Trader Joe's is planning to open a store Colorado this year -- likely in Boulder, according to published reports and business filings.The Boulder Daily Camera said a source close to the situation said the California grocer is "most likely" opening a store on Boulder's Twenty-Ninth Street Mall at 1710 29th St.Trader Joe's filed documents on Monday registering the business name with the Colorado Secretary of State and listing a Colorado registered agent.Trader Joe's expects to begin "transacting business or conducting activities" in Colorado as of April 1, according to papers filed with the Secretary of State.A spokeswoman for the company declined comment about the filing."We don't have anything to confirm," Alison Mochizuki told the newspaper.The property manager of Twenty Ninth Street also declined comment.Fortune Magazine described Trader Joe's as "no ordinary grocery chain" in a 2011 article. Fortune said the company "elevates food shopping from a chore to a cultural experience. It stocks its shelves with a winning combination of low-cost, yuppie-friendly staples (cage-free eggs and organic blue agave sweetener) and exotic, affordable luxuries -- Belgian butter waffle cookies or Thai lime-and-chili cashews -- that you simply can't find anyplace else."The company's 2010 sales put it on par with Whole Foods, making it No. 314 on the Fortune 500 list.