 There is a 50 percent probability that the first frost of the season will occur by October 21, and a 50 percent probability that the final frost will occur by April 16.The 2010 Census shows Travilah with a population of 12,159 in 3,950 housing units, and a land area of out of a total of .It has an average population density of , which is much lower than the comparable figure for Maryland's largest city (Baltimore) and Montgomery County's largest city (Rockville)—which are and , respectively.