Exhibit 99.1

TRICO BANCSHARES ANNOUNCES QUARTERLY RESULTS

CHICO, Calif. – (October 29, 2013) – TriCo Bancshares (NASDAQ: TCBK) (the “Company”), parent company of Tri Counties Bank (the “Bank”), today announced earnings of $7,361,000, or $0.45 per diluted share, for the three months ended September 30, 2013. These results compare to earnings of $5,020,000, or $0.31 per diluted share reported by the Company for the three months ended September 30, 2012.

Total assets of the Company increased $116,625,000 (4.6%) to $2,632,106,000 at September 30, 2013 from $2,515,481,000 at September 30, 2012. Total loans increased $81,404,000 (5.2%) to $1,657,051,000 at September 30, 2013 from $1,575,647,000 at September 30, 2012. Total investment securities increased $125,045,000 (68.2%) to $308,477,000 at September 30, 2013 from $183,432,000 at September 30, 2012. Total deposits increased $91,672,000 (4.2%) to $2,293,311,000 at September 30, 2013 from $2,201,639,000 at September 30, 2012. Cash and due from banks decreased $81,344,000 (13.1%) to $541,150,000 at September 30, 2013 from $622,494,000 at September 30, 2012.

The following is a summary of the components of the Company’s consolidated net income for the periods indicated:

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

ANALYSIS OF CHANGE IN NET INTEREST MARGIN ON EARNING ASSETS

(unaudited, dollars in thousands)

Net interest income (FTE) during the three months ended September 30, 2013 increased $774,000 (3.0%) from the same period in 2012 to $26,470,000. The increase in net interest income (FTE) was primarily due to increased loan and investment balances that were funded by reducing lower yielding cash at the Federal Reserve Bank. A decrease in the average balance of other borrowings also helped to increase net interest income from the year-ago quarter. Average loan and investment balances increased $61,690,000 (3.9%) and $65,199,000 (31.7%), respectively, and added $1,001,000 and $605,000 to net interest income, respectively, when compared to the year-ago quarter. Included in the increase in average loan balances was the effect of the purchase of $60,647,000 of residential real estate loans in the quarter ended June 30, 2013. The increase in the average balance of investments was due to the Company’s decision to deploy some of its excess cash at the Federal Reserve Bank into higher yielding investments during the quarters ended June 30 and September 30, 2013. The average balance of other borrowings decreased $34,158,000 (81.6%) as the Company paid off a $50,000,000 borrowing on August 30,2012, and this reduction in other borrowings added $323,000 to net interest income when compared to the year-ago quarter. These favorable changes in asset and liability balances were partially offset by a 35 basis point decrease in the average yield on loans to 6.14% that decreased net interest income by $1,408,000 when compared to the year-ago quarter. The decrease in loan yields from the year-ago quarter is due mainly to the repricing of existing loans and the origination of new loans at current market yields that are lower than the yields that existed at earlier repricing and origination dates. Accretion of loan purchase discounts totaling $2,153,000 and $1,807,000 are included in net interest income for the three months ended September 30, 2013 and 2012, respectively. Decreases in rates paid for all categories of interest bearing liabilities added $292,000 to net interest income when compared to the year-ago quarter.

Loans acquired through purchase or acquisition of other banks are classified as Purchased Not Credit Impaired (PNCI), Purchased Credit Impaired – cash basis (PCI – cash basis), or Purchased Credit Impaired – other (PCI – other). Loans not acquired in an acquisition or otherwise “purchased” are classified as “originated”. Often, such purchased loans are purchased at a discount to face value, and part of this discount is accreted into (added to) interest income over the remaining life of the loan. Generally, as time goes on, the effect of this discount accretion becomes less and less as these purchased loans mature or payoff early. Further details regarding interest income from loans, including fair value discount accretion, may be found under the heading “Supplemental Loan Interest Income Data” in the Consolidated Financial Data table at the end of this announcement.

The Company benefited from a $393,000 reversal of provision for loan losses in the third quarter of 2013 versus a provision for loan losses of $532,000 in the third quarter of 2012. The level of provision for loan losses during the third quarter of 2013 was due primarily to a decrease in the required allowance for loan losses as of September 30, 2013 when compared to the required allowance for loan losses as of June 30, 2013 less net charge-offs during the three months ended September 30, 2013. The decrease in the required allowance for loan losses during the quarter ended September 30, 2013 was due primarily to reduced impaired loans, improvements in estimated cash flows and collateral values for the remaining and newly impaired loans, and reductions in historical loss factors that, in part, determine the required loan loss allowance for performing loans in accordance with the Company’s allowance for loan losses methodology.

The following table presents the key components of noninterest income for the periods indicated:

Noninterest income was $9,127,000 during the three months ended September 30, 2013, and was unchanged when compared to the three months ended September 30, 2012. Increases in ATM and interchange fees and change in value of mortgage servicing rights were offset by decreases in service charges on deposit accounts, gain on sale of loans, and change in indemnification asset. ATM and interchange fees increased $255,000 to $2,132,000 due to increased interchange fees from an ongoing effort to expand this business line. Change in value of mortgage servicing rights had an improvement of $862,000 going from a negative contribution of $681,000 in the three months ended September 30, 2012 to a positive contribution of $181,000 in the three months ended September 30, 2013. The $681,000 negative contribution from change in value of mortgage servicing rights in the quarter ended September 30, 2012 was due to decreased expected life of such assets, and an increase in market discount rates for such assets during the quarter ended September 30, 2012. The $181,000 positive contribution from change in value of mortgage servicing rights in the quarter ended September 30, 2013 was due to increased expected life of such assets during the quarter ended September 30, 2013. Service charges on deposit accounts decreased $264,000 to $3,353,000 due to reduced customer overdrafts and a resulting decrease in non-sufficient funds fees. Gain on sale of loans decreased $347,000 to $1,083,000 due to increased mortgage rates and a resulting decrease in mortgage refinance activity from the year-ago quarter. Change in indemnification asset was a negative contribution of $461,000 in the quarter ended September 31, 2013 compared to a negative contribution of $94,000 in the quarter ended September 30, 2012. This $367,000 increase in negative contribution from change in indemnification asset is reflective of continued and larger decreases in estimated future losses from covered assets. Such decreases in estimated losses from covered loans are also reflected in decreases in the Company’s provision for loan losses that offset this negative contribution from change in indemnification asset.

The following table presents the key components of the Company’s noninterest expense for the periods indicated:

Salary and benefit expenses increased $499,000 (4.0%) to $12,861,000 during the three months ended September 30, 2013 compared to the three months ended September 30, 2012. Base salaries increased $379,000 (4.5%) to $8,716,000 during the three months ended September 30, 2013 versus the year ago period due mainly to annual merit increases, and the addition of several higher compensated management positions, while the average number full-time equivalent staff decreased to 732 from 740 in the year-ago quarter. Incentive and commission related salary expenses decreased $88,000 (7.0%) to $1,166,000 during three months ended September 30, 2013 due

primarily to decreases in production related incentives. Benefits expense, including retirement, medical and workers’ compensation insurance, and taxes, increased $208,000 (7.5%) to $2,979,000 during the three months ended September 30, 2013 due primarily to increased health insurance and workers compensation insurance expenses.

Other noninterest expenses decreased $2,473,000 (18.7%) to $10,755,000 during the three months ended September 30, 2013 when compared to the three months ended September 30, 2012. The decrease in other noninterest expense was due primarily a $1,751,000 decrease in legal settlement expense to $339,000, a $622,000 (86.8%) decrease in the provision for, and expenses related to, foreclosed assets to $95,000, a $218,000 (30.7%) decrease in advertising and marketing expense to $492,000, and a $300,000 increase in reversal of provision for losses for unfunded commitments to a reversal of $335,000. Data processing and software expense was up $167,000 (16.4%) to $1,184,000. The decrease in foreclosed asset provision and expenses was due to increased property values and a reduction in foreclosed assets from $12,743,000 at June 30, 2012 to $4,140,000 at September 30, 2013. The decrease in advertising and marketing expense from the year ago period was due to cost savings efforts in this area. The increase in reversal of provision for losses for unfunded commitments was due to a decrease in construction loan related commitments and a decrease in historical loss rates.

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, 2012. 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 38-year history in the banking industry. It operates 41 traditional branch locations and 24 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 72 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)

TRICO BANCSHARES - CONSOLIDATED FINANCIAL DATA

(Unaudited. Dollars in thousands)