Yes, you can make pineapple mango salsa up to 1 day in advance! It's recommended to let the salsa chill in the refrigerator for at least 30 minutes before serving. This allows the flavors to meld together. Keep it stored it in an airtight container in the refrigerator until you're ready to serve it. Keep in mind that the longer the salsa sits, the softer the texture of the fruit may become. It's best to serve it within 1-2 days of making it. Just give it a quick stir before serving to redistribute the ingredients and you're good to go!