Simms, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Simms, a community in Cascade County, Montana.
Tonight
52°F
Chance Light Rain
A chance of rain after 9pm. Cloudy, with a low around 52. North wind 5 to 8 mph. Chance of precipitation is 30%.
7-day forecast for Simms
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Chance Light Rain | 5 to 8 mph N | 32% |
| Saturday | 66°F | Chance Light Rain then Cloudy | 7 mph NE | 25% |
| Saturday Night | 47°F | Mostly Cloudy | 2 to 7 mph S | 3% |
| Sunday | 75°F | Sunny | 2 to 6 mph S | 1% |
| Sunday Night | 48°F | Mostly Clear | 3 to 8 mph S | 0% |
| Monday | 80°F | Sunny | 5 to 8 mph SSW | 0% |
| Monday Night | 50°F | Mostly Clear | 7 mph SW | 0% |
| Tuesday | 78°F | Sunny | 6 mph WSW | 0% |
| Tuesday Night | 50°F | Partly Cloudy | 3 to 7 mph SSE | 0% |
| Wednesday | 79°F | Sunny | 5 to 9 mph SW | 0% |
| Wednesday Night | 50°F | Mostly Clear | 3 to 9 mph SW | 3% |
| Thursday | 79°F | Sunny | 5 to 10 mph SSW | 1% |
| Thursday Night | 51°F | Partly Cloudy | 5 to 9 mph S | 2% |
| Friday | 79°F | Mostly Sunny | 5 to 14 mph SSW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Simms (47.493, -111.954). Updated through the day.
Growing snapshot for Simms
Last spring frost
Jun 2
First fall frost
Sep 10
Growing season
96 days
Hardiness zone
4b
More local growing data for Simms: nearby ZIP 59477 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
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Gibson Flats
Great Falls
Hardy
Malmstrom AFB
Monarch
Neihart
Pleasant Valley Colony
Riceville
Sand Coulee
Stockett
Sun Prairie
Sun River
Tracy
Ulm
Vaughn
Climate data from the nearest NOAA station, Sun Rvr 4 S, Mt (11.3 mi from Simms). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.