tree line

American  

[tree-lahyn] / ˈtriˌlaɪn /

Or treeline

noun

1. timberline.

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tree line British  

noun

1. the zone, at high altitudes or high latitudes, beyond which no trees grow. Trees growing between the timberline and the tree line are typically stunted

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tree line Scientific  

1. See timberline

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Example Sentences

Viewed from the village below, or glimpsed on the way up the forested hill, the structure looks topographical—a glistening summit just above a tree line.

From The Wall Street Journal • Mar. 6, 2026

Although many of Alabama’s old-growth forests have long been cut down and replaced with trees that grow on a timeline more suitable for its logging industry, its tree line is still lush and visually impressive.

From Slate • Aug. 31, 2025

He used to farm the fields nearby their dug-out – hidden in a tree line.

From BBC • May 26, 2024

But he told The Oregonian/OregonLive that because the person responsible is reportedly occupying an upper-level apartment that’s above the leafy green tree line, “It is incredibly difficult to pinpoint which apartment is involved.”

From Seattle Times • May 17, 2024

He stops at the tree line and stares at my mother, who doesn’t seem to sense his presence at all.

From "I'll Give You the Sun" by Jandy Nelson