The ultrasonic sound cat deterrent is recommended by the RSPB. It’s effective between 22-46% of the time and is therefore moderately effective in deterring indoor/outdoor cats from coming into your garden. If they get past the barrier of high-pitched sound, … 
Fortunately, we have two independent studies on the topic as to whether ultrasonic cat deterrent devices (‘cat repellers’) work and therefore I able to provide a fairly definitive answer to the question in the title. Before I do it’s come …
There are many people who want to keep neighbours’ cats out of their backyard and there are many methods, some of which will fail. I like these two methods and I will recommend them as a starting point because they …
