How-to Guide
How to Plant a Windbreak or Shelterbelt
The short answer
Site a windbreak on the north and west sides of the property to block prevailing winter winds, and expect meaningful protection to extend downwind until it becomes minimal at about 15 to 20 times the height of the windbreak - so a 20-foot windbreak shelters a long way past itself.
Plant a minimum of three rows (up to 8-11 rows improves protection further), and keep the inside row about 50 feet from the area you are protecting - or 100 feet for wider windbreaks - so drifting snow settles between the trees and the buildings rather than on top of them.
How far a windbreak protects
A windbreak works by slowing wind over a distance, not by forming a wall. Iowa State Extension notes that protection becomes minimal at 15 to 20 times the height of the windbreak - so the taller the mature trees, the larger the sheltered zone downwind.
That relationship is why windbreak planning is done in multiples of height (H) rather than fixed distances: a low shrub row protects a small area, while a tall multi-row belt shelters a farmstead, garden, and outbuildings well beyond the trees themselves.
Rows and density
More rows mean a denser barrier and better protection. Iowa State advises planting a minimum of three rows, with additional rows up to 8-11 improving protection. A mix of shrubs, small trees, and tall trees across the rows gives protection from ground level up.
The goal is a semi-permeable barrier that filters and slows wind rather than a solid one. A solid wall creates strong turbulence on the leeward side; a windbreak of layered trees and shrubs spreads the slowdown over a much greater distance.
Placement and snow
Orientation matters: locate the windbreak on the north and west sides of the property to protect against prevailing winter winds from those directions. This is also where a windbreak does the most to cut heating costs and catch blowing snow.
Set the inside row about 50 feet away from the protected site to minimize snow accumulation on buildings, or 100 feet from the outside rows for wider windbreaks. Placing it too close piles snow where you do not want it; the setback lets drifts form harmlessly among the trees.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- Iowa State University Extension - Windbreaks — States windbreak protection becomes minimal at 15 to 20 times the height of the windbreak, advises a minimum of three rows (up to 8-11 rows improves protection), recommends the inside row be 50 feet from the protected site (or 100 feet from outside rows for wider windbreaks) to minimize snow accumulation, and to locate the windbreak on the north and west sides against prevailing winter winds.