Hello! You can keep them in a cool, dry place for up to 2 months about 40 to 50 degrees F. If they are too warn, they may go moldy or sprout. Or you can keep them in the refrigerator. Put them in a plastic container, with a tightly sealed lid. If you don't want it to smell like onions and ruin your Tupperware (for example) use a large 1 quart yogurt container with lid.

When they are sliced open for use, I keep them in the refridgerator for a couple weeks in a plastic container.

http://startcooking.com/public/images/IMGP9552.JPG

Here's a lengthy article too.

http://startcooking.com/blog/63/How-to-Buy-and-Store-Onions

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