Arbor Day is observed in the Northern Mariana Islands on October 1 each year. This celebration involves a tree planting event organized by the government of the Commonwealth of the Northern Mariana Islands (CNMI), which is a territory of the USA located in the northwestern Pacific Ocean. The CNMI consists of 15 islands, many of which are of volcanic origin, and the active volcanoes impact the islands' forests, highlighting the importance of reforestation efforts. The Governor of the islands issues a proclamation to mark Arbor Day, which typically occurs during the last full week of September, often on a Saturday. While the official tree planting takes place on October 1, Arbor Day initiates Arbor Month, a period filled with various tree-related activities for both adults and children that lasts until the end of October.