Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002:

The undersigned, Avner M. Applbaum, President and Chief Executive Officer of Valmont Industries, Inc. (the “Company”), has executed this certification in connection with the filing of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 29, 2025 (the “Report”) with the Securities and Exchange Commission.

The undersigned hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of his knowledge that:

IN WITNESS WHEREOF, the undersigned has executed this certification as of the 29th day of April 2025.

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CERTIFICATION OF CHIEF FINANCIAL OFFICER

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002:

The undersigned, Thomas Liguori, Executive Vice President and Chief Financial Officer of Valmont Industries, Inc. (the “Company”), has executed this certification in connection with the filing of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 29, 2025 (the “Report”) with the Securities and Exchange Commission.

The undersigned hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of his knowledge that:

IN WITNESS WHEREOF, the undersigned has executed this certification as of the 29th day of April 2025.

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