Hays, MT Weather & Growing Conditions
Today
48°F
Sunny
Sunny. High near 48, with temperatures falling to around 42 in the afternoon. South wind 0 to 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 48°F | Sunny | 0 to 3 mph S | 0% |
| Tonight | 32°F | Partly Cloudy | 1 mph NNW | 0% |
| Thursday | 52°F | Mostly Sunny | 1 to 10 mph W | 0% |
| Thursday Night | 33°F | Partly Cloudy | 7 to 10 mph W | 0% |
| Friday | 52°F | Sunny | 6 to 9 mph WSW | 0% |
| Friday Night | 41°F | Partly Cloudy | 6 to 18 mph WSW | 0% |
| Saturday | 56°F | Sunny | 3 to 16 mph WSW | 0% |
| Saturday Night | 39°F | Partly Cloudy | 3 mph SSW | 0% |
| Sunday | 61°F | Partly Sunny | 3 to 12 mph WSW | 0% |
| Sunday Night | 39°F | Partly Cloudy | 8 to 16 mph W | 1% |
| Monday | 52°F | Mostly Sunny | 3 to 8 mph W | 2% |
| Monday Night | 39°F | Partly Cloudy | 5 mph SW | 0% |
| Tuesday | 58°F | Mostly Sunny | 5 to 10 mph WSW | 1% |
| Tuesday Night | 41°F | Partly Cloudy | 7 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Hays, MT
Last spring frost
May 23
First fall frost
Sep 23
Growing season
121 days
Hardiness zone
4b
Explore more for Hays, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Chinook 35Se, Mt (19.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.