EXHIBIT 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in Registration Statement No. 333-87599 on Form S-8 of Heritage Financial Corporation of our report dated June 17, 2026 appearing in this Annual Report on Form 11-K of Heritage Financial Corporation 401(k) Profit Sharing Plan and Trust for the year ended December 31, 2025.

/s/ Crowe LLP

Oakbrook Terrace, Illinois

June 17, 2026