Hysham, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hysham, a town in Treasure County, Montana.
Tonight
56°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms between 8pm and 1am, then showers and thunderstorms. Mostly cloudy. Low around 56, with temperatures rising to around 58 overnight. North wind 3 to 7 mph. Chance of precipitation is 80%.
7-day forecast for Hysham
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Chance Showers And Thunderstorms | 3 to 7 mph N | 84% |
| Saturday | 63°F | Showers And Thunderstorms | 6 to 12 mph NE | 96% |
| Saturday Night | 53°F | Showers And Thunderstorms | 9 mph ENE | 95% |
| Sunday | 63°F | Rain Showers | 7 mph NE | 87% |
| Sunday Night | 50°F | Slight Chance Rain Showers then Cloudy | 0 to 5 mph NE | 21% |
| Monday | 72°F | Partly Sunny | 3 mph SE | 0% |
| Monday Night | 49°F | Mostly Clear | 1 to 5 mph ESE | 0% |
| Tuesday | 79°F | Sunny | 2 mph SSW | 0% |
| Tuesday Night | 52°F | Partly Cloudy | 1 mph NE | 4% |
| Wednesday | 80°F | Mostly Sunny | 0 to 3 mph WSW | 3% |
| Wednesday Night | 52°F | Mostly Clear | 1 mph S | 4% |
| Thursday | 81°F | Sunny | 3 mph S | 2% |
| Thursday Night | 52°F | Partly Cloudy | 2 mph ESE | 2% |
| Friday | 82°F | Mostly Sunny | 3 mph SE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Hysham (46.291, -107.230). Updated through the day.
Growing snapshot for Hysham
Last spring frost
May 10
First fall frost
Sep 29
Growing season
141 days
Hardiness zone
4b
More local growing data for Hysham: nearby ZIP 59038 weather · frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Hysham, Mt (4.8 mi from Hysham). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.