Geofencing advertising shows your display ads to the phones that go inside a boundary you draw on a map, such as a competitor's store, a trade show or a single job site. The more valuable part comes afterward: those phones join an audience that keeps seeing your ads for weeks after the person has gone home.
For a local business, that means you can reach people based on where they actually went, not just where they live. A visit to a competitor or an industry event says something about what a person wants, and the ads act on it.
It is a precise tool, but not a perfect one. Below is how it works, where to draw fences, how store visits get counted, and the accuracy limits worth understanding before you spend.
What a geofence actually is
A geofence is a boundary drawn on a map around a real place. Geofencing advertising, also called geofencing marketing, serves ads to the phones that enter it.
The boundary can be tight. It can follow the outline of a single address, a venue or a block, rather than a wide circle around a zip code. The shape gets drawn on a map around the actual property, so the fence matches the place you care about.
A campaign usually runs in a few steps:
- Pick the places. Choose locations where a visit tells you something about the person.
- Draw the fences. Each one is drawn around the actual place.
- Reach the phones inside. People see your display ads while they are on the property.
- Keep going after they leave. The phones that entered become an audience, and the ads continue for three or four weeks.
- Report fence by fence. Impressions and clicks for each fence, plus store visits where there is a location to count them at.
Geofencing is not the same as geotargeting
The two terms get mixed up constantly. Geotargeting reaches everyone in an area: a metro, a zip code, a radius. Geofencing reaches only the phones that physically entered a place you drew, then follows up with them.
Geotargeting is broad and good for building awareness across a market. Geofencing is narrow and good for reaching people who showed intent by showing up somewhere. Many campaigns run both, with programmatic display covering the wider area and fences picking out the people most likely to buy.
The kinds of places worth fencing
The best fences surround places where being there signals interest in what you sell. A random busy intersection rarely qualifies. A competitor's showroom usually does.
Places that tend to make sense:
- A competitor's location. People shopping there are in the market right now. Showing them your offer while they compare is called conquesting.
- Trade shows and job fairs. Attendees self-select by industry or need, which makes the audience unusually focused for a B2B seller or a hiring employer.
- A neighborhood your crews are working. Home service companies can fence the blocks around an active job, where neighbors have just seen a truck in the driveway.
- Events and venues. Concerts, sports, festivals and expos gather people who share an interest.
- A limited-time promotion at one site. A fence around a single store can support a sale or opening without paying to reach the whole metro.
- Your own location. This one is for measurement, covered in the next section.
A good test before drawing any fence: if someone stood inside it for twenty minutes, would that tell you they might buy from you? If the answer is no, the fence is probably reaching foot traffic rather than prospects.
Size matters in both directions
A tiny fence around a low-traffic spot will collect very few phones, and retargeting a handful of devices for weeks will not produce much to judge. A fence drawn too loosely starts catching people who were just passing by. The right size is usually the property itself, plus enough of the surrounding lot or block to cover where people actually are.
How store-visit measurement works
A fence can work in both directions. One around a competitor finds the audience. A second one around your own location counts how many of those people later came to you.
In practice, the report shows impressions and clicks for each fence. Where you have a physical location to fence, it can also show store visits: phones that saw your ads and later entered your property.
That is useful because clicks undersell local advertising. Plenty of people see a display ad, never tap it, and drive over a week later. Visit counts give you a way to see some of that behavior instead of guessing.
Read visit numbers as a signal, not a ledger
Store visits are a directional measure. They tell you whether a fence is sending people your way and how one fence compares to another. They are not a till receipt. A visit does not mean a sale, and some of those visitors would have come anyway. The most honest way to use the numbers is to compare fences against each other and against periods with no ads running.
The accuracy limits a buyer should know
Geofencing is sold on precision, so it is worth being clear about where that precision runs out.
- Placing a phone on a map is never exact. Edges are fuzzy. A fence around one storefront in a strip mall can catch some people from the shop next door, and miss some who were standing at the far end of the lot.
- Not every phone inside can be reached. The audience a fence builds is a portion of the people who visited, not all of them. Expect reach to be smaller than the actual crowd.
- Multi-story and dense buildings are harder. A fence cannot reliably tell which floor or which tenant someone visited. Fencing a single office inside a large tower is less dependable than fencing a standalone building.
- Visit counts are estimates. The same fuzziness that affects targeting affects measurement, so treat visit totals as approximate.
- Being there is not the same as wanting to buy. Employees, delivery drivers and people cutting through the lot all end up in the audience. Good fence choices reduce this, but never remove it.
None of this makes geofencing weak. It means you judge it over a few weeks across several fences, not on one fence's results in the first days.
What it costs and how to budget
Most campaigns start at $2,500 to $5,000 a month in media. A tight area works at the low end; a whole metro or several markets needs more.
That range is not a requirement. A campaign can run on less, it just cannot reach enough people often enough to judge whether it is working. If the budget is smaller, fewer fences with better reasoning behind them usually beats spreading thin across many.
Geofencing also pairs well with broader custom audience targeting, which can fill in reach that a handful of fences cannot provide on their own.
Common questions
How long do people keep seeing ads after they leave a fence?
The phones that entered become an audience, and ads continue for three or four weeks. That window covers the period when someone is still deciding, which is often when a reminder matters most.
Can I fence a competitor's store?
Yes, a competitor's location is one of the most common places to fence. People visiting are actively shopping, so your ads reach them while they compare options. The ads appear on the sites and apps they use, not on the competitor's property itself.
Do I need a physical location to use geofencing?
No. You can fence competitors, events, trade shows or neighborhoods without having a storefront. You just will not get store-visit counts, since there is no location of yours to measure. Impressions and clicks are still reported for each fence.
Can an agency resell geofencing to its own clients?
Yes. Agencies can sell it under their own brand through white-label geofencing, with the campaign work handled behind the scenes.
If you have a competitor, an event or a job site in mind, see how fences are drawn and reported on our geofencing digital display page.