East Helena, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for East Helena, a city in Lewis And Clark County, Montana.
Overnight
25°F
Partly Cloudy
Partly cloudy. Low around 25, with temperatures rising to around 29 overnight. West southwest wind around 1 mph.
7-day forecast for East Helena
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 25°F | Partly Cloudy | 1 mph WSW | 0% |
| Wednesday | 49°F | Mostly Sunny | 1 mph W | 0% |
| Wednesday Night | 25°F | Mostly Clear | 1 to 5 mph SSW | 0% |
| Thursday | 48°F | Partly Sunny | 1 to 5 mph SW | 2% |
| Thursday Night | 27°F | Partly Cloudy | 3 to 7 mph SW | 2% |
| Friday | 51°F | Sunny | 3 to 8 mph SSW | 0% |
| Friday Night | 33°F | Partly Cloudy | 5 to 13 mph S | 0% |
| Saturday | 56°F | Mostly Sunny | 3 to 7 mph SE | 0% |
| Saturday Night | 33°F | Partly Cloudy | 5 to 8 mph SSE | 0% |
| Sunday | 61°F | Mostly Sunny | 5 to 8 mph S | 3% |
| Sunday Night | 32°F | Partly Cloudy | 1 to 7 mph WSW | 3% |
| Monday | 54°F | Mostly Sunny | 0 to 3 mph SSE | 1% |
| Monday Night | 32°F | Mostly Cloudy | 3 mph S | 1% |
| Tuesday | 58°F | Mostly Sunny | 2 to 6 mph SSW | 2% |
Forecast source: National Weather Service (api.weather.gov) for East Helena (46.584, -111.921). Updated through the day.
Growing snapshot for East Helena
Last spring frost
May 9
First fall frost
Sep 30
Growing season
142 days
Hardiness zone
5a
More local growing data for East Helena: nearby ZIP 59635 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Canyon Creek
Craig
Helena
Helena Valley Northeast
Helena Valley Northwest
Helena Valley Southeast
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 (7.9 mi from East Helena). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.