Ancient Trees in Chicago
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The Bur Oak on the Midway
Bur Oak (Quercus macrocarpa). roughly 250 to 300+ years. Free, public park path along the Midway Plaisance

The Bur Oak Grove of Wooded Island
Bur Oak (Quercus macrocarpa). the grove's oldest survivors are roughly 200 to 300 years. Free, public park, Chicago Park District (Wooded Island / Osaka Garden)

The Bur Oak Savanna of Union Ridge Cemetery
Bur Oak (Quercus macrocarpa). the oldest estimated at 325 to 375 years, based on trunk size. Free, cemetery grounds open to visitors during posted hours

The Champion Boxelder of Edgebrook
Box Elder (Acer negundo). not documented. Public 18-hole golf course, Forest Preserves of Cook County; a green fee is generally needed to walk the course itself, and whether the tree is visible from a public perimeter trail was not confirmed this pass