Keeping your green card valid and current is an important and urgent matter. An expired green card requires immediate renewal, so that you can maintain your permanent residency in the United States and avoid charges of misdemeanor. You may find out your green card’s expiration date from the front of the card. It is highly recommended that you submit your application to renew your green card if it will expire in 6 months’ time, although you may also start the renewal process even upon discovering your already expired green card. Also, you have to ensure that you have obtained the latest version and official name of your US Permanent Resident Card, as several versions have emerged over the years.