Alder, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alder, a community in Madison County, Montana.
Today
58°F
Patchy Fog
Patchy fog and showers and thunderstorms likely before 5pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 58. North northwest wind 2 to 6 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Alder
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 58°F | Patchy Fog | 2 to 6 mph NNW | 77% |
| Tonight | 41°F | Chance Light Rain | 0 to 6 mph ENE | 32% |
| Sunday | 66°F | Areas Of Fog then Partly Sunny | 0 to 3 mph W | 2% |
| Sunday Night | 41°F | Mostly Clear | 3 mph SE | 1% |
| Monday | 73°F | Sunny | 5 mph SW | 0% |
| Monday Night | 44°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 74°F | Sunny | 5 mph SW | 0% |
| Tuesday Night | 45°F | Partly Cloudy | 6 mph SSE | 2% |
| Wednesday | 75°F | Sunny | 7 mph SSW | 4% |
| Wednesday Night | 46°F | Mostly Clear | 6 to 14 mph S | 2% |
| Thursday | 77°F | Sunny | 8 mph SSW | 2% |
| Thursday Night | 47°F | Mostly Clear | 9 to 14 mph S | 2% |
| Friday | 77°F | Mostly Sunny | 7 to 12 mph S | 4% |
| Friday Night | 45°F | Partly Cloudy | 12 to 15 mph S | 14% |
Forecast source: National Weather Service (api.weather.gov) for Alder (45.322, -112.109). Updated through the day.
Growing snapshot for Alder
Last spring frost
May 24
First fall frost
Sep 22
Growing season
117 days
Hardiness zone
5a
More local growing data for Alder: nearby ZIP 59749 weather · frost dates · planting calendar · Montana frost dates
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Climate data from the nearest NOAA station, Laurin 2Ne, Mt (6.1 mi from Alder). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.