Grant, MT Weather & Growing Conditions
This Afternoon
44°F
Mostly Sunny
Mostly sunny. High near 44, with temperatures falling to around 39 in the afternoon. South wind 3 to 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 44°F | Mostly Sunny | 3 to 8 mph S | 0% |
| Tonight | 26°F | Mostly Cloudy | 6 mph SSW | 0% |
| Wednesday | 45°F | Mostly Sunny | 1 to 5 mph NNE | 0% |
| Wednesday Night | 25°F | Mostly Clear | 1 to 12 mph SSE | 0% |
| Thursday | 43°F | Mostly Sunny | 7 to 13 mph S | 7% |
| Thursday Night | 25°F | Partly Cloudy | 9 mph SSW | 7% |
| Friday | 44°F | Mostly Sunny | 8 to 12 mph SSW | 4% |
| Friday Night | 26°F | Partly Cloudy | 8 to 14 mph SSW | 4% |
| Saturday | 47°F | Mostly Sunny | 6 to 10 mph SSW | 0% |
| Saturday Night | 28°F | Partly Cloudy | 6 to 16 mph S | 0% |
| Sunday | 51°F | Mostly Sunny | 10 to 17 mph S | 0% |
| Sunday Night | 29°F | Partly Cloudy | 10 to 14 mph S | 0% |
| Monday | 50°F | Partly Sunny | 7 to 12 mph S | 0% |
| Monday Night | 31°F | Mostly Cloudy | 7 to 13 mph S | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grant, MT
Growing season
72 days
Hardiness zone
5a
Explore more for Grant, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Dillon 18 Wsw, Mt (10.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.