FIRST INTERSTATE BANCSYSTEM, INC.
401 North 31st Street
Billings, Montana 59116
September 29, 2017
Securities and Exchange Commission
100 F Street, N.E.
Washington, D.C. 20549
Re: First Interstate BancSystem, Inc.
Registration Statement on Form S-3
Registration No. 333-220594
Ladies and Gentlemen:
In accordance with Rule 461 of the General Rules and Regulations under the Securities Act of 1933, as amended, a request is made hereby on behalf of First Interstate BancSystem, Inc. that acceleration of the effectiveness of the above-captioned Registration Statement be granted for 4:00 p.m. Eastern Time on October 3, 2017, or as soon thereafter as practicable.
| Very truly yours, | ||
| FIRST INTERSTATE BANCSYSTEM, INC. | ||
| By: | /s/ KIRK D. JENSEN | |
| Kirk D. Jensen | ||
| Executive Vice President and General Counsel | ||