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
78°F
Patchy Smoke then Sunny
Patchy smoke before noon. Sunny, with a high near 78. East northeast wind 2 to 8 mph.
7-day forecast for St. Xavier
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Patchy Smoke then Sunny | 2 to 8 mph ENE | 0% |
| Tonight | 49°F | Mostly Clear | 5 to 8 mph ESE | 5% |
| Wednesday | 87°F | Sunny | 2 to 7 mph WNW | 0% |
| Wednesday Night | 53°F | Mostly Clear | 3 to 7 mph SSE | 0% |
| Thursday | 96°F | Sunny | 2 to 8 mph W | 0% |
| Thursday Night | 58°F | Mostly Clear | 3 to 8 mph ESE | 0% |
| Friday | 100°F | Sunny | 2 to 7 mph NW | 0% |
| Friday Night | 61°F | Mostly Clear | 8 mph WSW | 0% |
| Saturday | 97°F | Sunny | 6 to 10 mph NW | 0% |
| Saturday Night | 62°F | Mostly Clear | 5 to 8 mph E | 0% |
| Sunday | 96°F | Sunny | 5 to 9 mph NNW | 0% |
| Sunday Night | 62°F | Partly Cloudy | 8 mph ENE | 5% |
| Monday | 93°F | Mostly Sunny | 5 to 12 mph N | 2% |
| Monday Night | 62°F | Partly Cloudy | 7 to 10 mph ENE | 14% |
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 Aug 4, 2026.