Iowa Code § 275.24: Effective date of change.

1. If a proposition to enlarge, reorganize, or change the boundary of a school district pursuant to sections 275.12 through 275.18, 275.20, and 275.22, is approved by voters pursuant to section 275.18 prior to January 1, 2025, the change shall take effect on July 1 following the date of the reorganization election held pursuant to section 275.18.

2. If a proposition to enlarge, reorganize, or change the boundary of a school district pursuant to sections 275.12 through 275.18, 275.20, and 275.22, is approved by voters pursuant to section 275.18 on or after January 1, 2025, the change shall take effect on July 1 in the calendar year immediately subsequent to the calendar year in which the reorganization election was held pursuant to section 275.18.