I freeze quickbreads (and yeast breads for that matter) all the time. Muffins I toss in plastic zipper baggies. Loaves I wrap in plastic wrap and then in foil and then I put in a freezer bag. The advantage to pre-slicing is that you can grab just a slice or 2 to defrost or toast or whatever without having to take out the whole loaf at once.
Sometimes the texture changes a bit and getscrumbly, but I also use whole grain flours and make other changes, so that may contribute to some of the texture issues. You can freeze for a long time. I've frozen loaves in the deep freezer for at least a year without a problem but YMMV.
Sometimes the texture changes a bit and getscrumbly, but I also use whole grain flours and make other changes, so that may contribute to some of the texture issues. You can freeze for a long time. I've frozen loaves in the deep freezer for at least a year without a problem but YMMV.