Harman US

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

WhenTempForecastWindPrecip
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.