Firth, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Firth, a city in Bingham County, Idaho.
Overnight
44°F
Slight Chance Light Rain
A slight chance of rain after 3am. Mostly cloudy. Low around 44, with temperatures rising to around 46 overnight. South southwest wind around 5 mph. Chance of precipitation is 20%.
7-day forecast for Firth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 44°F | Slight Chance Light Rain | 5 mph SSW | 22% |
| Saturday | 62°F | Chance Light Rain then Slight Chance Showers And Thunderstorms | 3 to 7 mph SSW | 29% |
| Saturday Night | 39°F | Partly Cloudy | 0 to 5 mph SSE | 8% |
| Sunday | 69°F | Mostly Sunny | 3 mph W | 1% |
| Sunday Night | 40°F | Mostly Clear | 3 mph ENE | 0% |
| Monday | 74°F | Sunny | 5 mph NNE | 0% |
| Monday Night | 43°F | Mostly Clear | 3 mph ENE | 0% |
| Tuesday | 76°F | Mostly Sunny | 6 mph NNE | 1% |
| Tuesday Night | 46°F | Partly Cloudy | 3 mph ESE | 13% |
| Wednesday | 76°F | Mostly Sunny | 5 mph SSE | 8% |
| Wednesday Night | 45°F | Mostly Clear | 5 mph SE | 4% |
| Thursday | 79°F | Sunny | 6 mph SSE | 2% |
| Thursday Night | 47°F | Partly Cloudy | 6 mph SE | 3% |
| Friday | 80°F | Mostly Sunny | 8 mph SSE | 1% |
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.