Geofencing marketing shows an ad or a message to phones inside a boundary drawn around a real place, and the self-serve version most small businesses reach first is wider than the pitch suggests: Google Ads does not allow radius targeting under 1 km around any location. A fence of a few blocks around your shop is possible, but usually through your own app or a specialist vendor, and each of those routes carries its own privacy questions.
For a shop, restaurant or salon, three practical questions decide whether a geofence is worth running. Which kind of fence are you buying? Where does the location data inside it come from? And how will you count the people who walked in because of it, without taking a vendor’s dashboard on trust?
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What Geofencing Marketing Is and How It Works
Geofencing marketing triggers an ad, a push notification or a text message when a phone enters or leaves a virtual boundary drawn around a real place. Mailchimp’s guide to geofencing marketing describes boundaries that range from a few meters around a business to zones covering whole neighborhoods. Placer.ai lists the common shapes: a city or ZIP code, a polygon drawn around one building, a radius around a store, or a trade area built from the places a venue’s visitors actually come from.
The phone’s position comes from GPS, Wi-Fi, cellular data or Bluetooth, according to Adjust, and Google notes that GPS accuracy varies with the signal. None of it works on a phone that is not sharing its location. Mailchimp points out that people must have location services switched on and, depending on the delivery method, must have opted in to messages or installed the relevant app. That condition decides which route is open to you.
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Three Routes a Small Business Can Buy
A small business can reach a geofenced audience three ways: location targeting inside an ad platform, push messages from its own app, or a specialist geofencing vendor. They differ in who sees the message, what that person must already have done, and how tight the fence can be.
The Three Routes Compared
| Route | Who sees the message | What the person must have done | How small the fence can be |
|---|---|---|---|
| Google Ads location targeting | People Google judges to be in, regularly in, or interested in the area | Nothing extra; Google uses IP address and, depending on location settings, device location | No radius under 1 km |
| Your own app | People who have your app installed | Installed the app, allowed location access and opted in to notifications | Set by you, from a few meters upward |
| Specialist geofencing vendor | Phones the vendor’s location data places inside the fence | Shared their location with an app whose data reaches the vendor | Set by the vendor; ask for the minimum in writing |
For most storefronts without an app, the table reduces to one choice: a wide fence on a platform you may already use, or a tighter fence from a vendor whose data you have to vet. Neither is wrong. They answer different questions, and each carries the limits set out below.
The 1 Km Floor on Google Ads
Google Ads will not target a radius smaller than 1 km around any location, so a self-serve Google campaign cannot fence a single block. Google’s location-targeting help page says it only permits targets that meet minimum area and minimum user-count privacy thresholds, and that a small target may show ads intermittently or not at all. Mailchimp’s guide gives the example of a store limiting an offer to people within a 3-block radius. That is a reasonable goal, but it is not a fence Google Ads will draw.
The setting that matters more is who counts as being in the area. Google’s broad option, “Presence or Interest,” also reaches people elsewhere who have shown interest in your location; “Presence” reaches only people who are in, or regularly in, it. Google reports that advertisers in travel, real estate and education who switched from Presence to Presence or Interest saw 5% more conversions on Search campaigns, from its own data for May 21 to June 1, 2022. Those are not storefront categories. Google itself suggests Presence when you only want people in the location, and for a business that needs a customer standing nearby, that is the setting that matches the point of a geofence.
Fencing a Competitor’s Location
Both Mailchimp and Adjust list a competitor’s location as a place to draw a fence. What that buys is a chance to show your offer to people near a rival business. It does not give you that rival’s customer list, and on Google Ads the 1 km floor means the same fence also covers everyone else nearby, which can include your own regulars. The offer has to stand on its own, because the ad cannot know why a person was there.
Privacy Rules to Check Before You Draw the Fence
Location data is treated more strictly than most ad data, and Washington State makes some health-related geofences unlawful outright. Under RCW 19.373.080, part of Washington’s My Health My Data Act, it is unlawful to set a geofence around a provider of in-person health care when the fence is used to identify or track people seeking care, collect their health data, or send them messages or ads related to that care. If a vendor proposes fencing a clinic, a pharmacy or a medical office, stop and ask a lawyer before going further.
The federal side shows where the data itself can go wrong. In January 2024 the Federal Trade Commission announced its first settlement with a data broker over sensitive location data. It alleged that X-Mode Social and its successor Outlogic sold precise location data tied to mobile advertising IDs, data that is not anonymized and can match a phone to the places it visited, and that the company did not make sure the apps supplying that data had obtained informed consent. The order bars the company from selling or sharing sensitive location data. A small business buying a geofence campaign depends on the vendor to say where its location data came from, which is why we would not run a fence on data whose consent trail the vendor cannot describe.
Mailchimp’s own checklist covers the basics for an app or text program: get explicit consent before tracking a customer’s location, publish a clear privacy policy, offer a simple opt-out, collect only the location data you need, and follow the privacy rules of the place you are targeting.
Five Questions to Ask a Geofencing Vendor
- Where does your location data come from
- How did those people consent to sharing it
- What is the smallest fence you will draw
- Which places do you refuse to fence
- How will you report store visits
The first two questions come straight from the FTC case: a vendor that cannot name its data sources cannot tell you whether consent was given. The third tells you whether the fence really is tighter than the 1 km Google floor. The fourth should produce a list that includes health care locations. The fifth matters because a visit report built on the vendor’s own data is the vendor’s estimate, and you will want a count of your own beside it.
How to Run a First Geofence Test
A first geofence test needs one location, one offer, a code that only the geofenced ad carries, and a before-and-after count you can check yourself. Placer.ai’s geofencing guide lists unique promo codes, foot-traffic lift, dwell time and cost per acquisition as ways to measure a campaign. Of those, the promo code is the one you can verify at your own register without relying on anyone’s attribution model.
A First Geofence Test in Four Steps
- Pick one location and one offer
- Draw the smallest fence the platform allows
- Give the geofenced ad its own promo code
- Count redemptions against the weeks before
If the test runs through your own app, cap how often a person can receive a message. Mailchimp recommends frequency caps, a cooling-off period after each notification, and dwell-time rules that wait until someone has stayed in the area for a set time, because too many messages push people to opt out altogether. If the test runs on Google Ads, our guide on whether Google Ads is worth it for a small business covers the budget question to settle first.
Weighing a geofencing proposal? Bring the vendor’s pitch and your store location, and we will work through the five questions with you before you commit. Book a strategy call.
Sources
- Mailchimp, “Target Smarter: A Guide to Geofencing Marketing”, accessed 6 October 2026.
- Placer.ai, “Harnessing the Power of Geofencing Marketing: A Complete Guide”, accessed 6 October 2026.
- Alix Carman, Adjust, “The Proximity Power of Geofencing Marketing for Apps”, published 12 September 2023; accessed 6 October 2026.
- Google Ads Help, “Target Ads to Geographic Locations”, accessed 6 October 2026.
- Google Ads Help, “About Targeting Geographic Locations”, accessed 6 October 2026.
- Washington State Legislature, RCW 19.373.080, “Geofence Restrictions”, enacted 2023; accessed 6 October 2026.
- Washington State Office of the Attorney General, “Protecting Washingtonians’ Personal Health Data and Privacy”, accessed 6 October 2026.
- Federal Trade Commission, “FTC Order Prohibits Data Broker X-Mode Social and Outlogic from Selling Sensitive Location Data”, published 9 January 2024; accessed 6 October 2026.