Step 1: Bring a large pot of cold water to a boil over high heat. You can cover the pot with a lid to hasten the boiling process.
Step 2: Drop fiddleheads in the boiling water and wait for the water to come back to a boil. Boil them for two minutes.
Step 3: Drain the fiddleheads in a colander, then transfer them to the bowl of ice water. Let them soak in the ice water for a minute or so.
Step 4: Transfer the fiddleheads using a slotted spoon to a clean kitchen towel or paper towels. Pat them dry. Transfer them to freezer-safe containers or bags and freeze.