Troy, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Troy, a city in Lincoln County, Montana.
Overnight
43°F
Mostly Clear
Mostly clear, with a low around 43. Wind around 0 mph.
7-day forecast for Troy
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 43°F | Mostly Clear | 0 mph | 0% |
| Tuesday | 89°F | Mostly Sunny | 0 to 3 mph NNW | 0% |
| Tuesday Night | 46°F | Mostly Clear | 0 to 3 mph WNW | 0% |
| Wednesday | 94°F | Sunny then Patchy Smoke | 0 to 3 mph WNW | 0% |
| Wednesday Night | 50°F | Areas Of Smoke then Mostly Clear | 0 to 3 mph SSW | 0% |
| Thursday | 101°F | Sunny | 0 to 5 mph SW | 0% |
| Thursday Night | 54°F | Mostly Clear | 0 to 5 mph SSW | 0% |
| Friday | 100°F | Sunny | 0 to 7 mph SSW | 0% |
| Friday Night | 54°F | Mostly Clear | 1 to 8 mph SSW | 0% |
| Saturday | 96°F | Sunny | 1 to 8 mph SW | 0% |
| Saturday Night | 52°F | Mostly Clear | 1 to 7 mph SSW | 0% |
| Sunday | 93°F | Sunny | 1 to 6 mph SSW | 0% |
| Sunday Night | 50°F | Mostly Clear | 0 to 6 mph WNW | 0% |
| Monday | 92°F | Sunny | 0 to 5 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Troy (48.460, -115.891). Updated through the day.
Growing snapshot for Troy
Last spring frost
May 14
First fall frost
Sep 25
Growing season
132 days
Hardiness zone
6a
More local growing data for Troy: nearby ZIP 59935 weather · frost dates · planting calendar · Montana frost dates
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Climate data from the nearest NOAA station, Troy, Mt (12.1 mi from Troy). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.