How long a billboard campaign should run, and why one month rarely tells you much

Long enough for the same drivers to see you many times

A billboard campaign should run long enough for the same commuters to pass it many times, because outdoor works through repetition, not a single sighting. For building a name, that usually means thinking in months rather than weeks. For a dated event or offer, it means going up early enough that people see the board repeatedly before the date. Whatever the goal, decide the length and how you will judge it before the board goes up, and do not cancel after the first quiet week.

I plan campaign lengths with owners every week at Lamar's Dallas–Fort Worth Billboard Office, and contract terms vary by board and format, so I show the options for each board when I quote. What follows is how I help owners decide what they actually need.

Why repetition does the work

Most of the people who pass a board are not in the market for what it advertises that day. That is fine, and it is the point. A billboard puts your name in front of commuters on the route they drive day after day, so that when they do need what you sell, your name is already familiar. That familiarity is built a little each time they pass.

The industry measures this with two ideas: reach, how many different people see the board, and frequency, how many times they see it. Geopath, the industry's audience measurement company, reports reach and frequency alongside its impression estimates. A short campaign may reach plenty of people once or twice. A longer one reaches many of the same people again and again, and that repetition is what turns a passing glance into a name people remember.

Think about how you learned the names of the businesses along your own commute. You probably never decided to remember them. You passed them enough times that they became part of the scenery, and then one day you needed a dentist, a mechanic or a lawyer and one of those names came to mind first. A billboard campaign tries to earn that same position on purpose, and it needs the same ingredient: time on the route.

Matching the length to the goal

There is no single right length, because different goals ask for different things. These are the patterns I use as a starting point when I plan with an owner.

• Building a brand or a name across the market: an ongoing presence, measured in months, so you stay in drivers' heads between their needs
• New location or grand opening: start before the doors open and keep going well after, so drivers learn you are there and the habit forms
• Event or deadline: go up early enough that commuters see it many times before the date, and consider digital so the message can count down
• Seasonal business: cover the run-up to your season, when people are starting to think about the purchase, not only the peak weeks
• Hiring: as long as the openings last, ideally on digital so the roles can change as positions fill
• Entering a new part of the metro: long enough in that corridor for the new audience to recognize you before you judge the result

Why a short flight usually disappoints

The pattern I see most often goes like this. An owner books a short run to try outdoor, the first weeks feel quiet, and the board comes down just as drivers are beginning to notice it. The owner concludes billboards do not work. What actually happened is that the campaign paid for the familiarity stage and ended before the payoff stage.

If budget is tight, I would rather see a smaller board held for longer than a premium board for a few weeks. A modest location your customers pass every day, kept up long enough, usually does more for a local business than a prominent spot that disappears before anyone remembers it. My guide on what a billboard costs and what sets the price explains how length and location trade off in a quote.

It also helps to agree on the length with everyone involved before the board goes up. If a business partner or a spouse expects results in two weeks and you planned for several months, the pressure to cancel early will arrive right on schedule. Write the plan down, including what you expect to see at each checkpoint, so the decision to continue or stop is made on the numbers rather than on nerves.

How the format changes the timeline

On a static bulletin, your ad is produced and installed, then it stays for the run. That makes static a natural fit for longer campaigns with one steady message. If you want a static presence in more than one area over a long campaign, Lamar's rotary bulletin package moves your ad from one bulletin location to another at stated intervals, usually every 60 to 90 days, so one campaign is seen by drivers in different parts of the market.

On a digital billboard, the length of the campaign and the message are separate decisions. According to Lamar, you can change your message weekly, daily, hourly or in real time with no production cost. You can hold your place in the rotation for months and keep the content fresh, which suits businesses that would otherwise worry about a long campaign going stale.

Keeping a long campaign fresh

Owners sometimes worry that people will stop noticing a board that stays the same. Some refresh is healthy on a long campaign, but change for its own sake can work against you, because consistency is what makes a board recognizable. The goal is to keep the brand constant and refresh the message around it.

On digital, that is easy: rotate seasonal messages, swap in a new offer or run a countdown while the logo, colors and layout stay the same. On static, plan a new creative at a natural point, such as a change of season or a rotary move to a new location, rather than mid-run. Our designers can build a family of ads that look related, so a change feels fresh without losing what drivers already know.

When to judge the result

Set checkpoints before the board goes up, and decide what you will look at at each one. Early on, look for signs of awareness: more people searching your business name, more website visits from the area around the board and new customers who mention they have seen you. Later, look at the business result: calls, appointments, sales and new customers from the areas the board reaches.

Comparing against the same period before the campaign, or against a similar area without a board, makes the picture clearer. I cover the tools in my guide to measuring whether a billboard is working. The key point for timing is simple: judge the campaign at the checkpoints you set, not on the feeling of a single week.

Remember too that the effect of a board often continues after it comes down. People who learned your name during the campaign still remember it when they need you months later, and they may not mention the board when they call. That is one more reason to ask every new customer how they heard about you, and to keep watching the numbers for a while after the run ends instead of closing the book on the last day.

How location and length work together

A good location shortens the time it takes to see results, because more of the right people pass it more often. A board on the route your customers drive every day builds familiarity faster than one they pass occasionally. That is why I spend so much time on location before talking about length.

If you are weighing several boards, my guide on choosing a billboard location in DFW shows how I compare them. The best plan is usually the right board for long enough, rather than more boards for too short a time.

Signs it is time to extend, change or stop

At the end of a run, look at what the data says before deciding, and give yourself a few days to review it rather than deciding on the last afternoon. These are the signals I look for with owners when we sit down to plan what comes next.

• Extend: searches for your name, calls or new customers from the area are rising and the trend has not leveled off
• Change the message: awareness is growing but people are not acting, which often points to the offer or the call to action
• Change the location: after a fair run, nothing has moved and customer data shows the board's audience is not your customers
• Stop or pause: the goal has been met, such as a filled hiring need or a finished event, and there is no next message ready

Planning the right length with me

When we talk, tell me your goal, any dates that matter and roughly what you want to invest. I will show you the boards that fit, the terms available on each and how the length would change the result and the price, so you can decide with the trade-offs in front of you.

If your goal is better served by a shorter, focused digital campaign, I will say so. If it needs a longer run than you planned, I will explain why before you commit, because a campaign that ends too early helps nobody.

Questions people ask me