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):

                                 March 30, 2005

                                TriCo Bancshares
             (Exact name of registrant as specified in its charter)


         California                                           0-10661                                               94-2792841 
(State or other jurisdiction of                        (Commission File No.)                                     (I.R.S. Employer
incorporation or organization)                                                                                  Identification No.)

63 Constitution Drive, Chico, California                                                                           95973      
(Address of principal executive offices)                                                                         (Zip Code)

Registrant's telephone number, including area code:(530) 898-0300

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 (see General Instruction A.2. below):

[ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR

[ ] Soliciting material pursuant to rule 14a-12 under the Exchange Act (17 CFR

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
Act (17 CFR 240.13e-4(c))

Item 8.01: Other Events

Richard P. Smith, President and Chief Executive Officer of TriCo Bancshares (the
"Company"), has informed the Company that on March 30, 2005, he entered into a
written stock trading plan intended to comply with Rule 10b5-1 under the
Securities Exchange Act of 1934, as amended. Rule 10b5-1 allows directors and
officers of public companies to adopt a prearranged plan or contract for the
sale of securities under specified conditions and at specified times and may be
used to diversity investment portfolios over a period of time.

The plan provides that Mr. Smith may sell up to 37,500 shares of the Company's
common stock, which may include up to 37,500 shares issuable upon the exercise
of options expiring in June 2005. The underlying stock options were granted to
Mr. Smith in 1995 and must be exercised by June 13, 2005 or they become invalid.
The plan provides that Mr. Smith's stockbroker may sell a certain number of
shares per week at specified market prices, subject to certain specified
limitations, commencing on April 4, 2005 and ending on June 13, 2005. Mr. Smith
entered into the plan to implement an orderly process to exercise and sell
options that would soon expire and to help pay the related fees, commissions and

Mr. Smith currently reports beneficial ownership of 525,386 shares of the
Company's common stock including vested and non-vested stock options, but
excluding shares held by the Company's ESOP of which Mr. Smith is a trustee. The
37,500 shares to be sold by Mr. Smith pursuant to the plan represent
approximately 7% of his shareholdings.

The Company's Policy Concerning Trading in Company Securities permits executive
officers and directors to establish prearranged trading plans to govern the sale
of Company stock over a predetermined period of time. Individuals may create
these plans when they do not possess material inside information. Mr. Smith
established this plan during one of the Company-established trading windows
during which executive officers and directors may trade in Company securities.

Mr. Smith has confirmed to the Company that, as required by securities laws, he
will promptly publicly disclose any option exercises and/or stock sales made
under the plan. Except as may be required by law, the Company does not undertake
to report plans by other Company officers or directors, nor to report
modifications, terminations, transactions or other activities under Mr. Smith's
plan or the plans of any other officer or director.


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, thereunto duly authorized.

                             TRICO BANCSHARES

Date: March 30, 2005    By:  /s/ Thomas J. Reddish
                             Thomas J. Reddish, Executive Vice President and
                             Chief Financial Officer (Principal Financial and
                             Accounting Officer)