Cyr, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cyr, a community in Missoula County, Montana.
This Afternoon
50°F
Partly Sunny
Partly sunny. High near 50, with temperatures falling to around 45 in the afternoon. East wind around 1 mph.
7-day forecast for Cyr
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 50°F | Partly Sunny | 1 mph E | 0% |
| Tonight | 33°F | Mostly Cloudy | 1 mph N | 0% |
| Wednesday | 54°F | Sunny | 2 mph E | 0% |
| Wednesday Night | 33°F | Mostly Clear | 2 mph SSE | 2% |
| Thursday | 51°F | Partly Sunny | 2 to 6 mph SW | 10% |
| Thursday Night | 35°F | Mostly Cloudy | 5 mph SW | 4% |
| Friday | 53°F | Partly Sunny then Slight Chance Light Rain | 3 to 7 mph SSW | 19% |
| Friday Night | 39°F | Slight Chance Light Rain then Mostly Cloudy | 3 to 8 mph SW | 19% |
| Saturday | 57°F | Mostly Sunny | 2 to 6 mph S | 2% |
| Saturday Night | 38°F | Partly Cloudy then Slight Chance Light Rain | 2 to 7 mph SSE | 15% |
| Sunday | 60°F | Slight Chance Light Rain | 2 to 7 mph SSW | 17% |
| Sunday Night | 39°F | Slight Chance Light Rain then Mostly Cloudy | 5 mph SW | 16% |
| Monday | 56°F | Mostly Cloudy | 1 to 5 mph SSE | 12% |
| Monday Night | 39°F | Slight Chance Light Rain | 3 mph SSE | 20% |
Forecast source: National Weather Service (api.weather.gov) for Cyr (47.000, -114.588). Updated through the day.
Growing snapshot for Cyr
Last spring frost
May 18
First fall frost
Sep 25
Growing season
126 days
Hardiness zone
5b
More local growing data for Cyr: nearby ZIP 59846 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Alberton
Arlee
Bonner-West Riverside
Condon
East Missoula
Evaro
Frenchtown
Huson
Lolo
Missoula
Orchard Homes
Piltzville
Potomac
Seeley Lake
Turah
Twin Creeks
Wye
Climate data from the nearest NOAA station, Alberton, Mt (10.4 mi from Cyr). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.