Cyr, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cyr, a community in Missoula County, Montana.
Today
84°F
Patchy Smoke
Patchy smoke before 3pm. Sunny, with a high near 84. South wind around 5 mph.
7-day forecast for Cyr
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Patchy Smoke | 5 mph S | 0% |
| Tonight | 53°F | Mostly Clear | 1 to 6 mph W | 0% |
| Wednesday | 89°F | Sunny then Patchy Smoke | 1 to 5 mph WSW | 0% |
| Wednesday Night | 56°F | Clear | 5 mph WSW | 0% |
| Thursday | 96°F | Sunny | 1 to 6 mph SSW | 0% |
| Thursday Night | 59°F | Clear | 2 to 8 mph WSW | 0% |
| Friday | 96°F | Sunny | 1 to 12 mph WSW | 0% |
| Friday Night | 59°F | Clear | 6 to 13 mph WSW | 0% |
| Saturday | 92°F | Sunny | 3 to 12 mph SW | 0% |
| Saturday Night | 59°F | Mostly Clear | 3 to 10 mph WSW | 0% |
| Sunday | 90°F | Sunny | 2 to 7 mph WSW | 0% |
| Sunday Night | 57°F | Mostly Clear | 2 to 9 mph WSW | 0% |
| Monday | 90°F | Sunny | 1 to 7 mph N | 0% |
| Monday Night | 57°F | Mostly Clear | 2 to 8 mph WSW | 0% |
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 Aug 4, 2026.