St. Ignatius, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Ignatius, a town in Lake County, Montana.
Tonight
48°F
Partly Cloudy
Partly cloudy, with a low around 48. South southeast wind 3 to 9 mph.
7-day forecast for St. Ignatius
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Partly Cloudy | 3 to 9 mph SSE | 6% |
| Sunday | 77°F | Sunny | 5 mph NNE | 1% |
| Sunday Night | 49°F | Mostly Clear | 5 mph E | 0% |
| Monday | 79°F | Sunny | 3 mph S | 0% |
| Monday Night | 50°F | Mostly Clear | 5 mph SE | 0% |
| Tuesday | 79°F | Sunny | 3 mph SSW | 0% |
| Tuesday Night | 51°F | Partly Cloudy | 5 mph ESE | 2% |
| Wednesday | 77°F | Mostly Sunny | 5 mph SSW | 2% |
| Wednesday Night | 49°F | Partly Cloudy | 5 mph S | 10% |
| Thursday | 75°F | Mostly Sunny | 1 to 5 mph SW | 1% |
| Thursday Night | 49°F | Partly Cloudy | 3 mph ENE | 9% |
| Friday | 74°F | Mostly Sunny | 5 mph SSW | 10% |
| Friday Night | 47°F | Mostly Cloudy then Slight Chance Light Rain | 5 mph ESE | 18% |
| Saturday | 66°F | Slight Chance Light Rain then Partly Sunny | 5 mph WSW | 15% |
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
Nearby towns & communities
Bear Dance
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Dayton
Elmo
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Kerr
Kicking Horse
Kings Point
Lake Mary Ronan
Lindisfarne
Niarada
Pablo
Polson
Ravalli
Rocky Point
Rollins
Ronan
Swan Lake
Turtle Lake
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 Sep 20, 2026.