Roy, MT Weather & Growing Conditions
This Afternoon
49°F
Sunny
Sunny. High near 49, with temperatures falling to around 43 in the afternoon. Northwest wind 0 to 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 49°F | Sunny | 0 to 8 mph NW | 0% |
| Tonight | 31°F | Patchy Fog | 1 to 5 mph SSW | 0% |
| Thursday | 54°F | Patchy Fog then Mostly Sunny | 2 to 8 mph W | 0% |
| Thursday Night | 36°F | Partly Cloudy | 6 to 10 mph W | 0% |
| Friday | 55°F | Sunny | 3 to 7 mph WSW | 0% |
| Friday Night | 43°F | Partly Cloudy | 3 to 15 mph WSW | 0% |
| Saturday | 61°F | Mostly Sunny | 3 to 15 mph W | 0% |
| Saturday Night | 39°F | Partly Cloudy | 2 to 8 mph SSW | 0% |
| Sunday | 67°F | Partly Sunny | 2 to 7 mph WSW | 1% |
| Sunday Night | 41°F | Mostly Cloudy | 7 to 13 mph W | 1% |
| Monday | 56°F | Partly Sunny | 5 to 8 mph W | 2% |
| Monday Night | 39°F | Mostly Cloudy | 6 mph SSW | 2% |
| Tuesday | 62°F | Mostly Sunny | 6 mph WSW | 1% |
| Tuesday Night | 42°F | Partly Cloudy | 7 mph SW | 1% |
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.