Hartley, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hartley, a city in O'brien County, Iowa.
Tonight
40°F
Rain Showers
Rain showers. Cloudy, with a low around 40. Northwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Hartley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 40°F | Rain Showers | 15 to 20 mph NW | 95% |
| Wednesday | 46°F | Rain Showers | 15 to 20 mph WNW | 91% |
| Wednesday Night | 37°F | Rain Showers Likely | 15 mph NW | 62% |
| Thursday | 46°F | Chance Rain Showers then Mostly Cloudy | 15 mph NNW | 32% |
| Thursday Night | 32°F | Mostly Cloudy | 5 to 10 mph N | 2% |
| Friday | 47°F | Partly Sunny | 5 mph NNE | 0% |
| Friday Night | 30°F | Mostly Cloudy | 0 to 5 mph SSE | 0% |
| Saturday | 54°F | Mostly Sunny | 0 to 10 mph SW | 2% |
| Saturday Night | 34°F | Mostly Clear | 5 mph W | 4% |
| Sunday | 58°F | Sunny | 5 to 10 mph WSW | 3% |
| Sunday Night | 37°F | Mostly Clear | 5 to 10 mph SSW | 1% |
| Monday | 60°F | Sunny | 10 to 15 mph WSW | 0% |
| Monday Night | 37°F | Mostly Clear | 5 to 10 mph NW | 0% |
| Tuesday | 57°F | Mostly Sunny | 5 to 10 mph W | 1% |
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 Nov 4, 2026.