Declo, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Declo, a city in Cassia County, Idaho.
Today
83°F
Areas Of Smoke
Areas of smoke. Sunny. High near 83, with temperatures falling to around 81 in the afternoon. West wind 3 to 13 mph, with gusts as high as 22 mph.
7-day forecast for Declo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Areas Of Smoke | 3 to 13 mph W | 0% |
| Tonight | 55°F | Areas Of Smoke | 6 to 13 mph WSW | 0% |
| Wednesday | 89°F | Areas Of Smoke | 2 to 12 mph WSW | 0% |
| Wednesday Night | 59°F | Mostly Clear | 6 to 12 mph SW | 0% |
| Thursday | 95°F | Sunny | 2 to 9 mph N | 0% |
| Thursday Night | 64°F | Mostly Clear | 3 to 12 mph WSW | 0% |
| Friday | 97°F | Sunny | 2 to 12 mph SSW | 0% |
| Friday Night | 65°F | Mostly Clear | 5 to 15 mph WSW | 0% |
| Saturday | 96°F | Sunny | 2 to 9 mph WSW | 0% |
| Saturday Night | 66°F | Mostly Clear | 5 to 13 mph W | 0% |
| Sunday | 94°F | Sunny | 3 to 13 mph W | 1% |
| Sunday Night | 64°F | Mostly Clear | 5 to 14 mph WSW | 0% |
| Monday | 93°F | Sunny | 3 to 10 mph W | 1% |
| Monday Night | 63°F | Partly Cloudy | 5 to 13 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Declo (42.520, -113.629). Updated through the day.
Growing snapshot for Declo
Last spring frost
Jun 5
First fall frost
Sep 13
Growing season
96 days
Hardiness zone
6b
More local growing data for Declo: nearby ZIP 83311 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Malta, Id (12.1 mi from Declo). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.