According to Official Guinness Records,
The largest garden gnome measures 7.91 m (25 ft 11 in) tall and was created by Ron Hale (Canada). It was built in 1998, but was measured for the record on 19 August 2009.
The gnome was part of an amusement park that no longer exists. It is currently standing on the grounds of a petrol station. The gnome’s maintenance is a condition of sale for the land deeds for the property, giving it legal protection and assuring that it will remain as a permanent fixture.
For a complete list of 2009 records, please visit 2009 Guinness Records in Canada.