Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We have issued our reports dated April 11, 2018 with respect to the consolidated financial statements and internal control over financial reporting of Argan, Inc. included in the Annual Report on Form 10-K for the year ended January 31, 2018, which are incorporated by reference in this Registration Statement. We consent to the incorporation by reference of the aforementioned reports in this Registration Statement.

/s/ GRANT THORNTON LLP

Philadelphia, Pennsylvania

June 27, 2018