<SEC-DOCUMENT>0001047469-20-003049-index.html : 20200514
<SEC-HEADER>0001047469-20-003049.hdr.sgml : 20200514
<ACCEPTANCE-DATETIME>20200514074309
ACCESSION NUMBER:		0001047469-20-003049
CONFORMED SUBMISSION TYPE:	424B5
PUBLIC DOCUMENT COUNT:		4
FILED AS OF DATE:		20200514
DATE AS OF CHANGE:		20200514

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FIRST INTERSTATE BANCSYSTEM INC
		CENTRAL INDEX KEY:			0000860413
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				810331430
		STATE OF INCORPORATION:			MT
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		424B5
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-237226
		FILM NUMBER:		20875305

	BUSINESS ADDRESS:	
		STREET 1:		P O BOX 30918
		STREET 2:		401 NO 31ST STREET
		CITY:			BILLINGS
		STATE:			MT
		ZIP:			59116-0918
		BUSINESS PHONE:		4062555300

	MAIL ADDRESS:	
		STREET 1:		P O BOX 30918
		STREET 2:		401 NO 31ST STREET
		CITY:			BILLINGS
		STATE:			MT
		ZIP:			59116-0918

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FIRST INTERSTATE BANCSYSTEM OF MONTANA INC
		DATE OF NAME CHANGE:	19930615
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B5
<SEQUENCE>1
<FILENAME>a2241637z424b5.htm
<DESCRIPTION>424B5
<TEXT>
Document 1 - file: a2241637z424b5.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g697092.jpg
<DESCRIPTION>G697092.JPG
<TEXT>
Document 2 - file: g697092.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g941845.jpg
<DESCRIPTION>G941845.JPG
<TEXT>
Document 3 - file: g941845.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g444579.jpg
<DESCRIPTION>G444579.JPG
<TEXT>
Document 4 - file: g444579.jpg

</DOCUMENT>
</SEC-DOCUMENT>