Rinse the green onions well, then pat dry with a paper towel or clean, lint-free dish towel.
Slice the green onions.
Place the sliced green onions in a jar, freezer bag, or other air-tight, freezer safe container. Close the container tightly to prevent air flow.
Freeze the green onions for 3-4 months. To use, simply sprinkle the frozen green onions over your meal. The green onions will thaw within seconds and be ready to eat.