Old Agency, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Old Agency, a community in Sanders County, Montana.
Today
76°F
Patchy Fog then Mostly Sunny
Patchy fog before 9am. Mostly sunny, with a high near 76. North northeast wind 0 to 5 mph.
7-day forecast for Old Agency
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 76°F | Patchy Fog then Mostly Sunny | 0 to 5 mph NNE | 11% |
| Tonight | 47°F | Partly Cloudy | 2 to 6 mph SSE | 3% |
| Sunday | 79°F | Sunny | 1 to 5 mph E | 0% |
| Sunday Night | 47°F | Mostly Clear | 3 mph SE | 0% |
| Monday | 82°F | Sunny | 3 mph SSE | 0% |
| Monday Night | 49°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 82°F | Sunny | 3 mph SE | 0% |
| Tuesday Night | 49°F | Partly Cloudy | 3 mph S | 1% |
| Wednesday | 81°F | Sunny | 2 to 6 mph SSW | 0% |
| Wednesday Night | 48°F | Partly Cloudy | 5 mph SW | 3% |
| Thursday | 80°F | Sunny | 5 mph ESE | 2% |
| Thursday Night | 48°F | Partly Cloudy | 5 mph SSW | 8% |
| Friday | 78°F | Mostly Sunny | 2 to 6 mph S | 8% |
| Friday Night | 46°F | Slight Chance Light Rain | 2 to 6 mph W | 22% |
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 Sep 19, 2026.