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.
Today
63°F
Showers And Thunderstorms
Showers and thunderstorms before 9am, then rain between 9am and noon, then showers and thunderstorms. Cloudy. High near 63, with temperatures falling to around 60 in the afternoon. Northwest wind around 6 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for East Helena
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 63°F | Showers And Thunderstorms | 6 mph NW | 96% |
| Tonight | 45°F | Slight Chance Light Rain then Mostly Cloudy | 1 to 5 mph SW | 16% |
| Sunday | 72°F | Mostly Sunny | 1 to 5 mph SE | 0% |
| Sunday Night | 44°F | Mostly Clear | 5 mph SSE | 0% |
| Monday | 76°F | Sunny | 1 to 8 mph SSE | 0% |
| Monday Night | 46°F | Mostly Clear | 2 to 7 mph SW | 0% |
| Tuesday | 77°F | Sunny | 1 to 5 mph SSE | 0% |
| Tuesday Night | 47°F | Mostly Clear | 3 mph S | 1% |
| Wednesday | 78°F | Sunny | 1 to 7 mph SSE | 1% |
| Wednesday Night | 48°F | Mostly Clear | 6 mph S | 2% |
| Thursday | 79°F | Sunny | 2 to 6 mph SSE | 2% |
| Thursday Night | 48°F | Mostly Clear | 6 mph S | 4% |
| Friday | 78°F | Mostly Sunny | 3 to 7 mph S | 3% |
| Friday Night | 46°F | Slight Chance Light Rain then Partly Cloudy | 9 mph W | 15% |
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 Sep 19, 2026.