In 2000, the eastern limit of distribution of barnacle, Balanus glandula was discovered at Hiroo, Hokkaido. The survey was conducted at 25 rocks of 5 shores, east of Hiroo, Eastern Hokkaido during 2002-2011 to evaluate (i) temporal changes of distribution, (ii) whether recruitment is the primary determinant for the establishment of local population or not, (iii) the relative importance of recruitment vs. post recruitment processes as the determinant of population size at rock and shore level, and (iv) the effects of three dominant sessile natives on colonization and survival of local B. glandula population. During the study period, this species was firstly found at the most western shore in 2006 and spreaded toward east, with speed of the range expansion of 20 km/yr. The occupancy drastically increased at rock level while the mean coverage stayed at low level. The local extinction rates decreased with time. Population establishment was determined by recruitment for 12 populations whereas post-recruitment process for 9 populations. Recruitment process was the primary determinant of population size at shore level but not at rock level. Neither colonization nor survival probabilities of B. glandula population was significantly affected by three dominant sessile native species except the effect of Gloiopeltis furcata on colonization of B. glandula.