Nope, I started mine the first of February. They took about a week to sprout and they are now healthy little plants. If they haven't sprouted yet, they aren't going to.
Did you remember petunia seeds need light to germinate? You don't cover them, just lightly press them so they are in contact with the soil. But then since they are just sitting there on top, they dry out easily, so they need to be gently sprinkled every day to stay moist until they root in to the soil.
Sorry, that was supposed to be an edit. I went back and looked to see when I planted them and when they sprouted. Didn't mean to duplicate the post.
Lots of my petunias have been potted up and some are out hardening off already.