Valmont Industries (VMI) 10-K 2016 FY Annual report

Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos. 33-21680, 33-57117, 333-02785, 333-64170, 333-78017, 333-83251, 333-87432, 333-136071, 333-150781 and 333-189086 of Valmont Industries, Inc. and Subsidiaries (the “Company”) on Form S-8 and Registration Statement Nos. 333-59912, 333-165926 and 333-198522 of the Company on Form S-3 of our reports dated February 28, 2017, relating to the consolidated financial statements and financial statement schedule of the Company and the effectiveness of the Company’s internal control over financial reporting, appearing in this Annual Report on Form 10-K of Valmont Industries, Inc. for the fiscal year ended December 31, 2016.

/s/ DELOITTE & TOUCHE LLP

Omaha, Nebraska

February 28, 2017