Iona, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Iona, a city in Bonneville County, Idaho.
Overnight
47°F
Slight Chance Light Rain
A slight chance of rain. Mostly cloudy. Low around 47, with temperatures rising to around 49 overnight. South southeast wind around 3 mph. Chance of precipitation is 40%.
7-day forecast for Iona
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 47°F | Slight Chance Light Rain | 3 mph SSE | 41% |
| Saturday | 63°F | Chance Light Rain then Slight Chance Showers And Thunderstorms | 3 to 7 mph SSW | 36% |
| Saturday Night | 43°F | Partly Cloudy | 1 to 5 mph S | 6% |
| Sunday | 68°F | Mostly Sunny | 5 mph WSW | 3% |
| Sunday Night | 43°F | Mostly Clear | 5 mph ENE | 0% |
| Monday | 74°F | Sunny | 6 mph NNE | 0% |
| Monday Night | 46°F | Mostly Clear | 5 mph E | 0% |
| Tuesday | 75°F | Mostly Sunny | 6 mph NE | 0% |
| Tuesday Night | 49°F | Partly Cloudy | 3 to 7 mph SE | 13% |
| Wednesday | 76°F | Mostly Sunny | 7 mph SE | 8% |
| Wednesday Night | 48°F | Mostly Clear | 3 to 8 mph SSE | 2% |
| Thursday | 79°F | Sunny | 7 mph SSW | 2% |
| Thursday Night | 51°F | Partly Cloudy | 5 to 9 mph SSE | 1% |
| Friday | 79°F | Mostly Sunny | 9 mph SSE | 1% |
Forecast source: National Weather Service (api.weather.gov) for Iona (43.528, -111.931). Updated through the day.
Growing snapshot for Iona
Last spring frost
May 9
First fall frost
Oct 1
Growing season
142 days
Hardiness zone
5b
More local growing data for Iona: nearby ZIP 83401 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Idaho Falls - Kifi, Id (7 mi from Iona). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.