Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Scott Jonathan R
 2. Date of Event Requiring Statement (Month/Day/Year)
05/05/2006		 3. Issuer Name and Ticker or Trading Symbol
FIRST INTERSTATE BANCSYSTEM INC [N/A]
(Last)
(First)
(Middle)
PO BOX 30918		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

BILLINGS, MT 59116-0191		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 218,335
I
By Self as Trustee
Common Stock 7,453
I
By Spouse
Common Stock 161
I
By Child

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Options (1) 05/05/2006 05/05/2016 Common Stock 834 $ 71 D  
Stock Options (2) 01/26/2006 01/25/2016 Common Stock 350 $ 68 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Scott Jonathan R
PO BOX 30918
BILLINGS, MT 59116-0191		   X      

Signatures

/s/: Terrill R. Moore, Attorney-in-Fact for Reporting Person 05/12/2006
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Includes 296 options issued in lieu of cash payment for annual Board of Director retainer fee and 538 options granted at the discretion of the Compensation Committee of the Board of Directors for no consideration. All options are 100% vested at date of grant.
(2) Vests over three years - 25% on date of grant and 25% on each annual anniversay date.

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