Ismay, MT Weather & Growing Conditions
Overnight
29°F
Mostly Clear
Mostly clear, with a low around 29. West wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 29°F | Mostly Clear | 1 mph W | 0% |
| Wednesday | 51°F | Mostly Sunny | 0 to 7 mph WNW | 0% |
| Wednesday Night | 30°F | Mostly Cloudy then Patchy Fog | 0 to 5 mph WNW | 0% |
| Thursday | 55°F | Patchy Fog then Mostly Sunny | 6 mph SSE | 0% |
| Thursday Night | 34°F | Partly Cloudy | 5 mph SSW | 1% |
| Friday | 53°F | Mostly Sunny | 5 to 10 mph W | 1% |
| Friday Night | 36°F | Mostly Clear | 5 to 10 mph SW | 0% |
| Saturday | 56°F | Sunny | 5 to 12 mph W | 0% |
| Saturday Night | 36°F | Mostly Clear | 3 to 7 mph SSW | 0% |
| Sunday | 63°F | Mostly Sunny | 7 to 10 mph SW | 0% |
| Sunday Night | 40°F | Partly Cloudy | 7 mph W | 0% |
| Monday | 57°F | Mostly Sunny | 7 mph W | 1% |
| Monday Night | 37°F | Partly Cloudy | 6 mph SW | 1% |
| Tuesday | 59°F | Mostly Sunny | 5 to 8 mph SSW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Ismay, MT
Last spring frost
May 22
First fall frost
Sep 15
Growing season
117 days
Hardiness zone
4a
Explore more for Ismay, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Mizpah 4 Nnw, Mt (16.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.