Beginning January 1, 2019, Iowa voters will be required to show a driver’s license, non-driver’s ID, passport, military ID, veterans ID, Tribal ID or Voter ID Card at the polls before they vote. Voters, starting in 2019, without an ID may cast a provisional ballot or have another registered voter attest to their identity.

So long as you are in line to vote at the time the polls close you will be allowed to vote.