I suppose you could, but they do lose their structure and so might be harder to handle once frozen and thawed.

I do freeze jalapenos whole, but because bells are larger I slice them first to save space in the freezer.

I freeze them whole but with the stem end cut off and deseeded for stuffed peppers but I stuff them before I freeze them. As Kate mentioned they are pretty limp and slimy after thawing.

I seed them, cut in quarters, and chop with my Vidalia onion chopper using the large chopper section. I then froze them on a half sheet so they wouldn't stick together. After they were froze, I put them in gallon zip lock freezer bags. I had peppers until January. Since I had green, red, and yellow they were so pretty. My peppers didn't do well this year and I hated having to buy peppers. They aren't good in salads, but anything you cook they were just the same.

As the posters mention above, the peppers do lose their structure a bit when frozen. I've had really good results chopping them up in small (snack) bags, then layering in a larger freezer bag. Taste doesn't seem to be an issue but it's really handy to pull out a serving-size bag and throw into sauce or soup as is. Lori

I also freeze them whole, deseeded and with the tops cut off. If I'm careful, I can "stack" three or four together to save freezer room, then I stuff them while frozen and bake them, otherwise they just kind of.......collapse, and that makes them harder to stuff. Others get sliced or diced, and small bags get stored inside a big bag, like gardengal does. That way I can just grab a bag and dump it into the soup pot or whatever.

Annie