Knowing how to freeze sweet corn is especially handy if you want to stock up on corn when it’s on sale during the summer, or if you grow it yourself and wind up with more than you can eat fresh off the cob You want the corn silk (the fibers sticking out of the top of the husk) to be brown and sticky. If they’re black or dried out, it’s an old ear of corn. The corn silk should also smell sweet and fragrant. Feel the corn kernels through the husk. Make sure they feel plump and that there aren’t a lot missing. The husk itself should be bright green in color and wrapped tightly around the cob. If the husk is yellowing or super dry, don’t buy it. Blanching prolongs the shelf life of frozen corn as well as preserving the flavor and texture. However, you can freeze raw corn (on or off the cob) without blanching if desired.