The answer is no, without a small-print exception
Cats should not eat grapes. The fruit is firmly established as a cause of acute kidney injury in dogs, where even a small number has, in some animals, led to kidney failure. Documented cat cases are rarer — partly because most cats show little interest in sweet fruit — but rarity is not safety: there is no known safe amount, no way to predict which animal will react, and no nutritional reason to run the experiment. Raisins, sultanas, and currants are the same fruit concentrated, and the same rule covers all of them.
How grape trouble would show itself
Kidney injury does not announce itself clearly at first, which is why waiting for symptoms is the wrong plan. Early signs after eating grapes can include vomiting, unusual tiredness, loss of appetite, and drinking or urinating differently from normal; a cat who stops urinating or becomes weak and withdrawn is in serious trouble. Because cats hide illness well, a known grape ingestion should trigger a call to your vet or a poison helpline straight away, while the cat still looks fine — early treatment is what changes outcomes, and your vet may want to examine her, run blood tests, and monitor kidney values over the following days.
Why cats meet grapes more often than you'd think
The risk in most homes is not deliberate feeding but play. A grape that rolls off a counter is a perfect cat toy — round, fast, and bite-sized — and a cat who chases one down may puncture or swallow it. Fruit bowls left on low tables, grapes packed in lunchboxes set down open, and raisins spilled from baking or trail mix are the usual routes. Store grapes and raisins in the fridge or a closed container, sweep spills promptly, and give curious cats a proper toy to chase so the rolling green ball never becomes the game. Children should be told plainly that grapes are a people-only food, never a sharing treat for the cat.
What to do if your cat eats one
Note roughly how many were eaten and when, keep the packaging or a sample of the fruit if it came from a mixed pack, and call your vet immediately — outside hours, use the emergency clinic or an animal poison line rather than waiting until morning. Do not try to make your cat vomit at home unless a vet specifically instructs you to; home methods can do more harm than the fruit. Follow the vet's plan exactly, even if it involves monitoring a cat who seems perfectly well, because kidney values can shift after the animal still looks normal. Grapes deserve the same household status as cleaning chemicals: stored high, closed away, and never treated as a toy, because the cats most at risk are not the ones begging at the table but the playful ones batting fallen fruit across a kitchen floor at midnight.
Making the never-feed list visible
Grape accidents often happen because one person in the house never heard the rule. KinsLe's Care Teams fixes that by putting grapes on a written never-feed note attached to your cat's care duties, visible to every family member and helper who feeds her.