Trash/recycling not allowed here, Mike. I was surprised when the trashman fished mine out of the trash and recycle bin and placed it back at my door with a note. It might be a Colorado thing, but there's a $10 disposal fee each here at a tire shop (maybe slightly different costs at the County landfill). Naturally, I found this out AFTER having a handful of other's tires on hand from changes I'd done for others for free (I now require that the old tire must leave with the motorcyclist for whom I've changed the tire.)
Catdriver, best thing to do is to call and ask your local trash service if they accept them in the trash or recycling. If not, find a shop that will accept them (expect to pay a fee).