How to Use Lime to Kill Ticks. They are out already in some areas and I have a feeling this is going to be a bad year for them. Homeguides tells us how to prevent them in the yard. you can use powdered lime per this article.
I have also heard that you can add 3 ounces of tea tree oil to a garden sprayer and spray the whole yard with it. If the tea tree oil runs out be sure to add more until you have covered all areas. I would not use tea tree if you have pets. It can be toxic to cats and dogs
See How to remove them if you find one on you.