Hays, MT Weather & Growing Conditions
This Afternoon
66°F
Slight Chance Light Rain
A slight chance of rain. Cloudy, with a high near 66. East northeast wind around 9 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Slight Chance Light Rain | 9 mph ENE | 20% |
| Tonight | 50°F | Slight Chance Light Rain | 2 to 7 mph NE | 19% |
| Sunday | 67°F | Mostly Sunny | 2 to 8 mph E | 10% |
| Sunday Night | 50°F | Mostly Cloudy | 5 to 8 mph SE | 0% |
| Monday | 72°F | Mostly Sunny | 5 to 9 mph SE | 0% |
| Monday Night | 50°F | Mostly Clear | 2 to 10 mph SE | 0% |
| Tuesday | 78°F | Sunny | 5 mph SSW | 0% |
| Tuesday Night | 55°F | Mostly Clear | 5 mph ESE | 1% |
| Wednesday | 79°F | Mostly Sunny | 2 to 6 mph WSW | 1% |
| Wednesday Night | 55°F | Partly Cloudy | 5 mph SW | 6% |
| Thursday | 78°F | Mostly Sunny | 6 mph WSW | 1% |
| Thursday Night | 55°F | Mostly Clear | 3 to 8 mph E | 6% |
| Friday | 77°F | Mostly Sunny | 3 to 8 mph ESE | 3% |
| Friday Night | 51°F | Slight Chance Light Rain | 6 to 10 mph NNE | 15% |
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 Sep 19, 2026.