Ontario, OH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Ontario, a city in Richland County, Ohio.
Tonight
55°F
Partly Cloudy
Partly cloudy, with a low around 55. Northeast wind 5 to 10 mph.
7-day forecast for Ontario
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Partly Cloudy | 5 to 10 mph NE | 1% |
| Saturday | 78°F | Chance Rain Showers | 6 mph SE | 38% |
| Saturday Night | 65°F | Showers And Thunderstorms Likely | 5 to 9 mph S | 71% |
| Sunday | 76°F | Showers And Thunderstorms | 12 mph W | 91% |
| Sunday Night | 56°F | Showers And Thunderstorms Likely | 13 mph NE | 61% |
| Monday | 67°F | Chance Rain Showers | 14 mph NE | 47% |
| Monday Night | 53°F | Chance Rain Showers | 14 mph NE | 47% |
| Tuesday | 67°F | Chance Rain Showers | 14 mph NE | 45% |
| Tuesday Night | 55°F | Rain Showers Likely | 15 mph NE | 55% |
| Wednesday | 67°F | Rain Showers Likely | 12 to 15 mph E | 55% |
| Wednesday Night | 53°F | Chance Rain Showers | 12 mph E | 53% |
| Thursday | 68°F | Chance Rain Showers | 10 mph NE | 28% |
| Thursday Night | 52°F | Slight Chance Rain Showers then Mostly Cloudy | 6 to 9 mph N | 20% |
| Friday | 68°F | Slight Chance Rain Showers | 7 to 12 mph N | 16% |
Forecast source: National Weather Service (api.weather.gov) for Ontario (40.768, -82.615). Updated through the day.
Growing snapshot for Ontario
Last spring frost
Apr 30
First fall frost
Oct 15
Growing season
167 days
Hardiness zone
6a
More local growing data for Ontario: nearby ZIP 44906 weather · frost dates · planting calendar · Ohio frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mansfield 5 W, Oh (2.2 mi from Ontario). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.