The rut is usually considered to be about the third week in Sept. For years this is the week we chose to hunt in Ontario. A lot depends on the weather, however. If it is warm there likely will not be too much activity.
I have also hunted in mid-October and still had bulls responding well to the call. You might want to look into the average or normal weather conditions found in the area where you plan to hunt and adjust your choice based on that.
Jim
