Gevo (GEVO) 10-Q 2016 Q2 Quarterly report

Exhibit 32.1

CERTIFICATIONS PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

(18 U.S.C. SECTION 1350)

I, Patrick R. Gruber, Chief Executive Officer of Gevo, Inc. (the “Registrant”), and I, Michael J. Willis, Chief Financial Officer of the Registrant, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Quarterly Report on Form 10-Q of the Registrant for the quarter ended June 30, 2016 (the “Report”), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant for the period covered by the Report.

Date: August 10, 2016

/s/ PATRICK R. GRUBER

Patrick R. Gruber

Chief Executive Officer

/s/ MICHAEL J. WILLIS

Michael J. Willis

Chief Financial Officer