How to Install a Robot Mower and Boundary Wire

Installing a robot mower takes most homeowners a morning to a full day, and almost all of that time goes into one job: telling the mower where the lawn ends. Wired models need a perimeter (boundary) wire pegged or buried around the lawn edge and around anything the mower should avoid. Wire-free models use RTK satellite positioning, vision cameras or both, and you map the boundary in an app by walking or driving the mower around the edge. Either way, the steps that make or break the setup are the same: put the charging base in the right spot, define clean boundaries with enough clearance, handle narrow passages and obstacles properly, and start with conservative settings. This guide walks through each step for both wired and RTK systems.

Part of our Lawn Care guide →

In this guide

1. Before You Start
2. Step 1: Place the Charging Base
3. Step 2: Lay the Boundary Wire (Wired Models)
4. Step 2 (Alternative): Map an RTK Wire-Free Mower
5. Step 3: First-Run Settings
6. Common Installation Problems
7. Ongoing Care After Installation
8. Frequently Asked Questions

Before You Start

Read your mower’s installation guide fully before you lay any wire. Clearance distances, maximum passage widths, guide-wire rules and slope limits differ between brands, and the numbers in your manual override the general ranges here. If you are still deciding whether a robot suits your yard, our guide are robot lawn mowers worth it covers yard types and trade-offs, and our best robot lawn mowers roundup compares models. For mowing height, watering and feeding, which still matter with a robot, see our lawn care guide.

Prep checklist

• Mow first. Cut the lawn to your normal height or slightly lower with a conventional mower. Robots are designed to maintain grass, not cut down tall growth.
• Clear the lawn. Pick up sticks, toys, hoses, dog waste and stones.
• Fill holes and level ruts. Robots can get stuck in dips and on exposed roots.
• Locate sprinkler heads and buried lines. Mark irrigation heads so you do not staple through pipe, and know where shallow cables run.
• Sketch the yard. Draw the lawn, beds, trees, patios, slopes and any separate lawn areas, then plan the wire route or map on paper.
• Gather tools. Pegs and wire from the kit, a rubber mallet, the measuring gauge if included, wire cutters, waterproof connectors, and a half-moon edger or flat spade if you plan to bury the wire.

Step 1: Place the Charging Base

The base is where the mower charges, waits out rain and, on wired models, where the boundary wire loop starts and ends. Good placement prevents most docking problems.

• Flat and level. Put it on level ground, not on a slope, so the mower docks squarely. Most manuals specify a small maximum tilt.
• At the lawn edge. Place it on the lawn or at the edge, with open grass in front. Many systems need a few feet of straight, unobstructed approach.
• Near power. The low-voltage transformer plugs into an outdoor GFCI outlet, ideally under cover. Run the low-voltage cable to the base and protect it in conduit or bury it shallowly where it crosses lawn.
• Shade if possible. A shaded spot keeps the battery cooler. Avoid low spots that flood.
• Central for large lawns. On big or complex lawns, a central base shortens trips home.
• Out of sight, if theft is a concern. A backyard location behind a gate is better than a front-yard corner visible from the street.

Anchor the base with the screws or pegs supplied once you have confirmed it docks reliably.

Step 2: Lay the Boundary Wire (Wired Models)

The boundary wire carries a low-voltage signal from the base. The mower senses it and turns around when it reaches the wire. The wire forms one continuous loop starting and ending at the base.

Get the clearances right

How far the wire sits from an edge depends on what is beyond the edge. Common guidance follows this pattern, but use the exact distances in your manual and the plastic measuring gauge many kits include:

Edge type	Wire placement	Why
Flush hard surface (patio, path, driveway level with lawn)	Closest to the edge; some systems let the mower run onto the surface slightly	The mower can roll over the edge safely, so it can cut right to it
Raised obstacle (wall, fence, raised bed, tree trunk)	Farther in from the edge	The mower’s body overhangs the wire before turning and must not bump the obstacle
Flower bed at lawn level	Middle distance	Prevents the mower from cutting plants at the bed edge
Drop-off, pond, pool or steep bank	Well in from the edge, often with extra margin or a barrier	The mower may slide on wet grass before turning

Peg the wire

1. Start at the base terminal, leaving the tail length your manual specifies.
2. Walk the perimeter, using the gauge to set the distance from the edge, and push or tap pegs in roughly every 2 to 3 feet on straight runs and closer together on curves. The wire should lie tight against the soil so the mower cannot snag it and grass can grow over it.
3. Make smooth curves rather than sharp right angles; many mowers handle 45-degree corners better than 90-degree ones.
4. Return to the base and connect both ends to the terminals as shown in the manual.

Create islands around obstacles

For a tree, flower bed or other obstacle inside the lawn, run the wire out from the perimeter to the obstacle, around it, and back along the same path, with the outgoing and returning wires laid right next to each other under the same pegs. Because the signals in the two side-by-side wires cancel out, the mower ignores that section and treats the obstacle as an island. Sturdy obstacles taller than the mower, such as large trunks, can sometimes be left unwired if the mower has a bump sensor, but wiring is gentler on bark. Do not cross wires over one another.

Handle passages and separate areas

A narrow strip connecting two lawn areas, such as a side yard, needs to be wide enough for the wire on both sides plus the mower between them. Manuals specify a minimum passage width. Below that width, the mower may refuse to cross, or you may need a guide wire running through the middle that the mower follows. A completely separate lawn, such as a front yard across a driveway, is either looped into the main wire across the hard surface (in a saw cut or under a cable protector) or set up as a secondary area that you carry the mower to.

Lay the guide wire, if your model uses one

Many wired mowers use one or more guide wires that run from the base to a far part of the lawn and connect to the boundary loop. The mower follows them home and out to remote zones. Lay it in a straight path through the middle of narrow passages and away from the boundary per the manual.

Test, adjust, then bury

Power on and run the mower’s installation test or a supervised mow. Watch it follow the boundary, dock and cross passages. Move pegs where it cuts into beds or misses strips. Once you are happy, either leave the wire pegged (grass grows over it within weeks) or bury it 1 to 2 inches deep by slicing a slot with an edger and pressing the wire in. Burying protects it from aerators, dethatchers and edging tools. Leave a little slack at corners for future adjustments. If you need to join wire, use the gel-filled waterproof connectors supplied, not twisted wire and tape.

Step 2 (Alternative): Map an RTK Wire-Free Mower

RTK models use a ground reference antenna plus satellite signals to locate the mower to within a few centimeters. Some combine this with cameras to see obstacles.

• Place the reference station. Mount the antenna where it has a wide, open view of the sky, usually on a pole, fence post or roof edge, away from tall walls and overhanging trees. Follow the manual’s height and distance recommendations from the base. Poor sky view is the most common cause of RTK errors.
• Connect to Wi-Fi or cellular. Install the app, pair the mower and update firmware before mapping.
• Map the boundary. Drive the mower around the lawn edge with the app’s joystick, or walk the perimeter as the app directs. Go slowly and stay a consistent distance from edges.
• Add no-go zones. Map beds, play equipment, ponds and trees as exclusion zones in the app.
• Add channels. Connect separate lawn areas with mapped channels across paths or driveways.
• Check weak-signal areas. Under dense tree canopy or along tall houses, RTK accuracy can drop. Some models handle this with vision or inertial sensors; others need you to adjust the map or skip those spots.

Step 3: First-Run Settings

• Cutting height: Start high, at or above your current grass height, and lower it gradually over a couple of weeks. Robot mowers cut a little at a time.
• Schedule: Most lawns need the mower working several hours a day at first, then less. Avoid night mowing where hedgehogs, toads or other wildlife are active, and avoid times when children and pets are in the yard.
• Rain settings: Enable the rain sensor or delay so the mower returns to the base in heavy rain. Mowing very wet grass can leave ruts.
• Security: Set the PIN code and alarm, and register the mower with the manufacturer.
• Edge cutting: Turn on perimeter or edge-trim passes if available.
• Slope settings: Confirm your steepest area is within the mower’s rated slope. Some models let you limit slope travel.
• Notifications: Turn on app alerts for stuck, lifted or out-of-boundary events.

Common Installation Problems

Mower will not dock: Base is not level, approach is too short or angled, or the wire is not centered under the base as specified. Re-seat the base and recheck the wire entry.

No signal or boundary error: A break in the wire. Check splices first, then look for cuts from edgers or animals. Inexpensive wire-break locators help on large lawns.

Mower leaves uncut strips at the edge: The wire is too far from a flush surface. Move it closer or plan on occasional string trimming.

Mower gets stuck: Look for dips, exposed roots, soft wet areas or narrow spots. Fill holes, raise the cutting height or exclude the area.

RTK position drifts: Move the reference antenna higher or to a spot with more open sky, and remap problem edges.

Ongoing Care After Installation

Clean the underside and blades every week or two during the season, replace the small pivoting blades when they dull, keep firmware updated and check the boundary after any landscaping work. Before aerating or dethatching, find the wire and flag it. In freezing climates, bring the mower indoors for winter, charge the battery fully and store it in a frost-free place; most manufacturers recommend leaving the base and wire in place.