Depending the size of your backyard and what it's like, and whether you can hide some buckets (or if you just don't care about having buckets of water sitting around your yard), you could try "mosquito death buckets".
You just fill up some 5 gallon buckets from Home Depot or whatever with 1/2 to 3/4 water, toss some grass clippings/dirt in there to make it feel all at home for the mosquitos, and toss a piece of these in:
Mosquito Dunks
They treat almost 10 square meters for surface water for 30 days...so for a bucket you just need a small piece, and add again after 30 days. It's a bacteria that's kills the mosquito larvae, so you're playing the long-game. Getting the mosquitos to lay their eggs where they'll never develop and reducing the local population more and more with each cycle.