Plus, there's the migration season to think about in some areas. Here, the red-tailed hawks are the biggest problem. We're at the edge of the range where they can over winter and we do occasionally see some in the winter. We get large numbers going through in spring and fall. That's when attacks are most likely here.
The migrating hawks may just fly through or may stop to take advantage of a meal that's out in the open. They're really hungry, don't have all day to hunt and they need to stop for water, anyway. The "locals" seem to find enough food in their usual hunting areas and are familiar with our dogs, one in particular that dislikes hawks. Maddie will go after a hawk, chase one that flies low and harass one that is sitting in a tree, jumping up, barking and trying to climb up there.