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.
Today
62°F
Rain Showers
Rain showers and patchy fog. Cloudy, with a high near 62. West northwest wind 7 to 13 mph. Chance of precipitation is 100%.
7-day forecast for St. Xavier
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 62°F | Rain Showers | 7 to 13 mph WNW | 100% |
| Tonight | 45°F | Scattered Rain Showers then Areas Of Fog | 2 to 6 mph N | 32% |
| Monday | 72°F | Areas Of Fog then Mostly Sunny | 2 to 6 mph ESE | 6% |
| Monday Night | 44°F | Mostly Clear | 7 mph SE | 0% |
| Tuesday | 79°F | Sunny | 2 to 6 mph SE | 0% |
| Tuesday Night | 49°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSE | 21% |
| Wednesday | 80°F | Slight Chance Rain Showers then Mostly Sunny | 2 to 7 mph W | 16% |
| Wednesday Night | 48°F | Mostly Clear | 6 mph SW | 2% |
| Thursday | 84°F | Sunny | 5 mph NE | 0% |
| Thursday Night | 49°F | Mostly Clear | 7 mph SE | 1% |
| Friday | 86°F | Sunny | 5 mph SSE | 0% |
| Friday Night | 51°F | Mostly Clear | 3 to 7 mph S | 1% |
| Saturday | 78°F | Mostly Sunny | 6 to 12 mph WNW | 5% |
| Saturday Night | 45°F | Partly Cloudy | 6 to 10 mph NE | 13% |
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 20, 2026.