UNITED STATES

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: April 15, 2010 Frontier Financial Corporation (Exact name of registrant as specified in its charter)
Washington (State of incorporation or organization)	000-15540 (Commission File Number)		91-1223535 (I.R.S. Employer Identification No.)
332 S.W. Everett Mall Way P.O. Box 2215 Everett, Washington (Address of principal executive offices)		98204 (Zip Code)
Registrant’s telephone number, including area code: (425) 514-0700

(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: [ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) [ ] Soliciting material pursuant to Rule 14a-12(b) under the Exchange Act (17 CFR 240.14a-12) [ ] 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))

~~SECURITIES~~Item ~~AND~~8.01 ~~EXCHANGE~~Other ~~COMMISSION~~Events.

On April 15, 2010, a purported securities fraud class action lawsuit was commenced in the United States District Court for the Western District of Washington in Seattle against Frontier Financial Corporation (the “Corporation”), Dand several of its directors and officers, Patrick M.C Fahey, John J. ~~20549~~Dickson, Michael J. Clementz and Carol E. Wheeler.

~~Form~~The 8plaintiffs allege that during the class period from July 22, 2008 to March 16, 2010, the defendants violated Sections 10(a) and 20(a) of the Securities Exchange Act of 1934 and SEC Rule 10b-K5 by issuing materially false and misleading statements regarding the Corporation’s business and financial results, failing to disclose the extent of delinquent commercial real estate loans and construction and land loans, and failing to adequately and timely record losses for its impaired loans, causing its financial results and its Tier 1 capital ratio to be materially false, and seek an unspecified amount of compensatory damages, attorneys’ fees and costs, and other relief. The Corporation, its directors and officers named as defendants believe that the plaintiffs’ allegations are without merit and intend to vigorously defend this action. It is possible that additional complaints containing similar claims may be made by other plaintiffs. As is typical in these types of claims, it is likely that all such cases will be consolidated into a single action.

~~CURRENT~~Failure ~~REPORT~~by the Corporation to obtain a favorable resolution of the claims set forth in the complaint could have a material adverse effect on our business, results of operations and financial condition. Currently, the amount of such material adverse effect cannot be reasonably estimated.

~~Pursuant~~Forward-Looking ~~to Section 13 OR 15(d) of~~Statements

~~The~~This report includes forward-looking statements and Frontier Financial Corporation intends for such statements to be covered by the safe harbor provisions of the Private Securities ~~Exchange~~Litigation Reform Act of ~~1934~~1995. These forward-looking statements describe Frontier Financial Corporation’s expectations regarding future events. Future events are difficult to predict and are subject to risk and uncertainty which could cause actual results to differ materially and adversely. Additional information regarding risks and uncertainties is included in Frontier Financial Corporation’s periodic filings on Forms 10-K and 10-Q with the Securities and Exchange Commission. Frontier Financial Corporation undertakes no obligation to revise or amend any forward-looking statements to reflect subsequent events or circumstances.

Date of Report:

March 31, 2010

Frontier Financial Corporation

(Exact name of registrant as specified in its charter)

Washington (State of incorporation or organization) 000-15540 (Commission File Number) 91-1223535 (I.R.S. Employer Identification No.)

332 S.W. Everett Mall Way P.O. Box 2215 Everett, Washington (Address of principal executive offices) 98204 (Zip Code)

Registrant’s telephone number, including area code: (425) 514-0700 (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(b) under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the 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 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers

On March 31, 2010, Frontier Financial Corporation (the “Corporation”), the bank holding company for Frontier Bank (“Frontier”), announced that John J. Dickson, President of Frontier, left employment with Frontier effective March 29, 2010, due to a dispute over the timing of a planned vacation. In addition, by letter dated March 30, 2010, Mr. Dickson resigned as a director of both Frontier and the Corporation (jointly the “Frontier Companies”). Mr. Dickson served on the Loan Committee and Trust Investment Committee for the Frontier Companies. His resignation as a member of the Board of Directors of Frontier Bank and Frontier Financial Corporation was related to the discontinuance of his employment as President of Frontier Bank. Mr. Dickson provided a letter to Mr. Patrick Fahey, Chairman and Chief Executive Officer of Frontier Bank, regarding the reasons for his resignation as a Director of Frontier Bank and Frontier Financial Corporation. A copy of Mr. Dickson’s resignation letter is attached hereto as Exhibit 99.1.

CAUTION ABOUT FORWARD-LOOKING STATEMENTS

This report contains “forward-looking statements” that are subject to risks and uncertainties. These forward-looking statements describe management’s expectations regarding future events and developments such as the fair market value of Frontier’s investment portfolio. Readers should not place undue reliance on forward-looking statements, which reflect management’s views only as of the date hereof. The words “should,” “anticipate,” “expect,” “will,” “believe,” and words of similar meaning are intended, in part, to help identify forward-looking statements. Future events are difficult to predict, and the expectations described above are subject to risks and uncertainties that may cause actual results to differ materially. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those anticipated, estimated or expected. In addition to discussions about risks and uncertainties set forth from time to time in the Corporation’s filings with the Securities and Exchange Commission, factors that may cause actual results to differ materially from those contemplated in these forward-looking statements include, among others: (1) the extent and duration of continued economic and market disruptions and governmental actions to address these disruptions; (2) the risk of new and changing legislation, regulation and/or regulatory actions; (3) pending litigation; (4) local and national general and economic conditions; (5) changes in interest rates; (6) reductions in loan demand or deposit levels; and (7) changes in loan collectibility, defaults and charge-off rates. Frontier Financial Corporation does not undertake to update forward-looking statements to reflect circumstances or events that occur after the date the forward-looking statements were made. Any such statements are made in reliance on the safe harbor protections provided under the Securities Exchange Act of 1934, as amended.

SIGNATURES

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

	FRONTIER FINANCIAL CORPORATION	~~FRONTIER FINANCIAL CORPORATION~~
	(Registrant)	~~(Registrant)~~
March 31, 2010		/s/ Patrick M. Fahey
April 20, 2010	/s/ Patrick M. Fahey
(Date)	Patrick M. Fahey Chief Executive Officer	~~Patrick M. Fahey Chief Executive Officer~~

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