Why Do People Paint Trees White? The Real Reason Explained

If you’ve ever walked through a neighborhood or rural area and noticed tree trunks painted white, you might assume it’s a signal for property boundaries or warnings. But in reality, this practice often has nothing to do with people—it’s about protecting the trees themselves.

Homeowners and farmers frequently paint tree trunks white to prevent sunscald, also known as “southwest disease.” This condition occurs in winter when sunlight reflects off snow and damages thin bark, especially on younger trees. The damage can make trees more vulnerable to frostbite, infections, and pests like wood-boring insects. By reflecting harsh sunlight, the white coating helps reduce stress and long-term harm.

If you want to try this method, experts recommend using indoor, water-based latex paint diluted with water. Focus on exposed areas above the snow line rather than covering the whole trunk. Over time, the paint may fade and need reapplication.

While younger trees benefit the most, older ones may only need protection if pruning leaves bark exposed. For severe damage, consulting a tree care specialist is best.