Arco, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Arco, a city in Butte County, Idaho.
Overnight
46°F
Areas Of Smoke
Areas of smoke. Mostly clear. Low around 46, with temperatures rising to around 49 overnight. North wind around 6 mph.
7-day forecast for Arco
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 46°F | Areas Of Smoke | 6 mph N | 0% |
| Tuesday | 84°F | Areas Of Smoke | 3 to 13 mph S | 0% |
| Tuesday Night | 51°F | Areas Of Smoke | 7 to 15 mph WNW | 0% |
| Wednesday | 89°F | Areas Of Smoke | 3 to 13 mph SW | 0% |
| Wednesday Night | 55°F | Mostly Clear | 8 to 15 mph WNW | 0% |
| Thursday | 96°F | Sunny | 2 to 9 mph WNW | 0% |
| Thursday Night | 60°F | Mostly Clear | 6 to 14 mph WNW | 0% |
| Friday | 98°F | Sunny | 3 to 15 mph W | 0% |
| Friday Night | 61°F | Mostly Clear | 9 to 20 mph WNW | 0% |
| Saturday | 97°F | Sunny | 3 to 18 mph W | 0% |
| Saturday Night | 62°F | Mostly Clear | 8 to 21 mph WNW | 0% |
| Sunday | 96°F | Sunny | 5 to 21 mph SSW | 0% |
| Sunday Night | 60°F | Mostly Clear | 7 to 23 mph WNW | 0% |
| Monday | 94°F | Sunny | 5 to 20 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Arco (43.632, -113.301). Updated through the day.
Growing snapshot for Arco
Last spring frost
May 22
First fall frost
Sep 22
Growing season
119 days
Hardiness zone
5a
More local growing data for Arco: nearby ZIP 83255 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Arco, Id (9.6 mi from Arco). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.