Firth, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Firth, a city in Bingham County, Idaho.
Tonight
44°F
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
Showers and thunderstorms likely before 9pm, then a chance of showers and thunderstorms. Mostly cloudy. Low around 44, with temperatures rising to around 46 overnight. South wind 3 to 8 mph. Chance of precipitation is 70%.
7-day forecast for Firth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 44°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 3 to 8 mph S | 70% |
| Saturday | 62°F | Chance Showers And Thunderstorms | 3 to 7 mph SSW | 39% |
| Saturday Night | 43°F | Partly Cloudy | 3 mph SSE | 9% |
| Sunday | 68°F | Mostly Sunny | 3 mph SSW | 0% |
| Sunday Night | 43°F | Mostly Clear | 3 mph ENE | 0% |
| Monday | 75°F | Sunny | 5 mph NNE | 0% |
| Monday Night | 46°F | Partly Cloudy | 3 mph NE | 0% |
| Tuesday | 75°F | Mostly Sunny | 5 mph N | 1% |
| Tuesday Night | 47°F | Partly Cloudy | 3 mph SSE | 5% |
| Wednesday | 76°F | Sunny | 5 mph SSW | 3% |
| Wednesday Night | 46°F | Mostly Clear | 5 mph SE | 3% |
| Thursday | 79°F | Sunny | 5 mph NNE | 2% |
| Thursday Night | 49°F | Partly Cloudy | 5 mph SE | 0% |
| Friday | 79°F | Mostly Sunny | 7 mph SSE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Firth (43.306, -112.183). Updated through the day.
Growing snapshot for Firth
Last spring frost
May 5
First fall frost
Oct 3
Growing season
149 days
Hardiness zone
5b
More local growing data for Firth: nearby ZIP 83218 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Blackfoot Fire Dept, Id (12.6 mi from Firth). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.