Hays, MT Weather & Growing Conditions
Overnight
42°F
Mostly Clear
Mostly clear, with a low around 42. South southwest wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 42°F | Mostly Clear | 5 mph SSW | 0% |
| Tuesday | 75°F | Sunny | 5 to 9 mph W | 1% |
| Tuesday Night | 53°F | Partly Cloudy | 2 to 8 mph WSW | 2% |
| Wednesday | 84°F | Partly Sunny | 6 to 12 mph WSW | 0% |
| Wednesday Night | 57°F | Partly Cloudy | 3 to 10 mph WSW | 0% |
| Thursday | 91°F | Sunny | 6 to 13 mph W | 0% |
| Thursday Night | 59°F | Mostly Clear | 5 to 13 mph NE | 0% |
| Friday | 93°F | Sunny | 3 to 14 mph ESE | 0% |
| Friday Night | 61°F | Mostly Clear | 7 to 10 mph ENE | 0% |
| Saturday | 90°F | Sunny | 7 to 10 mph WNW | 0% |
| Saturday Night | 62°F | Partly Cloudy | 6 to 9 mph NE | 1% |
| Sunday | 88°F | Mostly Sunny | 6 to 12 mph NNE | 0% |
| Sunday Night | 60°F | Partly Cloudy | 8 to 12 mph NNE | 11% |
| Monday | 85°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 6 to 9 mph NE | 20% |
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 (13.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.