Roy, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Roy, a community in Fergus County, Montana.
Today
64°F
Chance Light Rain
A chance of rain. Cloudy, with a high near 64. Northeast wind 6 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Roy
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 64°F | Chance Light Rain | 6 to 10 mph NE | 42% |
| Tonight | 51°F | Light Rain Likely | 5 to 8 mph ENE | 56% |
| Sunday | 63°F | Light Rain Likely | 5 to 8 mph E | 57% |
| Sunday Night | 50°F | Mostly Cloudy | 10 mph SE | 5% |
| Monday | 74°F | Mostly Sunny | 7 to 10 mph SSE | 0% |
| Monday Night | 52°F | Mostly Clear | 6 to 14 mph S | 0% |
| Tuesday | 79°F | Sunny | 6 mph WNW | 1% |
| Tuesday Night | 55°F | Mostly Clear | 7 mph S | 1% |
| Wednesday | 80°F | Sunny | 7 mph E | 3% |
| Wednesday Night | 56°F | Mostly Clear | 7 to 10 mph S | 3% |
| Thursday | 81°F | Sunny | 5 to 8 mph WSW | 3% |
| Thursday Night | 56°F | Mostly Clear | 12 mph SSE | 4% |
| Friday | 80°F | Mostly Sunny | 7 to 13 mph S | 2% |
| Friday Night | 52°F | Partly Cloudy | 14 mph SSW | 14% |
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
Brooks
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Deerfield Colony
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Fords Creek Colony
Grass Range
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 Sep 19, 2026.