Apogee Enterprises (APOG) 10-K 2017 FY Annual report

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Apogee Enterprises, Inc. (the “Company”) on Form 10-K for the period ended March 3, 2018, as filed with the Securities and Exchange Commission (the “Report”), I, Joseph F. Puishys, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant §906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Joseph F. Puishys

Joseph F. Puishys

President and Chief Executive Officer

April 30, 2018