Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos. 33-21680, 33-57117, 333-83251, 333-136071, 333-150781, 333-189086, and 333-224482 on Form S-8 of our report dated February 23, 2022, relating to the financial statements of Valmont Industries, Inc., and our report dated February 23, 2022 relating to the effectiveness of Valmont Industries, Inc.’s internal control over financial reporting, appearing in this Annual Report on Form 10-K of Valmont Industries, Inc. for the year ended December 25, 2021.

/s/ DELOITTE & TOUCHE LLP

Omaha, Nebraska

February 23, 2022