Select a firm, fresh cauliflower head with tightly packed, vibrant florets. Avoid any with spots, blemishes, or loose florets.
Wash your cauliflower thoroughly under cold water. Pat it dry, remove the leaves, and cut it into evenly-sized florets.
Blanch the cauliflower. Bring a large pot of water to a boil. Add the cauliflower florets and boil for about 3 minutes. Then, transfer the florets to a bowl of ice water for another 3 minutes.
After the ice bath, drain the florets well and pat them dry with a clean kitchen towel.
Lay the dried cauliflower florets on a baking sheet lined with parchment paper in a single layer. Freeze them until fully frozen (about 1-2 hours).
Transfer the frozen florets into freezer-safe bags or containers. Press out as much air as possible before sealing.
Label and date your bags or containers. Your frozen cauliflower is best used within 6 to 8 months for optimum quality.