley Northwest Helena Valley West Central Helena West Side Lincoln Marysville Milford Colony Montana City Rimini South Hills Spokane Creek Unionville Wolf Creek York

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Climate data from the nearest NOAA station, Helena Rgnl Ap, Mt (8.8 mi from Helena Valley Southeast). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.