UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

FORM 8-K
CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (date of earliest event reported): February 23, 2006

FIRST INTERSTATE BANCSYSTEM, INC.

(Exact name of registrant as specified in its charter)

Montana		33-64304		81-0331430
(State or other jurisdiction of incorporation)		(Commission File No.)		(IRS Employer Identification No.)
401 North 31st Street, Billings, MT				59116
(Address of principal executive offices)				(Zip Code)
(406) 255-5390
(Registrant’s telephone number, including area code)
Not Applicable
(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the Registrant under any of the following provisions:

		o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
		o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
		o Pre-commencement communications pursuant to Rule 14d-2(b) under Exchange Act (17 CFR 240.14d-2(b))
		o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

 

 

Item 7.01 Regulation FD Disclosure.

     The information furnished under Item 8.01 is also being furnished under this Item 7.01.

Item 8.01 Other Events.

     On February 23, 2006, First Interstate BancSystem, Inc. (“FIBS”) received notification from its independent appraiser that the minority appraised value of its common stock as of December 31, 2005 was $71.00 per share, an increase of $3.00 from the September 30, 2005 valuation.

SIGNATURE

     Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: February 23, 2006