St. Ignatius, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Ignatius, a town in Lake County, Montana.
Today
79°F
Patchy Smoke
Patchy smoke before 1pm. Sunny, with a high near 79. North wind 1 to 8 mph.
7-day forecast for St. Ignatius
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Patchy Smoke | 1 to 8 mph N | 0% |
| Tonight | 50°F | Mostly Clear | 3 to 7 mph ESE | 0% |
| Wednesday | 86°F | Sunny | 2 to 6 mph W | 0% |
| Wednesday Night | 53°F | Clear | 6 mph E | 0% |
| Thursday | 93°F | Sunny | 5 mph SSW | 0% |
| Thursday Night | 56°F | Clear | 3 to 7 mph S | 0% |
| Friday | 94°F | Sunny | 3 to 9 mph SW | 0% |
| Friday Night | 56°F | Clear | 5 to 14 mph SW | 0% |
| Saturday | 92°F | Sunny | 6 to 10 mph SSW | 0% |
| Saturday Night | 55°F | Mostly Clear | 3 to 12 mph SSW | 0% |
| Sunday | 89°F | Sunny | 1 to 6 mph SW | 0% |
| Sunday Night | 54°F | Mostly Clear | 1 to 7 mph N | 0% |
| Monday | 87°F | Sunny | 1 to 6 mph NNW | 0% |
| Monday Night | 54°F | Mostly Clear | 2 to 7 mph ENE | 1% |
Forecast source: National Weather Service (api.weather.gov) for St. Ignatius (47.318, -114.095). Updated through the day.
Growing snapshot for St. Ignatius
Last spring frost
May 12
First fall frost
Oct 2
Growing season
142 days
Hardiness zone
6a
More local growing data for St. Ignatius: nearby ZIP 59863 weather · frost dates · planting calendar · Montana frost dates
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Climate data from the nearest NOAA station, Saint Ignatius, Mt (4.1 mi from St. Ignatius). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.