Monarch, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Monarch, a community in Cascade County, Montana.
Tonight
48°F
Chance Showers And Thunderstorms then Light Rain Likely
A chance of showers and thunderstorms before midnight, then rain likely. Cloudy, with a low around 48. South wind around 2 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Monarch
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Chance Showers And Thunderstorms then Light Rain Likely | 2 mph S | 73% |
| Saturday | 56°F | Light Rain Likely | 1 to 6 mph NE | 73% |
| Saturday Night | 45°F | Chance Light Rain | 0 to 5 mph SE | 35% |
| Sunday | 66°F | Patchy Fog then Mostly Sunny | 0 to 3 mph WSW | 10% |
| Sunday Night | 44°F | Mostly Clear | 5 mph SSE | 0% |
| Monday | 72°F | Sunny | 6 mph SW | 0% |
| Monday Night | 48°F | Mostly Clear | 3 to 7 mph SW | 0% |
| Tuesday | 72°F | Mostly Sunny | 6 mph SW | 1% |
| Tuesday Night | 48°F | Mostly Clear | 6 mph S | 1% |
| Wednesday | 73°F | Sunny | 8 mph SW | 2% |
| Wednesday Night | 48°F | Mostly Clear | 6 mph SSW | 2% |
| Thursday | 75°F | Sunny | 6 mph SSW | 2% |
| Thursday Night | 51°F | Mostly Clear | 5 to 10 mph S | 2% |
| Friday | 75°F | Mostly Sunny | 8 mph SSW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Monarch (47.100, -110.845). Updated through the day.
Growing snapshot for Monarch
Last spring frost
Jun 6
First fall frost
Sep 12
Growing season
99 days
Hardiness zone
4b
More local growing data for Monarch: nearby ZIP 59463 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Belt
Big Stone Colony
Black Eagle
Cascade
Cascade Colony
Centerville
Fair Haven Colony
Fairfield
Fort Shaw
Gibson Flats
Great Falls
Hardy
Malmstrom AFB
Neihart
Pleasant Valley Colony
Riceville
Sand Coulee
Simms
Stockett
Sun Prairie
Sun River
Tracy
Ulm
Vaughn
Climate data from the nearest NOAA station, Neihart 8 Nnw, Mt (4.3 mi from Monarch). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.