This timeline of the Portolá expedition tracks the progress during 1769 and 1770 of the first European exploration-by-land of north-western coastal areas in what became Las Californias, a province of Spanish colonial New Spain. Later, the region was administratively-split into Baja (lower, see Baja California peninsula) and Alta (upper, see Alta California). The first section of the march was on the Baja California peninsula, and the northern section of the expedition's trail was in today's U.S.A. state of California.