Diced green, sweet red and yellow peppers can be frozen without blanching, so there’s no need to put them in boiling water for a short time. Simply wash and dry the peppers, remove the stems and seeds and chop as desired. Pack into freezer bags, containers or canning jars. Be sure to label and date each package. The peppers will keep in your freezer for 3 to 6 months. When a cooked dish calls for diced peppers, you can use them directly from the freezer.