Iowans will be able to head to their caucuses Monday before an expected snowstorm brings heavy snowfall.
RELATED LINK: Find your caucus location (It is possible for your caucus location to be different from your regular polling place)
Voters are expected to gather at the caucus locations at 7 p.m.
Over the weekend, Republican and Democratic presidential candidates made last-minute pushes:
Hillary Clinton makes final pitch to voters in council Bluffs before caucus
Christie makes final stop in Council Bluffs before caucus
Trump makes final stop in Council Bluffs
Rubio campaigns in Council Bluffs
Voters who are registered for one party can change their party affiliation at their caucus site. Organizers say they should arrive early so they can fill out a postcard and have a valid driver's license with an address matching their voter roll.