Exhibit 99.1

PRESS RELEASE		Contact:           Richard P. Smith
For Immediate Release		President & CEO (530) 898-0300

TRICO BANCSHARES ANNOUNCES QUARTERLY RESULTS

CHICO, Calif. — (April 28, 2011) — TriCo Bancshares (NASDAQ: TCBK) (the “Company”), parent company of Tri Counties Bank (the “Bank”), today announced quarterly earnings of $2,800,000 for the quarter ended March 31, 2011. These earnings represent a $1,242,000 (79.7%) increase when compared to earnings of $1,558,000 reported for the quarter ended March 31, 2010. Diluted earnings per share for the quarter ended March 31, 2011 was $0.17 compared to diluted earnings per share of $0.10 for the quarter ended March 31, 2010.

Included in the Company’s results for the three month period ended March 31, 2011 is the acquisition of the banking operations of Granite Community Bank (“Granite”), Granite Bay, California from the FDIC under a whole bank purchase and assumption agreement with loss sharing on May 28, 2010 by Tri Counties Bank. The assets acquired and liabilities assumed in the Granite acquisition have been accounted for under the acquisition method of accounting (formerly the purchase method). The acquired loan portfolio and foreclosed assets are referred to as “covered loans” and “covered foreclosed assets”, respectively. Collectively these balances are referred to as “covered assets”.

Total assets of the Company increased $25,151,000 (1.2%) to $2,195,738,000 at March 31, 2011 from $2,169,587,000 at March 31, 2010. Total loans of the Company decreased $64,145,000 (4.4%) to $1,387,660,000 at March 31, 2011 from $1,451,805,000 at March 31, 2010. The decrease in loans is net of $64,802,000 of loans acquired in the acquisition of the banking operations of Granite. Total deposits of the Company increased $26,615,000 (1.5%) to $1,859,912,000 at March 31, 2011 from $1,833,297,000 at March 31, 2010. The increase in deposits is net of $95,001,000 of deposits acquired in the Granite acquisition on May 28, 2010, and a $70,000,000 decrease in certificates of deposit issued to the State of California during the fourth quarter of 2010. The following is a summary of the components of net income for the periods indicated:

		Three months ended
		March 31,
(in thousands)		2010				2010				$ Change				% Change
Net Interest Income		$	21,704			$	21,978				($274	)			(1.2	%)
Provision for loan losses			(7,001	)			(8,500	)			1,499				(17.6	%)
Noninterest income			9,350				7,547				1,803				23.9	%
Noninterest expense			(19,671	)			(18,803	)			(868	)			4.6	%
Provision for income taxes			(1,582	)			(664	)			(918	)			138.3	%
Net income		$	2,800			$	1,558			$	1,242				79.7	%

Net interest income during the first quarter of 2011 decreased $274,000 (1.2%) from the same period in 2010 to $21,704,000. The decrease in net interest income was due to a 0.09% (nine basis points) decrease in net interest margin on a fully tax-equivalent basis to 4.31% and a $73,354,000 (5.0%) decrease in average balance of loans. Much of the nine basis point decrease in net interest margin was due to the fact that despite historically low deposit rates, deposit balances continue to grow while the ability to deploy these growing deposits into some interest-earning asset other than short-term low-yield interest-earning cash at the Federal Reserve Bank has been limited. This limitation is the result of weak loan demand and investment yields that have been unattractive given their interest rate risk profile.

The following table details the components of the net interest income and net interest margin on a fully tax-equivalent (FTE) basis for the periods indicated:

		Three months ended												Three months ended
		March 31, 2011												March 31, 2010
		Average				Income/				Yield/				Average				Income/				Yield/
		Balance				Expense				Rate				Balance				Expense				Rate
Assets:
Loans		$	1,396,331			$	21,722				6.22	%		$	1,469,685			$	22,813				6.21	%
Investment securities — taxable			276,497				2,381				3.44	%			265,177				2,761				4.16	%
Investment securities — nontaxable			12,063				223				7.38	%			17,310				331				7.64	%
Cash at Federal Reserve and other banks			339,394				191				0.23	%			256,724				154				0.24	%
Total earning assets			2,024,285				24,517				4.84	%			2,008,896				26,059				5.19	%
Other assets			165,078												160,242
Total		$	2,189,363											$	2,169,138
Liabilities and shareholders’ equity:
Interest-bearing demand deposits			402,267				349				0.35	%			368,660				615				0.67	%
Savings deposits			592,084				367				0.25	%			522,246				642				0.49	%
Time deposits			432,166				1,111				1.03	%			560,266				1,801				1.29	%
Other borrowings			59,223				593				4.01	%			61,843				594				3.84	%
Junior subordinated debt			41,238				310				3.01	%			41,238				306				2.97	%
Total interest-bearing liabilities			1,526,978				2,730				0.72	%			1,554,253				3,958				1.02	%
Noninterest-bearing deposits			425,089												374,018
Other liabilities			33,761												36,667
Shareholders’ equity			203,535												204,200
Total liabilities and shareholders’ equity		$	2,189,363											$	2,169,138
Net interest rate spread(1)											4.12	%											4.17	%
Net interest income and interest margin(2)						$	21,787				4.31	%						$	22,101				4.40	%

The Company provided $7,001,000 for loan losses in the first quarter of 2011 versus $8,144,000 in the fourth quarter of 2010 and $8,500,000 in the first quarter of 2010. The allowance for loan losses increased $653,000 from $42,571,000 at December 31, 2010 to $43,224,000 at March 31, 2011. The provision for loan losses and increase in the allowance for loan losses during the first quarter of 2011 were primarily the result of changes in the make-up of the loan portfolio and the Bank’s loss factors in reaction to increased losses in the construction, commercial real estate, commercial & industrial (C&I), home equity and auto indirect loan portfolios.

Noninterest income for the three months ended March 31, 2011 was $9,350,000, an increase of $1,803,000 (23.9%) compared to the same period in 2010. The following table presents the key components of noninterest income for the periods indicated:

		Three months ended
		March 31,
(in thousands)		2011				2010				$ Change				% Change
Service charges on deposit accounts		$	3,430			$	3,778				($348	)			(9.2	%)
ATM fees and interchange			1,645				1,368				277				20.2	%
Other service fees			406				331				75				22.7	%
Mortgage banking service fees			361				307				54				17.6	%
Change in value of mortgage servicing rights			(60	)			(49	)			(11	)			22.4	%
Total service charges and fees			5,782				5,735				47				0.8	%
Gain on sale of loans			725				585				140				23.9	%
Commission on NDIP			360				267				93				34.8	%
Increase in cash value of life insurance			450				426				24				5.6	%
Change in indemnification asset			1,692				—				1,692
Gain (loss) on sale of foreclosed assets			200				40				160				400.0	%
Legal settlement			—				400				(400	)			(100.0	%)
Sale of customer checks			59				48				11				22.9	%
Lease brokerage income			33				37				(4	)			(10.8	%)
Gain (loss) on disposal of fixed assets			(9	)			(25	)			16				(64.0	%)
Commission rebates			(17	)			(16	)			(1	)			6.3	%
Other nonintrest income			75				50				25				50.0	%
Total other noninterest income			3,568				1,812				1,756				96.9	%
Total noninterest income		$	9,350			$	7,547			$	1,803				23.9	%

Service charges on deposit accounts were down $348,000 (9.2%) due to new overdraft regulations that became effective on July 1, 2010 and caused a decrease in non-sufficient funds fees. ATM fees and interchange income was up $277,000 (20.2%) due to increased customer point-of-sale transactions that are the result of incentives for such usage. Overall, mortgage banking activities, which includes mortgage banking servicing fees, change in value of mortgage servicing rights, and gain on sale of loans, accounted for $1,026,000 of noninterest income during the three months ended March 31, 2011 compared to $844,000 during the three months ended March 31, 2010. Commissions on sale of nondeposit investment products increased $93,000 (34.8%) during the three months ended March 31, 2011. The change in indemnification asset of $1,692,000 recorded during the three months ended March 31, 2011 is primarily due to an increase in estimated loan losses from the loan portfolio and foreclosed assets acquired in the Granite acquisition on May 28, 2010, and the fact that such losses are generally “covered” at the rate of 80% by the FDIC. The actual increase in estimated losses is reflected in decreased interest income, increased provision for loan losses and/or increased provision for foreclosed asset losses.

Noninterest expense for the three months ended March 31, 2011 was $19,671,000, an increase of $868,000 (4.6%), as compared to the same period in 2010. The following table presents the key components of noninterest expense for the periods indicated:

		Three months ended
		March 31,
(in thousands)		2011				2010				$ Change				% Change
Salaries		$	7,004			$	6,974			$	30				0.4	%
Commissions and incentives			916				546				370				67.8	%
Employee benefits			2,873				2,630				243				9.2	%
Total salaries and benefits expense			10,793				10,150				643				6.3	%
Occupancy			1,460				1,329				131				9.9	%
Equipment			921				974				(53	)			(5.4	%)
Change in reserve for unfunded commitments			50				—				50
Data processing and software			852				675				177				26.2	%
Telecommunications			406				413				(7	)			(1.7	%)
ATM network charges			482				458				24				5.2	%
Professional fees			287				716				(429	)			(59.9	%)
Advertising and marketing			432				521				(89	)			(17.1	%)
Postage			216				247				(31	)			(12.6	%)
Courier service			208				197				11				5.6	%
Intangible amortization			85				65				20				30.8	%
Operational losses			109				67				42				62.7	%
Provision for foreclosed asset losses			449				—				449
Foreclosed asset expense			167				197				(30	)			(15.2	%)
Assessments			867				784				83				10.6	%
Other			1,887				2,010				(123	)			(6.1	%)
Total other noninterest expense			8,878				8,653				225				2.6	%
Total noninterest expense		$	19,671			$	18,803			$	868				4.6	%

Salary and benefit expenses increased $643,000 (6.3%) to $10,793,000 during the three months ended March 31, 2011 compared to the three months ended March 31, 2010. Base salaries increased $30,000 (0.4%) to $7,004,000 during the three months ended March 31, 2011. The increase in base salaries was mainly due to a 2.9% increase in average full time equivalent staff to 670 that was substantially offset by increased deferral of loan origination related salaries due to increased loan production when compared to the three months ended March 31, 2010. Incentive and commission related salary expenses increased $370,000 (67.8%) to $916,000 during three months ended March 31, 2011 due primarily to increases in production related incentives and incentives tied to net income. Benefits expense, including retirement, medical and workers’ compensation insurance, and taxes, increased $243,000 (9.2%) to $2,873,000 during the three months ended March 31, 2011 primarily due to increases in stock option vesting and supplemental retirement plan expenses.

Other noninterest expenses increased $225,000 (2.6%) to $8,878,000 during the three months ended March 31, 2011 when compared to the three months ended March 31, 2010. Changes in the various categories of other noninterest expense are reflected in the table above. The changes are indicative of the economic environment which has lead to increases, or fluctuations, in professional loan collection expenses, provision for foreclosed asset losses, and foreclosed asset expenses. Occupancy and equipment expenses increased primarily due to one new branch opening in each of the first and second quarters of 2010, and two branches acquired in the Granite acquisition on May 28, 2010.

The effective tax rate on income was 36.1% and 29.9% for the three months ended March 31, 2011 and 2010, respectively. The effective tax rate was greater than the federal statutory tax rate due to state tax expense of $381,000 and $151,000, respectively, in these periods. Tax-exempt income of $140,000 and $208,000, respectively, from investment securities, and $450,000 and $426,000, respectively, from increase in cash value of life insurance in these periods, along with relatively low levels of net income before taxes, helped to reduce the effective tax rate.

In addition to the historical information contained herein, this press release may contain certain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. The reader of this press release should understand that all such forward-looking statements are subject to various uncertainties and risks that could affect their outcome. The Company’s actual results could differ materially from those suggested by such forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, variances in the actual versus projected growth in assets, return on assets, interest rate fluctuations, economic conditions in the Company’s primary market area, demand for loans, regulatory and accounting changes, loan losses, expenses, rates charged on loans and earned on securities investments, rates paid on deposits, competition effects, fee and other noninterest income earned as well as other factors detailed in the Company’s reports filed with the Securities and Exchange Commission which are incorporated herein by reference, including the Form 10-K for the year ended December 31, 2010. These reports and this entire press release should be read to put such forward-looking statements in context and to gain a more complete understanding of the uncertainties and risks involved in the Company’s business. Any forward- looking statement may turn out to be wrong and cannot be guaranteed. The Company does not intend to update any of the forward-looking statements after the date of this release.

TriCo Bancshares and Tri Counties Bank are headquartered in Chico, California. Tri Counties Bank has a 36-year history in the banking industry. It operates 34 traditional branch locations and 27 in-store branch locations in 23 California counties. Tri Counties Bank offers financial services and provides a diversified line of products and services to consumers and businesses, which include demand, savings and time deposits, consumer finance, online banking, mortgage lending, and commercial banking throughout its market area. It operates a network of 69 ATMs and a 24-hour, seven days-a-week telephone customer service center. Brokerage services are provided by the Bank’s investment services affiliate, Raymond James Financial Services, Inc. For further information please visit the Tri Counties Bank web site at http://www.tricountiesbank.com.

TRICO BANCSHARES — CONSOLIDATED FINANCIAL DATA
(Unaudited. Dollars in thousands, except share data)

		Three months ended
		March 31,				December 31,				September 30,				June 30,				March 31,
		2011				2010				2010				2010				2010
Statement of Income Data
Interest income		$	24,434			$	25,627			$	27,233			$	25,776			$	25,936
Interest expense			2,730				3,036				3,497				3,642				3,958
Net interest income		$	21,704			$	22,591				23,736				22,134				21,978
Provision for loan losses			7,001				8,144				10,814				10,000				8,500
Noninterest income:
Service charges and fees			5,782				6,045				5,237				6,082				5,735
Other income			3,568				3,836				1,926				2,022				1,812
Total noninterest income			9,350				9,881				7,163				8,104				7,547
Noninterest expense:
Base salaries net of deferred loan origination costs		$	7,004			$	7,160				7,131				6,990				6,974
Incentive compensation expense			916				478				294				526				546
Employee benefits and other compensation expense			2,873				2,434				2,473				2,469				2,630
Total salaries and benefits expense		$	10,793			$	10,072				9,898				9,985				10,150
Other noninterest expense			8,878				9,398				10,626				8,423				8,653
Total noninterest expense		$	19,671				19,470				20,524				18,408				18,803
Income (loss) before taxes		$	4,382			$	4,858				(439	)			1,830				2,222
Net income		$	2,800			$	3,126			$	1			$	1,320			$	1,558
Share Data
Basic earnings per share		$	0.18			$	0.20			$	0.00			$	0.08			$	0.10
Diluted earnings per share		$	0.17			$	0.20			$	0.00			$	0.08			$	0.10
Book value per common share		$	12.72			$	12.64			$	12.66			$	12.76			$	12.63
Tangible book value per common share		$	11.71			$	11.62			$	11.64			$	11.74			$	11.63
Shares outstanding			15,860,138				15,860,138				15,860,138				15,860,138				15,860,138
Weighted average shares			15,860,138				15,860,138				15,860,138				15,860,138				15,822,789
Weighted average diluted shares			16,023,589				16,009,538				15,972,826				16,107,909				16,073,875
Credit Quality
Nonperforming loans		$	71,053			$	75,987			$	84,983			$	72,708			$	70,284
Guaranteed portion of nonperforming loans(2)			3,736				3,937				4,131				4,674				4,853
Foreclosed assets, net of allowance			8,983				9,913				11,172				9,945				5,579
Loans charged-off			7,049				6,040				11,163				8,424				8,101
Loans recovered			701				1,698				689				513				468
Allowance for losses to total loans(1)			3.31	%			3.18	%			2.86	%			2.75	%			2.75	%
Allowance for losses to NPLs(1)			65	%			59	%			49	%			57	%			57	%
Allowance for losses to NPAs(1)			57	%			53	%			43	%			50	%			53	%
Selected Financial Ratios
Return on average total assets			0.51	%			0.56	%			0.00	%			0.24	%			0.29	%
Return on average equity			5.50	%			6.14	%			0.00	%			2.61	%			3.05	%
Average yield on loans			6.22	%			6.39	%			6.61	%			6.20	%			6.21	%
Average yield on interest-earning assets			4.84	%			4.88	%			5.31	%			5.13	%			5.19	%
Average rate on interest-bearing liabilities			0.72	%			0.76	%			0.87	%			0.92	%			1.02	%
Net interest margin (fully tax-equivalent)			4.31	%			4.30	%			4.63	%			4.41	%			4.40	%

TRICO BANCSHARES — CONSOLIDATED FINANCIAL DATA

(Unaudited. Dollars in thousands)

		Three months ended
		March 31,				December 31,				September 30,				June 30,				March 31,
		2011				2010				2010				2010				2010
Balance Sheet Data
Cash and due from banks		$	406,294			$	371,066			$	398,191			$	322,644			$	308,664
Securities, available-for-sale			279,824				277,271				250,012				275,783				292,065
Federal Home Loan Bank Stock			9,133				9,133				9,157				9,523				9,274
Loans held for sale			2,834				4,988				9,455				4,153				3,384
Loans:
Commercial loans			131,242				141,902				149,743				162,898				147,988
Consumer loans			388,142				423,238				436,597				434,943				444,831
Real estate mortgage loans			823,563				807,482				821,562				860,615				810,386
Real estate construction loans			44,713				46,949				44,890				42,484				48,600
Total loans, gross			1,387,660				1,419,571				1,452,792				1,500,940				1,451,805
Allowance for loan losses			(43,224	)			(42,571	)			(38,770	)			(38,430	)			(36,340	)
Foreclosed assets			8,983				9,913				11,172				9,945				5,579
Premises and equipment			18,552				19,120				18,947				19,001				19,178
Cash value of life insurance			50,991				50,541				49,972				49,546				49,120
Goodwill			15,519				15,519				15,519				15,519				15,519
Intangible assets			495				580				665				750				260
Mortgage servicing rights			4,808				4,605				3,905				4,033				4,310
FDIC indemnification asset			6,689				5,640				5,098				7,515				—
Accrued interest receivable			6,941				7,131				7,318				7,472				7,715
Other assets			40,239				37,282				36,185				36,251				39,054
Total assets			2,195,738				2,189,789				2,229,618				2,224,645				2,169,587
Deposits:
Noninterest-bearing demand deposits			427,116				424,070				389,315				386,617				378,695
Interest-bearing demand deposits			406,060				395,413				383,859				383,578				375,313
Savings deposits			608,582				585,845				577,603				552,616				533,115
Time certificates			418,154				446,845				537,764				567,138				546,174
Total deposits			1,859,912				1,852,173				1,888,541				1,889,949				1,833,297
Accrued interest payable			2,044				2,151				2,368				2,487				3,064
Reserve for unfunded commitments			2,690				2,640				2,840				2,840				3,640
Other liabilities			30,262				29,170				26,721				25,257				27,112
Other borrowings			57,781				62,020				67,182				60,452				60,952
Junior subordinated debt			41,238				41,238				41,238				41,238				41,238
Total liabilities			1,993,927				1,989,392				2,028,890				2,022,223				1,969,303
Total shareholders’ equity			201,811				200,397				200,728				202,422				200,284
Accumulated other comprehensive gain (loss)			1,086				1,310				3,606				4,132				2,053
Average loans			1,396,331				1,443,603				1,481,497				1,463,473				1,469,685
Average interest-earning assets			2,024,285				2,107,499				2,060,108				2,019,684				2,008,896
Average total assets			2,189,363				2,235,471				2,237,670				2,191,660				2,169,138
Average deposits			1,851,606				1,895,006				1,893,677				1,849,118				1,825,190
Average total equity		$	203,535			$	203,712			$	205,324			$	203,528			$	204,200
Total risk based capital ratio			14.5	%			14.2	%			13.8	%			13.6	%			13.5	%
Tier 1 capital ratio			13.2	%			12.9	%			12.6	%			12.3	%			12.3	%
Tier 1 leverage ratio			10.3	%			10.0	%			9.9	%			10.2	%			10.3	%
Tangible capital ratio			8.5	%			8.5	%			8.3	%			8.4	%			8.6	%