My yard doesn't usually get mushrooms popping up but my yard is usually really dry and mushrooms like a good bit of moisture to grow. By the time it rains here it's also gotten colder. If it gets too cold mushrooms don't like that either. In southeast Texas in the piney woods area the moisture is much better mushroom growing. the rains are more frequent and the temperatures usually milder. Of course there are those people who water their yards so much that it seems like a nice long rain has occurred. In that case you can spot the occasional mushroom sprouting up here and there right in the middle of an otherwise well kept yard.