Simms, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Simms, a community in Cascade County, Montana.
Today
78°F
Sunny
Sunny, with a high near 78. Southeast wind 2 to 7 mph.
7-day forecast for Simms
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Sunny | 2 to 7 mph SE | 0% |
| Tonight | 48°F | Mostly Clear | 3 to 8 mph SE | 1% |
| Wednesday | 87°F | Sunny | 6 mph W | 0% |
| Wednesday Night | 52°F | Mostly Clear | 7 mph NW | 0% |
| Thursday | 95°F | Sunny | 8 mph WNW | 0% |
| Thursday Night | 55°F | Mostly Clear | 5 to 10 mph WNW | 0% |
| Friday | 99°F | Sunny | 2 to 20 mph W | 0% |
| Friday Night | 57°F | Mostly Clear | 9 to 20 mph W | 0% |
| Saturday | 95°F | Sunny | 5 to 13 mph WSW | 0% |
| Saturday Night | 56°F | Mostly Clear | 7 to 15 mph WNW | 1% |
| Sunday | 90°F | Sunny | 5 to 9 mph NNW | 0% |
| Sunday Night | 55°F | Partly Cloudy | 7 to 13 mph N | 1% |
| Monday | 87°F | Sunny | 5 to 8 mph NNE | 3% |
| Monday Night | 55°F | Mostly Clear | 7 to 10 mph NNE | 6% |
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
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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 Aug 4, 2026.