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.
Today
78°F
Patchy Smoke
Patchy smoke between 11am and 3pm. Sunny, with a high near 78. North northeast wind 0 to 3 mph.
7-day forecast for Helena Valley Southeast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Patchy Smoke | 0 to 3 mph NNE | 0% |
| Tonight | 46°F | Mostly Clear | 3 mph WSW | 1% |
| Wednesday | 86°F | Sunny | 3 mph W | 0% |
| Wednesday Night | 49°F | Mostly Clear | 2 to 7 mph W | 0% |
| Thursday | 93°F | Sunny | 1 to 7 mph W | 0% |
| Thursday Night | 53°F | Mostly Clear | 3 to 10 mph W | 0% |
| Friday | 97°F | Sunny | 1 to 18 mph SSE | 0% |
| Friday Night | 55°F | Mostly Clear | 6 to 15 mph W | 0% |
| Saturday | 94°F | Sunny | 1 to 10 mph NW | 0% |
| Saturday Night | 55°F | Mostly Clear | 3 to 9 mph WNW | 0% |
| Sunday | 91°F | Sunny | 1 to 6 mph NW | 1% |
| Sunday Night | 54°F | Mostly Clear | 5 to 9 mph NW | 1% |
| Monday | 88°F | Sunny | 1 to 6 mph NNW | 2% |
| Monday Night | 53°F | Mostly Clear | 3 to 8 mph NW | 6% |
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
4b
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
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 Aug 4, 2026.