Replace a cutting board when the knife grooves are deep enough to hold food or stains after a good scrub, or when it cracks, splits, or warps so it rocks on the counter. USDA says boards that are excessively worn or have hard-to-clean grooves should be discarded. There's no expiry date; condition decides.
How fast you get there depends on the board. A thin plastic board that you use every day for raw chicken will be done long before a thick maple board that mostly sees bread and onions. A good wooden board can often be sanded back to a smooth surface. A cheap plastic one usually can't.
The fingernail test#
Wash and dry the board, then look at it under a bright light at a low angle. Run a fingernail across the most-used area, usually the center, where most of the chopping happens.
If your nail catches in grooves, or you can see dark lines of food or stain sitting in the cuts after washing, the surface is past the point of easy cleaning. That's the whole idea behind the replacement advice: scored surfaces are hard to get clean, and whatever stays in the grooves can transfer to the next food you cut. The FDA Food Code sets the same standard for restaurants: a scratched and scored board has to be resurfaced once it can't be effectively cleaned and sanitized, or thrown out if it can't be resurfaced.
Signs to replace, by material#
| Material |
Replace when you see |
Can you fix it? |
| Plastic |
Deep, fuzzy grooves; stains that sit inside cuts; warping; cracks |
Not practically. Replace it. |
| Solid hardwood (maple, walnut, cherry) |
Cracks that go through, split glue seams, deep gouges, mold in cracks, a smell that survives washing |
Often. Sand out surface grooves and re-oil. |
| Bamboo |
Splitting strips, separated layers, fraying edges |
Rarely. Light sanding only. |
| Glass, marble, ceramic |
Chips or cracks |
No. They also dull knives, so consider retiring them anyway. |
A few things that are not, on their own, reasons to replace a board: light surface scratches you can't feel, a uniform color change on a plastic board, or a wooden board that looks pale and dry. That last one just needs oil.
Can you sand a cutting board instead of replacing it?#
A solid wood board, yes. John Boos, which makes wooden butcher blocks, suggests sanding with 200-grit sandpaper, always with the grain, then re-oiling. For deeper knife scars, start with a coarser grit and work up to the fine one. Wipe off the dust, oil it with food-grade mineral oil, and let it soak in before using it again.
Sanding stops making sense when the board gets too thin to sit flat, or when the damage is a crack or a split seam. Sanding a crack only makes it smoother, and food and water still get into it. An end-grain board with a failing glue joint is done.
Plastic boards are a different story. A home sander on a thin plastic board mostly raises fuzz, and you can't oil plastic afterward. Buy a new one.
Plastic vs wood: which lasts longer?#
USDA says you can use either wood or a nonporous material like plastic, and that nonporous surfaces are easier to clean. Plastic boards can go in the dishwasher, which is their big advantage, but they score quickly, and thin ones can warp in a hot drying cycle.
Wood holds up longer if you look after it, because you can sand it. The dishwasher is where wood gets into trouble. USDA says solid wood boards can be washed in one but laminated boards may crack and split, and board makers like Boos go further and say no wood board is dishwasher safe. Hand washing is the safer bet. Bamboo is harder and less porous than most hardwoods and resists knife scarring, according to USDA, but it's made of strips glued together, so once the strips start separating, it's finished.
The practical answer for most kitchens: a plastic board for raw meat, poultry, and seafood that goes in the dishwasher and gets replaced when it's scored, plus a wooden board for everything else that you maintain and sand.
How many cutting boards should you have?#
At least two. USDA recommends one board for fresh produce and bread and a separate one for raw meat, poultry, and seafood, so juices from raw meat never touch food that won't be cooked. Different colors make this foolproof in a shared kitchen. If you can't tell your boards apart, you'll end up using whichever one is clean.
Replace them separately. The raw-meat board usually wears out first because it's washed hardest and most often.
Keep the board you have in shape longer#
- Wash it with hot, soapy water after each use, rinse, and dry it. USDA's cleaning guidance is the same for wood and plastic.
- Sanitize after raw meat with 1 tablespoon of unscented liquid chlorine bleach per gallon of water. Flood the surface, let it stand several minutes, rinse, and air dry.
- Dry wooden boards on edge so both faces get air.
- Oil wood when it looks dry and pale.
- Don't use the board as a trivet for hot pans. Scorches and heat cracks are permanent.
For the full washing and oiling routine, see how to clean a wooden cutting board. And check the sponge or brush you wash the board with; an old sponge puts back what you just scrubbed off. If your plastic boards go through the dishwasher, the machine's filter needs cleaning too.