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

Storms can brew up with terrifying speed and anyone caught above tree line is going to feel dangerously close to the action.

From Los Angeles Times • Sep. 15, 2025

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

I could bleed the engine tonight, set my alarm for 4 A.M., and be on the river before the sun was up over the tree line.

From "Red Kayak" by Priscilla Cummings