Goldwing is correct. You can find this information at:
http://www.gates.com/part_locator/index.cfm?location_id=3598
If you follow instructions, you will eventually get a table that tells you it is an interference engine that uses a timing belt. Your owner’s manual has the information in the maintenance section. I would guess it’s somewhere around 90,000 miles. If you don’t have your owner’s manual, check the Kia web site. The manuals are often available for download.