Roy, MT Weather & Growing Conditions
Tonight
55°F
Cloudy then Slight Chance Light Rain
A slight chance of rain after 5am. Cloudy, with a low around 55. North northeast wind 5 to 8 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Cloudy then Slight Chance Light Rain | 5 to 8 mph NNE | 19% |
| Saturday | 63°F | Chance Light Rain | 5 to 10 mph NE | 35% |
| Saturday Night | 54°F | Light Rain Likely | 5 to 8 mph NE | 60% |
| Sunday | 66°F | Light Rain Likely | 5 to 8 mph ENE | 56% |
| Sunday Night | 51°F | Mostly Cloudy | 6 to 9 mph SE | 3% |
| Monday | 76°F | Mostly Sunny | 6 to 13 mph SE | 0% |
| Monday Night | 51°F | Mostly Clear | 5 to 14 mph SSE | 0% |
| Tuesday | 81°F | Mostly Sunny | 6 mph WNW | 1% |
| Tuesday Night | 54°F | Partly Cloudy | 5 mph SSE | 1% |
| Wednesday | 81°F | Sunny | 3 to 7 mph WSW | 2% |
| Wednesday Night | 53°F | Mostly Clear | 6 mph SSE | 1% |
| Thursday | 82°F | Sunny | 3 to 9 mph S | 2% |
| Thursday Night | 54°F | Mostly Clear | 7 to 10 mph SSE | 3% |
| Friday | 82°F | Mostly Sunny | 5 to 10 mph SSE | 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 Sep 19, 2026.