How to Distinguish Red Oak, Black Oak, and Bur Oak

Overview

Red oak (Quercus rubra), black oak (Q. velutina), and bur oak (Q. macrocarpa) overlap in the eastern U.S. Differences in height, leaves, fall color, acorns, and bark allow identification.

Step 1: Overall Size

Red oak: ~60 ft tall, 70 ft wide. Black oak: ~60 ft tall and wide. Bur oak: larger, up to 80 ft tall, 90 ft spread. Bur oak is distinctly more massive.

Step 2: Leaf Shape & Size

Red oak: 5–8 in long, 4–6 in wide, 7–11 bristle-tipped lobes. Black oak: 4–10 in long, 3–6 in wide, 7–9 pointed lobes. Bur oak: up to 12 in, up to 9 rounded lobes—smaller near stem, larger at tip.

Step 3: Fall Color

Red oak: scarlet to deep red (some golden brown). Black oak: variable—yellow to red. Bur oak: chartreuse or yellow-brown (least showy).

Step 4: Acorn Details

Red oak: ¾–1 in, saucer cap. Black oak: smallest, ≤½ in, deeper cap. Bur oak: largest, 1½ in, frilly cap covering half.

Step 5: Bark

Young red oak: light gray, smooth; older: gray, ridged. Black oak: dark gray to nearly black, deep ridges/furrows. Bur oak: dark gray, prominent ridges visible at distance.