Roy, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Roy, a community in Fergus County, Montana.
Tonight
34°F
Partly Cloudy
Partly cloudy, with a low around 34. West southwest wind 2 to 8 mph.
7-day forecast for Roy
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 34°F | Partly Cloudy | 2 to 8 mph WSW | 0% |
| Wednesday | 47°F | Mostly Sunny | 3 to 10 mph WNW | 0% |
| Wednesday Night | 32°F | Partly Cloudy | 6 mph WSW | 0% |
| Thursday | 54°F | Mostly Sunny | 0 to 5 mph W | 0% |
| Thursday Night | 36°F | Partly Cloudy | 0 to 14 mph W | 1% |
| Friday | 55°F | Sunny | 8 to 13 mph WSW | 3% |
| Friday Night | 39°F | Partly Cloudy | 8 to 24 mph W | 7% |
| Saturday | 52°F | Sunny | 5 to 24 mph W | 1% |
| Saturday Night | 36°F | Partly Cloudy | 5 to 9 mph WSW | 0% |
| Sunday | 62°F | Mostly Sunny | 7 mph WSW | 0% |
| Sunday Night | 41°F | Partly Cloudy | 7 to 13 mph W | 1% |
| Monday | 54°F | Partly Sunny | 6 to 9 mph WSW | 0% |
| Monday Night | 40°F | Mostly Cloudy | 8 mph SSW | 1% |
| Tuesday | 60°F | Mostly Sunny | 9 mph SW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Roy (47.334, -108.960). Updated through the day.
Growing snapshot for Roy
Last spring frost
May 14
First fall frost
Sep 24
Growing season
134 days
Hardiness zone
4b
More local growing data for Roy: nearby ZIP 59471 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Ayers Ranch Colony
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Deerfield Colony
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Fords Creek Colony
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Hilger
King Ranch Colony
Lewistown
Lewistown Heights
Moore
Warm Spring Creek
Winifred
Climate data from the nearest NOAA station, Roy 8 Ne, Mt (5.2 mi from Roy). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.