Nashua, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Nashua, a town in Valley County, Montana.
Tonight
55°F
Mostly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers after 5am. Mostly cloudy, with a low around 55. Northeast wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.
7-day forecast for Nashua
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Mostly Cloudy then Slight Chance Rain Showers | 14 mph NE | 19% |
| Saturday | 70°F | Chance Rain Showers | 12 to 16 mph ENE | 31% |
| Saturday Night | 52°F | Rain Showers Likely | 13 mph E | 55% |
| Sunday | 65°F | Chance Rain Showers | 14 mph E | 53% |
| Sunday Night | 49°F | Mostly Cloudy | 8 to 13 mph ESE | 5% |
| Monday | 73°F | Partly Sunny | 9 to 15 mph SE | 2% |
| Monday Night | 52°F | Mostly Clear | 9 to 14 mph SE | 0% |
| Tuesday | 80°F | Sunny | 9 mph SE | 0% |
| Tuesday Night | 54°F | Mostly Clear | 3 to 8 mph ESE | 1% |
| Wednesday | 81°F | Sunny | 7 mph SE | 5% |
| Wednesday Night | 54°F | Mostly Clear | 5 mph ESE | 4% |
| Thursday | 82°F | Sunny | 5 to 9 mph SE | 2% |
| Thursday Night | 55°F | Mostly Clear | 8 mph ESE | 3% |
| Friday | 82°F | Mostly Sunny | 8 to 12 mph SE | 1% |
Forecast source: National Weather Service (api.weather.gov) for Nashua (48.134, -106.357). Updated through the day.
Growing snapshot for Nashua
Last spring frost
May 12
First fall frost
Sep 24
Growing season
134 days
Hardiness zone
4a
More local growing data for Nashua: nearby ZIP 59248 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Nashua #2, Mt (9.2 mi from Nashua). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.