Firth, ID Weather & Growing Conditions
Today
72°F
Sunny then Patchy Smoke
Patchy smoke after noon. Sunny, with a high near 72. Southwest wind 6 to 14 mph, with gusts as high as 20 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Sunny then Patchy Smoke | 6 to 14 mph SW | 0% |
| Tonight | 48°F | Areas Of Smoke | 9 to 14 mph SW | 0% |
| Wednesday | 76°F | Areas Of Smoke | 8 to 13 mph SW | 0% |
| Wednesday Night | 51°F | Mostly Clear | 8 to 14 mph S | 0% |
| Thursday | 81°F | Sunny | 9 to 14 mph SSW | 0% |
| Thursday Night | 56°F | Mostly Clear | 14 mph SSW | 0% |
| Friday | 85°F | Sunny | 9 to 15 mph SSW | 0% |
| Friday Night | 59°F | Mostly Clear | 9 to 18 mph SSW | 0% |
| Saturday | 85°F | Sunny | 7 to 16 mph S | 0% |
| Saturday Night | 61°F | Mostly Clear | 9 to 17 mph SSW | 0% |
| Sunday | 83°F | Sunny | 8 to 18 mph SW | 0% |
| Sunday Night | 60°F | Mostly Clear | 9 to 21 mph SSW | 1% |
| Monday | 82°F | Sunny | 9 to 16 mph SSW | 1% |
| Monday Night | 59°F | Partly Cloudy | 12 to 17 mph SSW | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Firth, ID
Last spring frost
Jun 9
First fall frost
Sep 11
Growing season
93 days
Hardiness zone
5b
Explore more for Firth, ID: full frost dates · planting calendar · Idaho frost dates
Climate data from the nearest NOAA station, Idaho Falls 16 Se, Id (11.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.