Willdan Group, Inc. (“Willdan”) (NASDAQ:WLDN) today announced the planned date for its first quarter 2010 financial results and conference call. On Thursday, May 13, 2010, after market close, Willdan plans to announce its first quarter 2010 financial results. Following the announcement, Chief Executive Officer Thomas Brisbin and Chief Financial Officer Kimberly Gant plan to host a conference call at 5:00 p.m. Eastern/2:00 p.m. Pacific on the same day, to further discuss the Company’s financial results. Interested parties may participate in the conference call by dialing 888-549-7750 (480-629-9866 for international callers). When prompted, ask for the “Willdan Group, Inc., First Quarter 2010 Conference Call.” The conference call will be webcast simultaneously on Willdan’s website at www.willdan.com under Investors: Events. The telephonic replay of the conference call may be accessed approximately two hours after the call through May 27, 2010, by dialing 800-406-7325 (303-590-3030 for international callers). The replay access code is 4290753. The webcast replay will be archived for 12 months. About Willdan Group, Inc. Founded over 40 years ago, Willdan is a provider of outsourced services to public and private agencies and utilities located primarily in California and New York. Willdan assists cities, public utilities and other government agencies and, to a lesser extent, private industry with a broad range of services, including civil engineering, building and safety services, geotechnical engineering, energy efficiency, water conservation, renewable resource strategy, financial and economic consulting, and disaster preparedness and homeland security. For additional information, visit Willdan’s website at www.willdan.com. Forward-Looking Statements Safe Harbor Statement: Statements in this press release which are not purely historical, including statements regarding Willdan’s intentions, hopes, beliefs, expectations, representations, projections, estimates, plans or predictions of the future are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. The forward-looking statements involve risks and uncertainties including, but not limited to, the risk that Willdan will not be able to expand its services or meet the needs of customers in markets in which it operates. It is important to note that Willdan’s actual results could differ materially from those in any such forward-looking statements. Factors that could cause actual results to differ materially include, but are not limited to, a slowdown in the local and regional economies of the states where Willdan conducts business and the loss of or inability to hire additional qualified professionals. Willdan’s business could be affected by a number of other factors, including the risk factors listed from time to time in Willdan’s SEC reports including, but not limited to, the Form 10-K annual report for the year ended January 1, 2010 filed on March 30, 2010. Willdan cautions investors not to place undue reliance on the forward-looking statements contained in this press release. Willdan disclaims any obligation to, and does not undertake to, update or revise any forward-looking statements in this press release.