Peapack-Gladstone Financial (PGC) S-3D Registration of securities, dividend or interest reinvestment plans, immediately effective

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this registration statement on Form S-3 of Peapack-Gladstone Financial Corporation of our report dated March 12, 2018 relating to the consolidated financial statements of Peapack-Gladstone Financial Corporation and the effectiveness of internal control over financial reporting appearing in the Annual Report on Form 10-K of Peapack-Gladstone Financial Corporation for the year ended December 31, 2017, and to the reference to us under “Experts” in the prospectus.

/s/ Crowe LLP

Livingston, New Jersey

July 13, 2018