Does anyone know how to keep cats out of my yard? Like is there something I can sprinkle on the ground? Pepper? Mothballs?
How big an area? Is it annoyance factor, digging/pooping? My sister has neighborhood cats using her front planter as a litter box. She laid down some chicken wire and they seem to have moved on. My brother has a very small back yard and cats were digging in his raised beds so he put up a motion activated sprinkler (there are also motion activated alarms). I wouldn't put anything down that the chickens or dogs might get a hold of (like mothballs).
You could trap them and turn them in.
Dogs keep the cats out of our yard, so I've never had to worry. You can borrow Scooter!

(Scooter wants to know how much he has to pay you to get to chase cats in your yard.)