Ontario, OH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Ontario, a city in Richland County, Ohio.
Today
83°F
Sunny
Sunny, with a high near 83. East wind around 2 mph.
7-day forecast for Ontario
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Sunny | 2 mph E | 0% |
| Tonight | 62°F | Mostly Clear | 3 mph E | 0% |
| Wednesday | 85°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph S | 31% |
| Wednesday Night | 65°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 mph SW | 24% |
| Thursday | 84°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 9 mph SW | 49% |
| Thursday Night | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 7 mph SW | 59% |
| Friday | 82°F | Showers And Thunderstorms Likely | 8 mph SW | 68% |
| Friday Night | 64°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 6 mph SW | 68% |
| Saturday | 83°F | Chance Showers And Thunderstorms | 8 mph SW | 30% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms | 7 mph SW | 30% |
| Sunday | 85°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 7 to 12 mph SW | 18% |
| Sunday Night | 67°F | Chance Showers And Thunderstorms | 10 mph SW | 33% |
| Monday | 85°F | Chance Rain Showers | 12 mph SW | 38% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 8 to 12 mph SW | 46% |
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 Aug 4, 2026.