This is the first year in 6 at this house in Temple we HAVE NOT been troubled with fire ants in both our front and side yards. I was just commenting to my husband on that fact a couple days ago and wondered if the horrific freeze didn't kill them off. I react soooooooo badly to all insect stings, too, I'm very aware of their presence or lack therof.
There are so many ant hills and fire ants down at our 42 acre cabin rural property in Gause (near Bryan/CS) we don't bother to treat anything there but the largest of ant mounds. I was hoping any moles liked ants, but apparently not.
I spread diatomaceous earth heavily in the fenced yard area around the cabin our first year to own the place and onto the biggest of the mounds we could find, but it didn't make a dent in them. Sticker burs are almost as bad there. Now, I just make sure I wear my rubber boots at all times in that yard to fend off both problems.