Black Aluminum Fence Posts — In-Ground System

The last fence post you'll ever set. Welded-aluminum in-ground fence posts in matte black, in 4" x 4" and 5" x 5" profiles. They can't rot like wood and can't rust like steel — set them in concrete once and forget them. One Post, Two Jobs Run our aluminum or steel panels — the post system carries our privacy fence panels for a complete zero-rust build. Replace rotted wood posts under an existing wood fence — keep your boards, swap the failure point. Aluminum posts are the permanent fix for the 4x4 that keeps rotting off at grade. Never Dig Out a Rotted Post Again Wood posts fail where they meet the ground. Aluminum has no grain to wick water and nothing to rot — the below-grade section is as permanent as the concrete around it. The 9' and 12' lengths carry extra below-grade length for taller fence runs. Sizing — Same Grid as Our Steel Posts Two profiles and three lengths, matching our steel fence post grid exactly: choose 4" x 4" for standard fence lines, or 5" x 5" for gate posts and heavier-duty runs. 6' posts for low runs and rail work, 9' for standard privacy heights, 12' for 8' privacy fencing. On-Property Delivery & UnloadDelivered on our own trucks and unloaded on your property by our crew — no freight terminal pickup. Check your address in the shipping estimator for your current delivery window. Frequently Asked Questions Aluminum vs steel fence posts? Both outlast wood by decades. Aluminum adds zero-rust for life and lighter handling; steel offers maximum stiffness for the heaviest gate posts. For most fence lines, aluminum is the set-and-forget option. What post spacing should I use? 6' or 8' on-center, matching our panel widths. Do I need rot protection sleeves on these? No — sleeves protect wood posts. Aluminum needs nothing below grade. (If you're keeping wood posts elsewhere on the run, see our Post Rot Protection System.)