How to Make Chicken Stock from Frozen Chicken Bones

Frozen chicken bones can go straight into the pot. No thawing. Blanch them, cover with fresh cold water, bring it up, skim, then simmer two to three hours on the stove or cook about 45 minutes at high pressure. Strain, portion, chill fast. That is the whole method, and the freezer is what makes weeknight stock possible at all.

Why stock bones can skip the thaw

The reason you thaw meat fully is that a frozen core can leave the middle undercooked while the outside looks done.¹ A stockpot removes that risk with time. The bones spend hours at a full simmer, so every part of them cooks through many times over. That reasoning is ours, not SFA’s; their rule is written for meat you serve as a piece, and it still stands for anything you plan to eat that way.

The one real cost of starting frozen: the pot takes longer to come up to a boil. Budget an extra fifteen minutes and start skimming when the surface does.

Which bones to use

Any chicken bone makes stock, but they pull in different directions. Carcasses and backs give a clean everyday broth. Feet and wing tips carry the most collagen, so a handful in the pot gives stock that sets to a wobble in the chiller, which is the sign of real body. Necks bring flavour out of proportion to their size.

A 1kg bag straight from the freezer suits a family stockpot. If you want a milky, rich soup base for noodles, boil hard for the last half hour instead of holding a bare simmer; the rolling boil works the fat into the broth rather than leaving it on top.

Blanch first: five minutes for a clear stock

1. Put the frozen bones in the pot and cover them with cold tap water.
2. Bring it to a hard boil and keep it there for five minutes. The water turns grey and foamy. That is the point.
3. Pour everything off, rinse the bones under the tap, and wipe the pot clean.
4. Refill with fresh cold water and start the stock proper.

Blanching from frozen works fine; the bones only add a few minutes on the way to the boil. The scum you pour away is what would have clouded the stock and muddied the taste.

Stovetop stock: two to three hours

1. Cover the blanched bones with two to three litres of water per kilo of bones.
2. Add aromatics if you like: a few slices of ginger, a spring onion, a small handful of white peppercorns. Keep salt out. Season the dish later, not the stock.
3. Bring it to a boil, then drop to a bare simmer with slow, lazy bubbles.
4. Skim in the first twenty minutes, then leave it alone.
5. Two hours gives a clean everyday stock. Three gives more body. Top up with hot water if the bones start to peek out.
6. Strain through a sieve and discard the bones. They have given everything they have.

Pressure cooker stock: about an hour

1. Blanched bones in, water to cover, staying under the cooker’s max line.
2. Seal and cook 45 minutes to an hour at high pressure.
3. Let the pressure release naturally. A fast release boils the pot hard and clouds the stock.
4. Strain. The result is deeper than two hours on the stove, for a fraction of the watching.

Store it in portions you actually use

Split the strained stock into small containers: 250ml for a sauce or one bowl of noodles, 500ml for a family soup. Small portions cool faster, thaw faster, and mean you never thaw a whole tub for one bowl.

Then get it cold quickly. Bacteria grow fastest between 5°C and 60°C,² and SFA says food not eaten straight away should be quickly refrigerated at 4°C or lower.³ A big pot left on the stove to cool spends hours inside that band.

• Sit the containers in a sink of tap water with a few ice packs, move them around now and then, then straight into the chiller.
• Use chiller stock within a few days.
• For the long keep, freeze it. SFA’s storage table puts freezers at -18°C or below,⁴ and flat bags stack neatly and thaw fastest.
• Label with the date. Frozen stock all looks the same during a late-night noodle craving.

One kilo of bones turns into roughly two litres of stock for about ten minutes of real work. Keep a bag in the freezer and stock stops being a project.⁵

1. Singapore Food Agency, Guidelines on Thawing of Food (updated 27 Sep 2024, p. 1): “Thaw food thoroughly before cooking. Frozen or partially frozen food will require longer cooking time. The external surfaces of this food could be cooked, but the inner portion might remain uncooked and harmful bacteria within the food may not be killed.” sfa.gov.sg (PDF) ↩︎
2. Singapore Food Agency, Temperature Control in Cooked Food: “5°C-60°C is known as the "temperature danger zone", the range of temperature ideal for bacterial growth.” sfa.gov.sg ↩︎
3. Singapore Food Agency, same guidance: “For food not meant for immediate consumption, quickly refrigerate at 4°C or lower, or keep it warm at 60°C or higher.” A pot left on the stove to cool sits in that range the whole way down. sfa.gov.sg ↩︎
4. Singapore Food Agency, Food Safety Tips, storage temperature table: “Freezers -18°C or below”, alongside “Fridges and chillers 4°C and below”. sfa.gov.sg ↩︎
5. The bones this stock starts from, bagged frozen: our chicken bones selection. ↩︎