Roy, MT Weather & Growing Conditions
Overnight
33°F
Mostly Clear
Mostly clear, with a low around 33. West northwest wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 33°F | Mostly Clear | 5 mph WNW | 0% |
| Wednesday | 49°F | Sunny | 1 to 8 mph NW | 0% |
| Wednesday Night | 30°F | Partly Cloudy | 3 mph S | 0% |
| Thursday | 54°F | Mostly Sunny | 2 to 7 mph W | 1% |
| Thursday Night | 35°F | Partly Cloudy | 6 to 12 mph W | 1% |
| Friday | 56°F | Sunny | 5 to 8 mph WSW | 0% |
| Friday Night | 41°F | Partly Cloudy | 5 to 14 mph WSW | 0% |
| Saturday | 60°F | Sunny | 3 to 13 mph W | 0% |
| Saturday Night | 39°F | Partly Cloudy | 2 to 6 mph SSW | 0% |
| Sunday | 66°F | Partly Sunny | 2 to 9 mph WSW | 1% |
| Sunday Night | 41°F | Mostly Cloudy | 7 to 13 mph W | 1% |
| Monday | 55°F | Mostly Sunny | 7 mph WSW | 1% |
| Monday Night | 38°F | Mostly Cloudy | 6 mph SSW | 0% |
| Tuesday | 62°F | Mostly Sunny | 5 to 8 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Roy, MT
Last spring frost
May 14
First fall frost
Sep 24
Growing season
134 days
Hardiness zone
4b
Explore more for Roy, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Roy 8 Ne, Mt (5.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.