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
82°F
Areas Of Smoke
Areas of smoke. Sunny. High near 82, with temperatures falling to around 80 in the afternoon. West southwest wind 6 to 13 mph, with gusts as high as 21 mph.
7-day forecast for American Falls
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Areas Of Smoke | 6 to 13 mph WSW | 0% |
| Tonight | 55°F | Areas Of Smoke | 8 to 14 mph SW | 0% |
| Wednesday | 87°F | Areas Of Smoke | 6 to 10 mph WSW | 0% |
| Wednesday Night | 57°F | Mostly Clear | 8 to 12 mph SW | 0% |
| Thursday | 93°F | Sunny | 3 to 9 mph W | 0% |
| Thursday Night | 62°F | Clear | 7 to 12 mph SW | 0% |
| Friday | 95°F | Sunny | 5 to 9 mph W | 0% |
| Friday Night | 64°F | Mostly Clear | 8 to 16 mph SW | 0% |
| Saturday | 94°F | Sunny | 5 to 9 mph SW | 0% |
| Saturday Night | 65°F | Mostly Clear | 7 to 15 mph WSW | 0% |
| Sunday | 93°F | Sunny | 6 to 14 mph WSW | 0% |
| Sunday Night | 64°F | Mostly Clear | 7 to 16 mph WSW | 0% |
| Monday | 92°F | Sunny | 7 to 13 mph SW | 0% |
| Monday Night | 63°F | Partly Cloudy | 9 to 14 mph SW | 1% |
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 Aug 4, 2026.