Installing a Fence Near Mature Oak Trees

Fence Posts and Oak Roots: How Close Is Too Close?

You plan an aluminum fence with posts 6 feet apart, dug 2 feet deep, running 10 feet from 50–75-year-old oaks. At 10 feet, the small percentage of roots cut will not harm the trees. Even at 2–3 feet from the trunk, a 30-year-old oak can withstand it, though digging will be harder due to woody roots. If possible, shift posts slightly farther out for easier excavation and less root loss.

Key point: the root zone impact is minimal at these distances. Proceed with the fence.