I am often asked how to keep cats away from yards. Cats are unpredictable, so there are few sure-fire cat repellents. But below I consider some of the best approaches known to keep cats away from yards. Broadly speaking, we can label all of these diverse approaches as "cat repellents," since they are all designed to repel unwanted feline intruders from a specific area. But I'll also provide an example of the commercial products more narrowly associated with the label, "cat repellents," namely, products that come in a can and are sprinkled on the ground to keep cats away.