As filed with the Securities and Exchange Commission on March 17, 2015.

Registration Nos. 2-99356

811-04367

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

Form N-1A

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933	x
Pre-Effective Amendment No.	¨
Post-Effective Amendment No. 222	x

and/or

REGISTRATION STATEMENT

UNDER

THE INVESTMENT COMPANY ACT OF 1940	x
Amendment No. 224	x
(Check Appropriate Box or Boxes)

COLUMBIA FUNDS SERIES TRUST I

(Exact Name of Registrant as Specified in Charter)

225 Franklin Street, Boston, Massachusetts 02110

(Address of Principal Executive Officers) (Zip Code)

Registrant’s Telephone Number, Including Area Code: (800) 345-6611

Christopher O. Petersen, Esq.

c/o Columbia Management Investment Advisers, LLC

225 Franklin Street

Boston, Massachusetts 02110

(Name and Address of Agent for Service)

Approximate Date of Proposed Public Offering:

It is proposed that this filing will become effective (check appropriate box)

x Immediately upon filing pursuant to paragraph (b)

¨ On (date) pursuant to paragraph (b)

¨ 60 days after filing pursuant to paragraph (a)(1)

¨ On (date) pursuant to paragraph (a)(1)

¨ 75 days after filing pursuant to paragraph (a)(2)

¨ On (date) pursuant to paragraph (a)(2) of rule 485.

If appropriate, check the following box:

¨ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

This Post-Effective Amendment relates solely to the Registrant’s Columbia AMT-Free Connecticut Intermediate Muni Bond Fund, Columbia AMT-Free Intermediate Muni Bond Fund, Columbia AMT-Free Massachusetts Intermediate Muni Bond Fund, Columbia AMT-Free New York Intermediate Muni Bond Fund, Columbia California Tax-Exempt Fund, Columbia Global Technology Growth Fund, Columbia New York Tax-Exempt Fund and Columbia Strategic Income Fund series. Information contained in the Registrant’s Registration Statement relating to any other series of the Registrant is neither amended nor superseded hereby.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant, COLUMBIA FUNDS SERIES TRUST I, certifies that it meets all the requirements for effectiveness of this Amendment to its Registration Statement under Rule 485(b) under the Securities Act of 1933 and has duly caused this Amendment to its Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of Boston, and The Commonwealth of Massachusetts on the 17^th day of March, 2015.

COLUMBIA FUNDS SERIES TRUST I
By:	/s/ Christopher O. Petersen
	Christopher O. Petersen
	President

Pursuant to the requirements of the Securities Act of 1933, this Amendment to the Registration Statement has been signed below by the following persons in the capacities indicated on the 17^th day of March, 2015.

Signature	Capacity	Signature	Capacity
/s/ Christopher O. Petersen Christopher O. Petersen	President (Principal Executive Officer)	/s/ David M. Moffett* David M. Moffett	Trustee
/s/ Michael G. Clarke Michael G. Clarke	Chief Financial Officer (Principal Financial Officer)	/s/ Charles R. Nelson* Charles R. Nelson	Trustee
/s/ Joseph F. DiMaria Joseph F. DiMaria	Chief Accounting Officer (Principal Accounting Officer)	/s/ John J. Neuhauser* John J. Neuhauser	Trustee
/s/ Douglas A. Hacker* Douglas A. Hacker	Chair of the Board	/s/ Patrick J. Simpson* Patrick J. Simpson	Trustee
/s/ Janet Langford Kelly* Janet Langford Kelly	Trustee	/s/ William F. Truscott* William F. Truscott	Trustee
/s/ Nancy T. Lukitsh* Nancy T. Lukitsh	Trustee	/s/ Anne-Lee Verville* Anne-Lee Verville	Trustee
/s/ William E. Mayer* William E. Mayer	Trustee

*	By:	/s/ Ryan C. Larrenaga
	Name:	Ryan C. Larrenaga** Attorney-in-fact

** Executed by Ryan C. Larrenaga on behalf of William F. Truscott pursuant to a Power of Attorney dated March 9, 2012, and incorporated by reference to Post-Effective Amendment No. 143 to Registration Statement No. 2-99356 of the Registrant on Form N-1A (Exhibit (q)(7)), filed with the Commission on March 14, 2012, on behalf of Nancy T. Lukitsh pursuant to a Power of Attorney dated August 24, 2011, and incorporated by reference to Post-Effective Amendment No. 128 to Registration Statement No. 2-99356 of the Registrant on Form N-1A (Exhibit (q)(7)), filed with the Commission on August 31, 2011, on behalf of David M. Moffett pursuant to a Power of Attorney dated May 1, 2011 and incorporated by reference to Post-Effective Amendment No. 125 to Registration Statement No. 2-99356 of the Registrant on Form N-1A (Exhibit (q)(6)), filed with the Commission on May 19, 2011 and on behalf of each of the other Trustees pursuant to a Power of Attorney dated May 1, 2010 and incorporated by reference to Post-Effective Amendment No. 105 to Registration Statement No. 2-99356 of the Registrant on Form N-1A (Exhibit (q)(i)), filed with the Commission on May 28, 2010.

Exhibit Index

Exhibit No.	Description
EX -101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase