American Falls, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for American Falls, a city in Power County, Idaho.
This Afternoon
68°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Mostly cloudy. High near 68, with temperatures falling to around 60 in the afternoon. West southwest wind around 12 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
7-day forecast for American Falls
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Showers And Thunderstorms Likely | 12 mph WSW | 60% |
| Tonight | 48°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 7 to 10 mph SW | 55% |
| Saturday | 61°F | Showers And Thunderstorms Likely | 5 to 9 mph SW | 58% |
| Saturday Night | 47°F | Partly Cloudy | 3 mph S | 6% |
| Sunday | 68°F | Mostly Sunny | 5 mph NNE | 0% |
| Sunday Night | 48°F | Mostly Clear | 6 mph E | 0% |
| Monday | 73°F | Sunny | 3 to 7 mph NE | 0% |
| Monday Night | 52°F | Partly Cloudy | 6 mph ENE | 0% |
| Tuesday | 74°F | Mostly Sunny | 3 to 7 mph NNE | 1% |
| Tuesday Night | 52°F | Partly Cloudy | 6 mph S | 6% |
| Wednesday | 76°F | Sunny | 6 mph S | 2% |
| Wednesday Night | 51°F | Mostly Clear | 7 mph SSE | 3% |
| Thursday | 78°F | Sunny | 7 mph E | 2% |
| Thursday Night | 53°F | Partly Cloudy | 7 mph SE | 2% |
Forecast source: National Weather Service (api.weather.gov) for American Falls (42.783, -112.854). Updated through the day.
Growing snapshot for American Falls
Last spring frost
May 20
First fall frost
Sep 26
Growing season
125 days
Hardiness zone
6a
More local growing data for American Falls: nearby ZIP 83211 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Massacre Rocks Sp, Id (4.1 mi from American Falls). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.