The flag of the State of Vermont consists of the coat of arms and motto of Vermont on a rectangular blue background. The Vermont General Assembly adopted the current flag on June 1, 1923. Multiple versions of the flag have been included throughout history. Originally, the flag was the same as the flag of the Green Mountain Boys. It was then changed to look similar to the flag of the United States, consisting of red and white stripes, and a blue canton. It was changed to be dissimilar to avoid confusion. Proposals have been brought up to revert the flag back to the Green Mountain Boys' flag, but none have succeeded.
There is no record today of a design for an official Vermont Flag prior to 1804, although Ira Allen's design—common to both the Great Seal of Vermont and the coat of arms of Vermont—dates to 1778. While an official government flag might not have existed prior to 1804, the Vermont militia—known as the Green Mountain Boys—was formed in 1770, and remaining accounts record use of the Flag of the Green Mountain Boys as far back as 1777. On May 1, 1804, the number of U.S. states rose to seventeen, and it was expected that the U.S. flag would change to 17 stars and 17 stripes. In recognition, Vermont adopted what was expected to be the new U.S. flag with the addition of the name "VERMONT" embroidered along the top. The U.S. flag did not change in that way, resulting in the Vermont flag having more stripes than the national flag. On October 20, 1837, Vermont changed its flag to a design based on the current 13-stripe U.S. flag, but with the multiple stars of the blue canton replaced with a single large star surrounding Vermont’s coat of arms. The flags based on these specifications varied in the number of points on the star, and the exact details of the center of the star. During the American Civil War, the Spanish–American War, and the First World War, the Vermont militia fought under a banner composed of the Coat of arms of Vermont on a blue field. This was essentially the same as the Vermont Governor's flag, and very similar to the current state flag. Because of confusion between the striped Vermont state flag and the U.S. flag, the design of the Vermont Governor’s flag was adopted as the official state flag on June 1, 1923.