The answer to 'how to prevent fire ant' is to use a combination of chemical and non-chemical methods. Start by removing any food sources and eliminating moisture around your home, as fire ants are attracted to these. You can then treat the area with a fire ant bait or contact insecticide, following the instructions on the product label carefully. It's important to reapply the treatment every 4-6 weeks during the active season to maintain control.
For larger infestations or hard-to-reach areas, it's best to call in a professional pest control technician. They have access to more powerful treatments and can develop a customized plan to effectively eliminate the fire ant problem on your property.