EX-23.2 3 ny20001148x1_ex23-2.htm EXHIBIT 23.2

Exhibit 23.2
Consent of Independent Registered Public Accounting Firm
We consent to the reference to our firm under the caption “Experts” in this Registration Statement (Form S-4) and related Prospectus of First Interstate BancSystem, Inc. for the registration of shares of its common stock and to the incorporation by reference herein of our reports dated November 23, 2020, with respect to the consolidated financial statements of Great Western Bancorp, Inc. and the effectiveness of internal control over financial reporting of Great Western Bancorp, Inc. included in Great Western Bancorp, Inc.’s Annual Report (Form 10-K) for the year ended September 30, 2020, filed with the Securities and Exchange Commission.
/s/ Ernst & Young LLP
Minneapolis MN
November 4, 2021