We have them all over the place here in Maryland.
Maybe you haven't seen any yet cuz the area you live in was developed in the past 17 years? Young trees, or maybe hardly any at all? Any eggs underground since the last emergence would have been destroyed.
Or, maybe your underground temp hasn't reached 64F yet. (Although I find that hard to believe this late in the spring.)
In any event, don't complain. They were interesting for about 3 or 4 days, now they're just a freak show. They have absolutely no navigation skills when they fly so it's quite common to have them hit you from any direction. And don't get me started going on what the kids do with them. YUCK!
If we're lucky our critters will be back in hibernation by the time we return from Hilton Head later this month. Please, please.
Kelley