Cindy -- yes, you can plant a couple of weeks before the last frost; potatoes like growing in cooler weather.
Shannon -- I've never grown potatoes in containers of any kind myself, but yes, you should be able to do them in a "potato bag." I'd fill it about half full of planting mix, put the seed potatoes a few inches deep, and then fill in with more mix as the plants grow. If the bag is 24" across I would think you could do 4 or 5 plants in it.
Jared and Shannon (and anyone else) -- I'd love to see photos of how your plants do in the containers! (You might want to start a new thread in the "Vegetables and Fruits" forum, I'm sure there would be lots of interest in it there and more people would be likely to see it
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