Metal landscape edging creates a durable, clean boundary for lawns, beds, and paths, with steel and aluminum being the top choices for U.S. homeowners.
Keeping grass out of flower beds and mulch off the driveway comes down to a solid border. Plastic bends, concrete cracks, wood rots. Metal edging—steel and aluminum—solves all three problems with one install.
Steel vs. Aluminum: How They Compare
Steel wins on rigidity and long-term durability; aluminum is lighter and easier to shape around curves. Steel edging runs $5–$9 per linear foot for material, or $7–$14 per linear foot installed. Powder-coated steel jumps to $9–$15 per foot and $12–$22 per foot installed. Aluminum generally sits in the same range: a 50-foot project runs about $450–$900. Copper edging exists for decorative projects but costs significantly more with no practical advantage. For straight, long-term separation, steel is the default. For gentle curves or DIY-friendly handling, aluminum works well. Neither fits very tight radius bends unless specifically designed to flex.
Key Specs: Gauge, Height, and Burial Depth
Residential projects typically use 22- to 24-gauge steel; commercial jobs drop to 20 gauge or lower. Thinner than 24 gauge is too weak unless using aluminum. Standard visible height runs 4–8 inches above ground, with taller edging recommended on slopes or deep mulch. At minimum, 6 inches must be buried to prevent shifting, heaving, or frost push. The top edge should sit no more than half an inch above finish grade to avoid tripping hazards and mower blade strikes. Galvanized steel with G90 coating is baseline for corrosion resistance. Powder coating adds a second layer and more colors but costs more. Stake holes are spaced every 18–24 inches; each straight section needs at least five stakes.
How to Install Metal Landscape Edging Correctly
Installation runs: layout, trench, place, stake, backfill, and compact. The most common mistakes happen in the backfill step.
Step 1: Check for underground lines—irrigation hoses, cables, and utilities deeper than planned depth.
Step 2: Mark the border with string, garden hose, or spray paint.
Step 3: Dig a trench deep enough so edging top sits within half an inch of finished soil level; width should match edging profile.
Step 4: Place sections with stake pockets facing bed interior for a smooth visible face.
Step 5: Drive at least five stakes per section, spaced evenly. Don’t leave more than two sections unsupported at a time.
Step 6: Backfill and compact both sides simultaneously, packing soil firmly. Loose backfill is the top cause of leaning or heaving. Tap edging down to target height before finishing.
Step 7: Walk the line and tap down any sections higher than half an inch above grade with a rubber mallet.
Once installed, no ongoing maintenance is needed beyond periodic checks after heavy rain or frost. Repositioning a shifted section is simple: loosen soil, reset height, recompact.
Cost Breakdown by Project Size
| Project Size | Steel Edging | Aluminum Edging | Powder-Coated Steel |
|---|---|---|---|
| 20 linear feet | $120–$260 | $150–$280 | $180–$300 |
| 50 linear feet | $300–$600 | $450–$900 | $600–$1,100 |
| 100 linear feet | $600–$1,200 | $950–$1,800 | $1,200–$2,400 |
Installed costs add $5–$12 per linear foot depending on soil and labor rates.
Common Mistakes That Ruin a Good Install
Thin material fails first—avoid anything thinner than 24 gauge unless aluminum. Poor burial depth guarantees heaving and leaning. Setting the top edge higher than half an inch creates a tripping hazard and mower blade magnet. Backfill compaction is the hidden killer; loose soil around stake pockets leaves edging unsupported, and frost cycles push it out within one winter. Backfill both sides evenly and pack firmly.
If you are ready to compare specific products, our tested roundup of the best grass metal edging options covers what holds up under real yard conditions and which brands deliver on specs.
FAQs
Can metal edging rust if left exposed?
Galvanized steel resists rust via zinc coating that holds up in most climates. Powder-coated steel adds a second barrier, though scratches from rocks or tools can expose bare metal. Aluminum does not rust but can pit in coastal or highly acidic soil.
Is metal edging safe if kids play near it?
Yes, provided the top edge sits at or below half an inch above finish grade. At that height, tripping is unlikely, and there are no sharp exposed edges on properly installed edging.
How long does metal landscape edging last?
Steel with proper installation and G90 galvanized coating typically lasts 20–30 years. Powder-coated steel can extend that by 5–10 years. Aluminum lasts indefinitely but may need adjustments in heavy frost regions.
References & Sources
- Pro-Steel. Steel Edging Landscaping Specifications Provides gauge, height, and burial depth specifications for steel edging.
- Sure-Loc Edging. Steel Spec Sheet Details galvanized coating standards, stake spacing, and installation guidelines.
- Gardenista. Hardscaping 101: Metal Landscape Edging Covers material comparisons, pros and cons, and cost ranges for U.S. residential buyers.