Hartley, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hartley, a city in O'brien County, Iowa.
Overnight
62°F
Chance Rain Showers
A chance of rain showers and patchy smoke. Mostly cloudy, with a low around 62. North wind around 15 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Hartley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 62°F | Chance Rain Showers | 15 mph N | 51% |
| Tuesday | 73°F | Chance Rain Showers | 5 to 15 mph N | 44% |
| Tuesday Night | 53°F | Patchy Smoke then Mostly Cloudy | 0 to 5 mph NW | 48% |
| Wednesday | 75°F | Mostly Sunny | 0 to 5 mph E | 1% |
| Wednesday Night | 52°F | Mostly Clear | 5 mph SSE | 0% |
| Thursday | 82°F | Sunny | 5 to 10 mph S | 0% |
| Thursday Night | 60°F | Mostly Clear | 10 mph S | 4% |
| Friday | 86°F | Sunny | 10 to 15 mph SSW | 5% |
| Friday Night | 64°F | Mostly Clear | 5 to 15 mph S | 13% |
| Saturday | 89°F | Sunny | 5 to 15 mph S | 7% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 15 to 20 mph ESE | 21% |
| Sunday | 87°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph SE | 21% |
| Sunday Night | 67°F | Partly Cloudy then Chance Showers And Thunderstorms | 10 to 15 mph ESE | 26% |
| Monday | 86°F | Chance Showers And Thunderstorms then Mostly Sunny | 15 mph E | 26% |
Forecast source: National Weather Service (api.weather.gov) for Hartley (43.179, -95.477). Updated through the day.
Growing snapshot for Hartley
Last spring frost
May 1
First fall frost
Oct 7
Growing season
160 days
Hardiness zone
5a
More local growing data for Hartley: nearby ZIP 51346 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Sanborn, Ia (10.4 mi from Hartley). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.