Helena, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Helena, a city in Lewis And Clark County, Montana.
This Afternoon
61°F
Rain
Rain before 5pm. Cloudy, with a high near 61. North wind around 5 mph. Chance of precipitation is 80%.
7-day forecast for Helena
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 61°F | Rain | 5 mph N | 75% |
| Tonight | 45°F | Mostly Cloudy | 3 mph SW | 8% |
| Sunday | 72°F | Sunny | 0 to 5 mph S | 2% |
| Sunday Night | 45°F | Mostly Clear | 5 mph SSW | 0% |
| Monday | 76°F | Sunny | 1 to 7 mph SSE | 0% |
| Monday Night | 46°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 78°F | Sunny | 1 to 6 mph SE | 0% |
| Tuesday Night | 49°F | Partly Cloudy | 5 mph SSW | 5% |
| Wednesday | 78°F | Mostly Sunny | 1 to 7 mph S | 1% |
| Wednesday Night | 49°F | Partly Cloudy | 5 mph SW | 3% |
| Thursday | 78°F | Sunny | 2 to 8 mph SSW | 2% |
| Thursday Night | 49°F | Partly Cloudy | 5 mph SSW | 5% |
| Friday | 77°F | Mostly Sunny | 2 to 8 mph S | 6% |
| Friday Night | 48°F | Mostly Cloudy | 6 to 9 mph SW | 12% |
Forecast source: National Weather Service (api.weather.gov) for Helena (46.595, -112.019). Updated through the day.
Growing snapshot for Helena
Last spring frost
May 9
First fall frost
Sep 30
Growing season
142 days
More local growing data for Helena: nearby ZIP 59625 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Canyon Creek
Craig
East 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 (3.6 mi from Helena). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.