You can find out where the USDA graded eggs you buy are packed. The day of the year that the eggs are processed and placed into the carton must also be shown on each carton with the USDA grade shield. The number is a three-digit code that represents the consecutive day of the year. Typically, eggs are packed within 1 to 7 days of being laid. If your carton shows a USDA grade shield, you can determine the date that the eggs were packed from the carton date code.
Most States require the use of a pack date as described above.
For more information about State egg laws, contact your local State Department of Agriculture.