Finally, place your yogurt bark in the freezer and set a timer for 3 hours. Keep the yogurt bark uncovered so as not to ruin the appearance of the bark. Check your bark after 3 hours to see if it’s firmed up. Depending on the yogurt fat content, this may take longer. Once it’s firm, remove it from the freezer, slice into bars. Store in an air-tight container or gallon ziplock bags. PRO TIP: Try not to leave your yogurt bark uncovered for longer than 24 hours. This will help to avoid freezer burn.