Exhibit 32

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED
PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned are the Chief Executive Officer and the Chief Financial Officer of First Interstate BancSystem, Inc. (the “Registrant”). This Certification is made pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. This Certification accompanies the Annual Report on Form 10-K of the Registrant for the year ended December 31, 2006.

We certify that such Annual Report on Form 10-K fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in the Form 10-K fairly presents, in all material respects, the financial condition and results of operations of the Registrant for the periods presented therein.

This Certification is executed as of March 12, 2007.

/s/ LYLE R. KNIGHT  

Lyle R. Knight 

President and Chief Executive Officer 

/s/ TERRILL R. MOORE  

Terrill R. Moore 

Executive Vice President and Chief Financial Officer