According to Official Guinness Records,
The largest golf tee measured 9.37 m (30 ft 9 in) long with a head diameter of 1.91 m (6 ft 3 in) and a shaft width of 64 cm (2 ft 1 in). The golf tee was made by Jim Bolin (USA) and was presented and measured in Casey, Illinois, USA, on 29 January 2013.
The golf tee was made out of yellow pine boards, that were first glued together to form a large block out of which the tee was shaped using chainsaws.Read more: Big Things in a Small Town - US businessman gets Casey into record books with eight giant inventions
For a complete list of 2013 records, please visit 2013 Guinness Records in United States.