St. Xavier, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Xavier, a community in Big Horn County, Montana.
Tonight
54°F
Chance Showers And Thunderstorms then Patchy Fog
A chance of showers and thunderstorms before 7pm, then showers and thunderstorms between 7pm and midnight, then patchy fog and showers and thunderstorms. Cloudy. Low around 54, with temperatures rising to around 56 overnight. Northwest wind 3 to 8 mph. Chance of precipitation is 90%.
7-day forecast for St. Xavier
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 54°F | Chance Showers And Thunderstorms then Patchy Fog | 3 to 8 mph NW | 88% |
| Saturday | 65°F | Showers And Thunderstorms | 5 to 10 mph N | 90% |
| Saturday Night | 49°F | Showers And Thunderstorms | 10 to 15 mph NW | 90% |
| Sunday | 64°F | Rain Showers | 9 to 14 mph WNW | 75% |
| Sunday Night | 46°F | Chance Rain Showers then Mostly Cloudy | 2 to 6 mph W | 29% |
| Monday | 74°F | Mostly Sunny | 5 mph SE | 1% |
| Monday Night | 45°F | Mostly Clear | 6 mph SE | 0% |
| Tuesday | 80°F | Sunny | 1 to 5 mph N | 0% |
| Tuesday Night | 49°F | Partly Cloudy | 5 mph SE | 10% |
| Wednesday | 81°F | Mostly Sunny | 5 mph W | 5% |
| Wednesday Night | 48°F | Mostly Clear | 5 mph SE | 4% |
| Thursday | 82°F | Sunny | 5 mph SE | 2% |
| Thursday Night | 48°F | Partly Cloudy | 6 mph SE | 1% |
| Friday | 83°F | Mostly Sunny | 3 mph SW | 4% |
Forecast source: National Weather Service (api.weather.gov) for St. Xavier (45.457, -107.725). Updated through the day.
Growing snapshot for St. Xavier
Last spring frost
May 7
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
5a
More local growing data for St. Xavier: nearby ZIP 59075 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Yellowtail Dam, Mt (7.8 mi from St. Xavier). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.