What is the oldest tree in Portland?

Portland's Heritage Tree register is unusually good and unusually blunt: it gives girth, height, species and a per-tree coordinate, and it records ownership. What it does not record is age, so 'oldest' here means oldest with a published date. The Corbett Oak's 300 years come from the Oregon Encyclopedia; the runner-up with a documented date is the Dosch Yellow Bellflower apple in Hillsdale, planted around 1850. The Irvington elm, judged from its girth alone, could be anywhere from 175 to 350, so the oak's title is the best answer the sources allow rather than a certainty. Roughly two fifths of the register's trees stand in private yards, and none of those appear on this page: everything here stands on right-of-way, park, cemetery or public campus ground. The register also lags reality, since a 2026 delisting ordinance confirmed trees dead that its own rows still listed, so each entry here was checked separately, and where we could not confirm that a tree is still standing, its page says so.