US 30 Year Bond Yield was 2.29 percent on Monday October 21, according to over-the-counter interbank yield quotes for this government bond maturity. Historically, the United States 30 Year Bond Yield reached an all time high of 15.21 in October of 1981 and a record low of 1.91 in August of 2019. For example, the 30-year mortgage rate historically runs 1% to 2% above the yield on 30-year Treasury bonds. Below is a graph of the actual Treasury yield curve as of May 13, 2018. 30-Year Bond A 30-year bond is just what the name implies. State and local governments, the Treasury Department and corporations issue bonds to borrow money for periods ranging from a few months to decades. If you buy a 30-year bond when it’s issued, it will pay interest until it matures in 30 years.