Declo, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Declo, a city in Cassia County, Idaho.
This Afternoon
68°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 4pm, then a chance of showers and thunderstorms. Mostly cloudy. High near 68, with temperatures falling to around 62 in the afternoon. West wind around 13 mph, with gusts as high as 21 mph. Chance of precipitation is 70%.
7-day forecast for Declo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Showers And Thunderstorms Likely | 13 mph W | 68% |
| Tonight | 48°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 7 to 10 mph SW | 33% |
| Saturday | 65°F | Showers And Thunderstorms Likely | 6 to 10 mph WSW | 66% |
| Saturday Night | 47°F | Partly Cloudy | 3 mph S | 5% |
| Sunday | 72°F | Sunny | 5 mph ENE | 0% |
| Sunday Night | 49°F | Mostly Clear | 5 mph ESE | 0% |
| Monday | 77°F | Sunny | 5 to 8 mph E | 0% |
| Monday Night | 52°F | Partly Cloudy | 5 mph ESE | 0% |
| Tuesday | 77°F | Mostly Sunny | 6 mph ENE | 3% |
| Tuesday Night | 52°F | Partly Cloudy | 3 mph SSW | 4% |
| Wednesday | 79°F | Sunny | 5 mph E | 3% |
| Wednesday Night | 52°F | Mostly Clear | 6 mph ESE | 2% |
| Thursday | 81°F | Sunny | 7 mph ESE | 2% |
| Thursday Night | 54°F | Partly Cloudy | 7 mph SE | 0% |
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 Sep 19, 2026.