Old Agency, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Old Agency, a community in Sanders County, Montana.
Overnight
44°F
Patchy Smoke
Patchy smoke. Mostly clear, with a low around 44. East wind around 1 mph.
7-day forecast for Old Agency
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 44°F | Patchy Smoke | 1 mph E | 0% |
| Tuesday | 83°F | Patchy Smoke then Sunny | 1 to 9 mph NNE | 0% |
| Tuesday Night | 49°F | Mostly Clear | 2 to 9 mph S | 0% |
| Wednesday | 90°F | Sunny | 1 to 6 mph ENE | 0% |
| Wednesday Night | 51°F | Clear | 3 to 8 mph WSW | 0% |
| Thursday | 96°F | Sunny | 1 to 5 mph S | 0% |
| Thursday Night | 55°F | Clear | 3 to 9 mph SW | 0% |
| Friday | 98°F | Sunny | 2 to 12 mph SW | 0% |
| Friday Night | 55°F | Clear | 6 to 17 mph SW | 0% |
| Saturday | 96°F | Sunny | 6 to 14 mph WSW | 0% |
| Saturday Night | 54°F | Mostly Clear | 3 to 15 mph WSW | 0% |
| Sunday | 92°F | Sunny | 2 to 6 mph WNW | 0% |
| Sunday Night | 53°F | Mostly Clear | 2 to 9 mph WSW | 0% |
| Monday | 91°F | Sunny | 1 to 6 mph N | 0% |
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 Aug 4, 2026.