Immigrants are being asked to stay home from work, school and stores on May 1 to protest federal immigration reform legislation.
No Storm Lake industries have yet announced that they will close.
Organizers of National Day Without Immigrants say they hope it highlights the contributions immigrants make to the country and the economy.
Proposed legislation would make it a crime to be in the United States illegally or to assist illegal immigrants.
A coalition of Iowa organizations and individuals called United For the Dignity and Safety of Immigrants are organizing the event, which also is being promoted in other areas of the country.
Rose Arceo said she plans to close her Mexican restaurant on May 1.
"I close the store because I want to help the immigrants," said Arceo, who was born in Guadalajara, Mexico. "All my employees are planning on staying home. Nobody goes out and shops."
Cargill Meat Solutions, which owns a pork-processing plant in Ottumwa, will shut down May 1. Nearly half of Cargill's 2,400 employees in Ottumwa are Hispanic. "In talking with our employees, we think this was the right decision," said Mark Klein, a spokesman for Cargill.
Swift & Co. in Marshalltown has asked employees to request the time off on a "case by case" basis, a spokesman said.
Officials at Tyson Foods Inc., Storm Lake's largest employer, said this week that they have not decided how to handle employees who want the day off at their plants, an official said.