I live in east-central Alabama, and since Feb. 20 or so, small trees with conspicuous white flowers have been in full bloom along rural roadsides around here. No foliage has appeared. Can they be "wild" Bradford pears?
Bradford pear trees
Sure could be. Callery Pear or Pyrus calleryana (of which 'Bradford' is but one named selection) can readily seed itself in. It has been named an invasive species in more than a few places, just for this reason.
Photos would help aid the ID.