1. Bring a large pot of water to a boil over high heat. Cut corn kernels from cobs. Drop kernels in boiling water and cook 1 minute. Drain kernels well.
2. Transfer corn kernels to rimmed baking sheets, spreading out evenly. Cover each sheet with parchment paper (to prevent sticking) and stack in freezer.
3. Freeze corn completely, about 2 hours. Scrape kernels loose from baking sheets with a rigid spatula. Divide into resealable plastic freezer bags or other airtight containers and return to freezer.
Note: Nutritional analysis is per 1/2 cup.