Commercially prepared or packaged bread crumbs in the United States will often be usable/edible, even after the "best by" quality date on the packaging, provided they were properly stored in undamaged packaging.
Storage time advice varies, but the most conservative and safe timeline for pantry or cabinet storage is six months, with fridges and freezers possibly lasting a year or more.
If freezing, use containers that are airtight and covered, or make use of heavy-duty style freezer bags. Deep freezing is best done at a consistent zero degrees Fahrenheit for maximum preservation.
Even if bread crumbs remain safe and edible, their color, flavor and texture may change, so their impact on certain recipes will differ depending on when you use them.
Any time stored bread crumbs emit any kind of odor, look or flavor that seems "off" to your senses, dispose of them due to deteriorating quality. If you ever see mold, throw the entire lot out at once.