Citations in the World Almanac (listed by cover date; color information is from the previous year): orange (1895-1935)
An article entitled “Albany Bureau of Academic Costume” in the 27 July 1902 edition of The Argus, an Albany NY newspaper, contains a list of Intercollegiate Bureau of Academic Costume (IBAC) hood lining patterns that had been assigned to some of the more prestigious colleges and universities of the time. In that article, Syracuse University is stated to have a hood lining with the single color of orange. This assignment never changed in subsequent IBAC lists. Because the university had not been listed in previous catalogues or advertisements by Cotrell & Leonard (the depository for the IBAC), Syracuse may not have been assigned a hood lining pattern until 1901 or 1902, immediately prior to the publication of this newspaper article.
Syracuse University students chose orange as their school color in 1890. Previously the university had used two colors: pink and blue.