One way to protect your yard from mosquitoes is to eliminate any standing water sources, as these provide breeding grounds for the pests. This includes emptying out bird baths, buckets, and any other containers that can collect water. You can also consider using mosquito-repellent plants like lavender, citronella, or marigolds to help deter mosquitoes from entering your yard. Additionally, installing screens on windows and doors can prevent mosquitoes from entering your home and yard.