American Falls, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for American Falls, a city in Power County, Idaho.
Today
52°F
Partly Sunny
Partly sunny. High near 52, with temperatures falling to around 50 in the afternoon. East northeast wind around 8 mph.
7-day forecast for American Falls
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 52°F | Partly Sunny | 8 mph ENE | 0% |
| Tonight | 37°F | Cloudy | 3 to 8 mph NNE | 3% |
| Wednesday | 52°F | Partly Sunny | 3 to 10 mph WSW | 4% |
| Wednesday Night | 35°F | Patchy Fog then Partly Cloudy | 6 mph SSE | 0% |
| Thursday | 51°F | Partly Sunny | 6 mph W | 3% |
| Thursday Night | 35°F | Patchy Fog then Partly Cloudy | 5 to 8 mph SW | 3% |
| Friday | 52°F | Mostly Sunny | 2 to 6 mph SW | 1% |
| Friday Night | 36°F | Partly Cloudy | 2 to 6 mph SSE | 1% |
| Saturday | 55°F | Sunny | 6 mph ENE | 0% |
| Saturday Night | 37°F | Partly Cloudy | 3 to 7 mph E | 0% |
| Sunday | 59°F | Mostly Sunny | 8 mph SSE | 0% |
| Sunday Night | 39°F | Partly Cloudy | 8 mph SSE | 0% |
| Monday | 59°F | Partly Sunny | 6 mph ESE | 0% |
| Monday Night | 40°F | Mostly Cloudy | 6 mph S | 3% |
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 Nov 3, 2026.