Roy, MT Weather & Growing Conditions
Overnight
54°F
Slight Chance Light Rain
A slight chance of rain after 5am. Cloudy, with a low around 54. North wind around 5 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Slight Chance Light Rain | 5 mph N | 19% |
| Saturday | 67°F | Chance Light Rain | 5 to 10 mph NE | 35% |
| Saturday Night | 52°F | Light Rain Likely | 5 to 8 mph NE | 60% |
| Sunday | 65°F | Light Rain Likely | 5 to 8 mph ENE | 56% |
| Sunday Night | 51°F | Mostly Cloudy | 9 mph SE | 4% |
| Monday | 75°F | Mostly Sunny | 7 to 13 mph SE | 0% |
| Monday Night | 51°F | Mostly Clear | 5 to 14 mph SSE | 0% |
| Tuesday | 81°F | Sunny | 5 mph NW | 0% |
| Tuesday Night | 54°F | Mostly Clear | 5 mph SSE | 1% |
| Wednesday | 82°F | Mostly Sunny | 2 to 7 mph S | 1% |
| Wednesday Night | 55°F | Mostly Clear | 7 mph SSE | 2% |
| Thursday | 83°F | Sunny | 3 to 8 mph SW | 2% |
| Thursday Night | 55°F | Mostly Clear | 7 to 10 mph SE | 5% |
| Friday | 82°F | Mostly Sunny | 6 to 13 mph SSE | 2% |
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.