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
28°F
Mostly Cloudy
Mostly cloudy, with a low around 28. Wind around 0 mph.
7-day forecast for St. Ignatius
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 28°F | Mostly Cloudy | 0 mph | 0% |
| Wednesday | 47°F | Mostly Sunny | 2 mph N | 0% |
| Wednesday Night | 28°F | Mostly Clear | 3 mph SE | 0% |
| Thursday | 46°F | Partly Sunny | 3 mph S | 14% |
| Thursday Night | 29°F | Mostly Cloudy | 5 mph SSE | 7% |
| Friday | 50°F | Partly Sunny | 5 mph SSE | 8% |
| Friday Night | 35°F | Mostly Cloudy | 5 to 9 mph SSE | 8% |
| Saturday | 57°F | Partly Sunny | 5 mph SSE | 2% |
| Saturday Night | 37°F | Mostly Cloudy then Slight Chance Light Rain | 3 to 12 mph SE | 23% |
| Sunday | 58°F | Slight Chance Light Rain | 6 to 10 mph SSW | 23% |
| Sunday Night | 35°F | Slight Chance Light Rain | 6 mph S | 15% |
| Monday | 53°F | Partly Sunny then Slight Chance Light Rain | 3 mph SSE | 17% |
| Monday Night | 36°F | Slight Chance Light Rain | 1 to 5 mph SE | 18% |
| Tuesday | 56°F | Slight Chance Light Rain | 5 mph S | 18% |
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
Big Arm
Charlo
Dayton
Elmo
Finley Point
Jette
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 Nov 4, 2026.