Old Agency, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Old Agency, a community in Sanders County, Montana.
Tonight
25°F
Mostly Cloudy
Mostly cloudy, with a low around 25. North wind around 1 mph.
7-day forecast for Old Agency
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 25°F | Mostly Cloudy | 1 mph N | 0% |
| Wednesday | 49°F | Mostly Sunny | 2 mph N | 0% |
| Wednesday Night | 25°F | Mostly Clear | 2 mph SSW | 0% |
| Thursday | 48°F | Partly Sunny | 1 to 5 mph SSW | 9% |
| Thursday Night | 26°F | Partly Cloudy | 3 to 7 mph SSW | 4% |
| Friday | 53°F | Partly Sunny | 6 mph S | 4% |
| Friday Night | 32°F | Mostly Cloudy | 3 to 12 mph SSW | 4% |
| Saturday | 59°F | Partly Sunny | 5 mph S | 2% |
| Saturday Night | 33°F | Mostly Cloudy then Slight Chance Light Rain | 3 to 9 mph S | 21% |
| Sunday | 61°F | Slight Chance Light Rain | 8 to 14 mph SSW | 21% |
| Sunday Night | 32°F | Mostly Cloudy | 2 to 8 mph SSW | 12% |
| Monday | 55°F | Partly Sunny then Slight Chance Light Rain | 2 mph SSW | 15% |
| Monday Night | 33°F | Slight Chance Light Rain | 5 mph SW | 15% |
| Tuesday | 58°F | Slight Chance Light Rain | 5 mph SSW | 15% |
Forecast source: National Weather Service (api.weather.gov) for Old Agency (47.325, -114.297). Updated through the day.
Growing snapshot for Old Agency
Last spring frost
May 12
First fall frost
Oct 2
Growing season
142 days
Hardiness zone
6a
More local growing data for Old Agency: nearby ZIP 59831 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Belknap
Bull Lake
Camas
Dixon
Heron
Hot Springs
Lonepine
Noxon
Paradise
Plains
Thompson Falls
Trout Creek
Climate data from the nearest NOAA station, Saint Ignatius, Mt (13.2 mi from Old Agency). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.