I think Halloween is a great time to be doing outdoor decorations. One of the things you could do this season is really decorate your own property and front door. Then stick a Halloween decoration yard sign in your front lawn along with many other yards in your area. It would be really quick and easy to do and a great way to get the word out about your outdoor Halloween decoration business. Such a service is a great extension for your lawn care business especially in the fall when business starts to slow down.
In fact why not have a community decoration contest? That would get a lot more people involved. Take pictures of homes in your area and post them on your lawn care business website. Then on Halloween, choose a winner and present the homeowner with some kind of award.
You could also make some kind of offer on the back of your lawn sign like “Call us and get a free pumpkin.”
Maybe you could have some small pumpkins you give out just to get people to call so you can meet them and talk to them about their outdoor Halloween decoration and lawn care needs.