Ronan, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Ronan, a city in Lake County, Montana.
Tonight
48°F
Slight Chance Rain Showers then Patchy Fog
A slight chance of rain showers before 10pm, then patchy fog. Mostly cloudy, with a low around 48. East wind 0 to 3 mph. Chance of precipitation is 20%.
7-day forecast for Ronan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Slight Chance Rain Showers then Patchy Fog | 0 to 3 mph E | 15% |
| Saturday | 72°F | Patchy Fog then Mostly Sunny | 2 mph NNW | 12% |
| Saturday Night | 46°F | Partly Cloudy | 5 mph E | 1% |
| Sunday | 74°F | Patchy Fog then Sunny | 2 mph SSW | 0% |
| Sunday Night | 47°F | Clear | 1 to 5 mph ENE | 0% |
| Monday | 77°F | Sunny | 2 mph S | 0% |
| Monday Night | 48°F | Mostly Clear | 2 mph S | 1% |
| Tuesday | 75°F | Sunny | 2 mph WNW | 0% |
| Tuesday Night | 48°F | Partly Cloudy | 2 mph ESE | 1% |
| Wednesday | 73°F | Sunny | 2 mph SSW | 1% |
| Wednesday Night | 47°F | Partly Cloudy | 2 mph E | 4% |
| Thursday | 76°F | Sunny | 1 mph WNW | 2% |
| Thursday Night | 48°F | Partly Cloudy | 3 mph E | 1% |
| Friday | 75°F | Mostly Sunny | 3 mph SSW | 3% |
Forecast source: National Weather Service (api.weather.gov) for Ronan (47.529, -114.101). Updated through the day.
Growing snapshot for Ronan
Last spring frost
May 10
First fall frost
Oct 5
Growing season
147 days
Hardiness zone
6a
More local growing data for Ronan: nearby ZIP 59864 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
St. Ignatius
Swan Lake
Turtle Lake
Climate data from the nearest NOAA station, Polson, Mt (10.4 mi from Ronan). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.