Polymerous - growing hostas in your zone will likely be more challenging than in colder zones. Hostas need a good dormancy period. And during the growing season, they also need quite a lot of water. If they don't get enough water during the growing season, they may well be ill-prepared to survive the winter. Your irrigation system should help take care of that, but it may still be an issue. But as Rose said, hosta vary widely in when they actually show up; so don't give up hope yet.
