The 5-Second Trick To Keep Guacamole From Turning Brown

Guacamole is delicious, but keeping it green and fresh after the first scoop can feel like a losing battle. You make a big batch, serve it proudly, and the next day? It’s turned an unappetizing shade of brown.

Don’t worry, you’re not alone. Like avocados themselves, guacamole is prone to oxidation once it hits the air. Luckily, I’ve picked up a few tricks that actually work to keep it looking and tasting great for longer, and you probably already have what you need in your kitchen.

Why Citrus Helps Keep Guacamole Green

Guacamole browns because oxygen reacts with enzymes in the avocado. But citrus, especially lemon or lime juice, is full of ascorbic acid (vitamin C), which acts as a natural preservative. That’s why almost every guacamole recipe calls for lime. It doesn’t just taste good; it also helps the dip keep its color. The oxygen reacts with the ascorbic acid before the avocado itself, according to the California Avocado Commission.

So if you’re storing leftover guacamole, make sure it has enough lime or lemon juice mixed in—and add a little extra on top before sealing it up.

How to Store Guacamole So It Stays Green

Once your guacamole is made, press a piece of plastic wrap directly onto the surface of the dip to block out air. Or better yet, store your guac in an airtight container, flatten top with a spoon or knife until the surface is even, then squeeze a little citrus juice across the top before sealing. Some people even swear by adding a thin layer of water on top to create an oxygen barrier—just pour it off and stir before serving.

However you choose to store it, keep guacamole in the fridge and enjoy it within a day or two. The citrus will help delay browning, but won’t stop it completely. So trust your eyes and nose before digging back in.