Northern Red Oak Identification: Leaves, Bark, Acorns

Northern red oak is identified by large leaves with 7 to 11 bristle-tipped lobes cut about halfway to the midrib, gray bark with flat-topped ridges that look like stripes, and big barrel-shaped acorns with a shallow cap. The Missouri Department of Conservation field guide gives the details:

• Leaf. 5-9 inches long with 7-11 lobes, each ending in a bristle; the sinuses between lobes reach about halfway to the midrib. Smooth and yellow-green above, smooth below with only occasional tufts where the veins meet.
• Bark. Greenish-brown to gray, turning brown to black with age; shallow grooves between wide, flat-topped ridges, so the trunk looks striped.
• Twig and buds. Slender, reddish-brown twigs, hairy at first and then smooth and shiny; reddish buds fringed with hair.
• Acorn. 1 to 1 1/4 inches, barrel-shaped, shiny reddish-brown, with a cup that covers only about a quarter of the nut. Like all red-group oaks, it ripens in the autumn of its second year.

Wikipedia adds that fall color is a rich red, sometimes brown.

Both are red-group oaks with bristle-tipped lobes, so the leaf outline alone rarely separates them. Turn the leaf over and check the buds:

• Underside. Northern red oak is smooth, with occasional small tufts where veins meet (MDC). Black oak is pale and conspicuously fuzzy underneath (MDC), and University of Kentucky Extension singles out the tufts of downy, velvety hairs where the veins meet as the feature that separates black oak from northern red oak, scarlet oak and southern red oak.
• Upper surface. Northern red oak is smooth and yellow-green; black oak is often dark and shiny.
• Lobes. Northern red oak has 7-11 lobes cut about halfway; black oak has 5-7 lobes, deep on sunlit leaves and shallow on shaded ones (MDC; UK Extension).
• Buds. Northern red oak buds are reddish with a hairy fringe; black oak end buds are sharp-pointed, distinctly angled and covered with gray hairs (MDC).
• Inner bark. Cut a small nick in the bark: black oak inner bark is mustard-yellow to orange (MDC).
• Acorn cup. Northern red oak's cup covers about a quarter of the nut; black oak's is deep and covers about half (MDC).

Northern red oak is also called red oak or common red oak, and it is the state tree of New Jersey and the provincial tree of Prince Edward Island (Wikipedia). Older botanical names you may see on labels and in old books include Quercus borealis and Quercus ambigua, both listed as synonyms of Quercus rubra (Wikipedia). The Missouri field guide lists black, scarlet, Shumard, pin, cherrybark, Nuttall's, southern red and blackjack oaks as similar species, which is why nurseries and lumberyards often use 'red oak' loosely. When a label matters, confirm with the leaf underside, the acorn cup and the striped bark.

• Oak wilt. Wikipedia names oak wilt, caused by the fungus Bretziella fagacearum, as a major pathogen in eastern North America that can kill trees quickly, and notes red oak's susceptibility.
• Wood outdoors. Red oak's grain is so open that, as Wikipedia puts it, smoke can be blown through a flat-sawn board end to end, which makes it unsuitable for outdoor uses such as boatbuilding or exterior trim unless treated.
• Size. A tree that can reach 92 feet in a forest and live to 400 years (Wikipedia) needs room; plan for it before planting near a house.

Standing timber is priced per 1,000 board feet (MBF). The New York State Department of Environmental Conservation's Winter 2025 stumpage price report gives these median average prices for red oak:

• Western/Central region (Doyle rule): $600 per MBF, range $150-1,100.
• Hudson/Mohawk (International 1/4-inch rule): $500 per MBF.
• Adirondack (International 1/4-inch rule): $350 per MBF.
• Delaware/Catskill (Scribner rule): $325 per MBF.

NYSDEC flags the Adirondack and Delaware/Catskill figures as coming from fewer than 20 survey responses and the Hudson/Mohawk figures from fewer than 5, and describes the prices as historical, reflecting the previous six months. A single yard tree is rarely sold on these terms; the figures are useful for woodlot owners judging an offer, and a consulting forester can measure your trees.

Photograph a sunlit leaf flat on a ruler, the underside with a vein junction in focus, a twig tip with its buds, an acorn with its cap, and the trunk at chest height showing the striped ridges. NatureLens can suggest the species from those photos (free scans every day), and the checks above confirm it.

Research and drafting for this page used AI assistance. Every measurement, date, price and claim was then checked against the sources listed below, which were opened and read on 2026-09-25. Where two sources give different numbers, both are shown.