Typically, in Ontario grains are planted in the spring (between April and June) and are harvested in the fall (between September and November). That being said, different variables like weather, where a farm is located in Ontario and even the grain type can impact the “typical” growing season.
For example, wheat can be planted either in the fall or spring. Winter wheat is wheat planted in the fall after soybean harvest (September – November) and hibernates over winter where it begins to grow again in the spring. Winter wheat can be harvested as early as July in some parts of the province!