Helena West Side, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Helena West Side, a community in Lewis And Clark County, Montana.
Today
78°F
Patchy Smoke
Patchy smoke between 11am and 4pm. Sunny, with a high near 78. Northeast wind 0 to 7 mph.
7-day forecast for Helena West Side
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Patchy Smoke | 0 to 7 mph NE | 0% |
| Tonight | 51°F | Mostly Clear | 3 to 7 mph WNW | 1% |
| Wednesday | 87°F | Sunny | 2 to 8 mph W | 0% |
| Wednesday Night | 54°F | Mostly Clear | 5 to 9 mph W | 0% |
| Thursday | 94°F | Sunny | 2 to 13 mph W | 0% |
| Thursday Night | 58°F | Mostly Clear | 5 to 12 mph W | 0% |
| Friday | 99°F | Sunny | 1 to 18 mph WSW | 1% |
| Friday Night | 60°F | Mostly Clear | 9 to 17 mph W | 0% |
| Saturday | 95°F | Sunny | 3 to 14 mph W | 0% |
| Saturday Night | 60°F | Mostly Clear | 7 to 12 mph W | 0% |
| Sunday | 92°F | Sunny | 2 to 9 mph NW | 1% |
| Sunday Night | 58°F | Mostly Clear | 3 to 10 mph WNW | 1% |
| Monday | 89°F | Sunny | 2 to 9 mph N | 1% |
| Monday Night | 58°F | Mostly Clear | 3 to 9 mph NW | 4% |
Forecast source: National Weather Service (api.weather.gov) for Helena West Side (46.596, -112.128). Updated through the day.
Growing snapshot for Helena West Side
Last spring frost
May 9
First fall frost
Sep 30
Growing season
142 days
Hardiness zone
4b
More local growing data for Helena West Side: nearby ZIP 59636 weather · frost dates · planting calendar · Montana frost dates
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Climate data from the nearest NOAA station, Helena Rgnl Ap, Mt (7.2 mi from Helena West Side). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.