It is generally safe to eat spaghetti sauce after the expiration date. However, it may not taste as fresh as it did when it was first made. If the sauce has been stored in a cool, dark place, it will probably taste fine. However, if it has been stored in a warm, sunny place, it may not be as good.yes, spaghetti sauce is typically fine to use after the expiration date. The sauce will usually remain safe to eat after the expiration date, but the quality will start to decline. After the expiration date, the sauce may develop an off flavor or become more acidic. However, if the sauce is stored properly, it should still be safe to eat.