Indiana Code Title 3. Elections § 3-10-9-3

Sec. 3. (a) Except as provided in subsection (b), if a local public question must be certified to an election board by law, that certification must occur no later than noon:

(b) A referendum or local public question:

may be placed on the ballot only at a general election.  Certification of a local public question under this subsection must occur not later than noon August 1.