It will take almost four months to replace departing councillor Rick Paltridge on Wattle Range Council.
The Penola grazier resigned as a Riddoch Ward representative with immediate effect on August 3 after almost three years in office.
The August monthly council meeting was held in Millicent a week later with council chief executive Ben Gower explaining the postal ballot to replace Mr Paltridge will be conducted by the Electoral Commission of South Australia at an approximate cost of $15,000.
ECOSA has now announced key dates for the by-election with the voters roll for Riddoch Ward closing on August 31.
Nominations will be accepted from September 23 until October 7. The period of postal voting will run until November 15.
Once known, the successful candidate will be required to take the oath of office before a Justice of the Peace.
The next four-yearly election across SA will be held in October/November of next year.
There are also set to be State and Federal elections in 2022.