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

OMB APPROVAL OMB Number: 3235-0104 Expires: January 31, 2005 Estimated average burden hours per response... 0.5

(Print or Type Responses)

1. Name and Address of Reporting Person *   HEYNEMAN JOHN M JR 2. Date of Event Requiring Statement (Month/Day/Year) 05/07/2010 3. Issuer Name and Ticker or Trading Symbol FIRST INTERSTATE BANCSYSTEM INC [N/A] (Last) (First) (Middle) PO BOX 9 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) DAYTON, WY 82836 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)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
	Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

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)	05/07/2010	05/07/2020	Class A Common Stock	1,972	$ 15.91	D	Â
Class B Common Stock (2)	05/07/2010(3)	05/07/2010(3)	Class A Common Stock	15,000	$ 0	D	Â
Class B Common Stock (2)	05/07/2010(3)	05/07/2010(3)	Class A Common Stock	123,184	$ 0	I	By Self as Trustee
Class B Common Stock (2)	05/07/2010(3)	05/07/2010(3)	Class A Common Stock	3,232	$ 0	I	By Spouse
Class B Common Stock (2) (4)	05/07/2010(3)	05/07/2010(3)	Class A Common Stock	1,155,792	$ 0	I	By Self as Managing Partner

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
HEYNEMAN JOHN M JR PO BOX 9 DAYTON, WY 82836	  X	Â	Â	Â

Signatures

/s/ Terrill R. Moore, Attorney-in-Fact for Reporting Person		05/07/2010
**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)	Stock options granted at the discretion of the Compensation Committee of the Board of Directors for no consideration. 100% vested on date of grant.
(2)	Class B common stock is convertible into Class A common stock on a share per share basis at any time.
(3)	Class B common shares are convertible into Class A common shares at any time, without expiration.
(4)	Disclaims beneficial ownership except to the extend of Mr. Heyneman's pecuniary interest in the partnership.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.