Cyr, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cyr, a community in Missoula County, Montana.
This Afternoon
77°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 3pm and 5pm. Partly sunny, with a high near 77. West wind around 6 mph. Chance of precipitation is 20%.
7-day forecast for Cyr
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Slight Chance Showers And Thunderstorms | 6 mph W | 16% |
| Tonight | 52°F | Chance Showers And Thunderstorms | 0 to 3 mph E | 33% |
| Saturday | 75°F | Mostly Sunny | 0 to 3 mph SSE | 10% |
| Saturday Night | 49°F | Mostly Clear | 2 mph ESE | 2% |
| Sunday | 80°F | Sunny | 3 mph ESE | 0% |
| Sunday Night | 51°F | Clear | 2 mph SSE | 0% |
| Monday | 82°F | Sunny | 3 mph S | 0% |
| Monday Night | 52°F | Mostly Clear | 5 mph SW | 0% |
| Tuesday | 79°F | Sunny | 3 mph S | 0% |
| Tuesday Night | 51°F | Mostly Clear | 3 mph SW | 1% |
| Wednesday | 78°F | Sunny | 2 to 6 mph SSW | 1% |
| Wednesday Night | 51°F | Mostly Clear | 3 mph SW | 2% |
| Thursday | 81°F | Sunny | 5 mph ESE | 2% |
| Thursday Night | 52°F | Partly Cloudy | 3 mph S | 1% |
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 Sep 18, 2026.