Tennessee Code Title 2. Elections § 2-6-102

(a)(1) A voter who desires to vote early shall go to the county election commission office or another polling place appropriately designated by the county election commission within the posted hours not more than twenty (20) days nor less than five (5) days before the day of the election. A voter desiring to vote in the early voting period shall sign an application for a ballot.

(2) The state coordinator shall supply or approve the form of the application for a ballot.

(b)(1) Except as provided in subdivision (b)(2), in the case of a regular or special general election not held in conjunction with the regular August or November general elections, or held in conjunction with the May primary called pursuant to § 2-13-203 or the presidential preference primary, if there is no opposition for any of the offices involved, including any write-in candidate that has filed the appropriate notice pursuant to § 2-7-133(h), there shall not be an early voting period. In the case of a May primary called pursuant to § 2-13-203 or a special primary for state or federal offices, if there is no opposition on either primary ballot for any of the offices involved, including any write-in candidate that has filed the appropriate notice pursuant to § 2-8-113(c), there shall not be an early voting period.

(2) Subdivision (b)(1) shall not apply to municipal elections held in the largest municipality located in a county having a metropolitan form of government which has a population in excess of five hundred thousand (500,000), according to the 2000 federal census or any subsequent federal census.