Getting Your Ads Ready for the Q4 Peak

The last three months of the year are when ad inventory is worth the most. Advertisers spend heavily from October through December, auctions get more competitive, and the same app or site can earn noticeably more per impression than it did in the summer.

That only helps if your setup is ready to take it. A crash introduced by a November update, a consent message that silently stops working, or a missing ads.txt line can cost you more in a peak week than in a quiet month. The work that pays off in Q4 mostly happens in September and early October.

This guide covers why the quarter pays more, what to check before the peak, how to handle traffic and placements, and which changes to hold back until January. Dollar figures are estimates from our benchmark tables, and any seasonal percentages are hypothetical.

Why the final quarter pays more

Ad prices are set by auctions, and auctions reward competition. In the final quarter, retailers chase holiday shoppers, game and app studios run user acquisition campaigns around new releases and gift-card season, and brands spend what is left of the annual budget. More bidders chase each impression, so the price that wins goes up.

The pattern usually builds through October, rises again in late November around the big shopping weekends, and holds into December before falling back in January. Our guide to why ad revenue drops in January covers the other side of the curve.

To put a hypothetical number on it, take a Tier 1 Android game on AdMob showing 30,000 rewarded impressions a day. At our benchmark eCPM of about $12.00, that earns $360. If Q4 demand lifted eCPM by an illustrative 20%, to $14.40, the same impressions would earn $432. The extra $72 a day comes from price alone, which is why protecting volume during the peak matters so much.

September: audit everything

Use September to find problems while they are still cheap to fix.

• Stability. Check crash-free rates and app-not-responding rates. Ad SDKs are a common source of crashes, and a crash in the middle of an ad loses the impression and sometimes the user.
• SDK and adapter versions. Bring your ad SDKs and mediation adapters up to date now, not in November. Older versions can lose access to newer demand or bidding features.
• Ad unit health. Go through every ad unit and placement. Confirm each one is requesting, matching and showing as expected. Reading the AdMob report explains which ratios to check.
• Mediation setup. If you mediate, make sure each network is live and receiving traffic. Our comparison of bidding and waterfalls helps if you are still deciding how to structure the stack.

October: tidy the details that block demand

Small configuration gaps quietly remove buyers from your auctions. Fix them before the busiest weeks.

ads.txt and app-ads.txt

Authorised seller files tell buyers which companies may sell your inventory. If a line is missing for a network or reseller, some advertisers will not bid. Check your file against what each partner asks for. Our guides to app-ads.txt on Google Play and the Apple App Store walk through the setup. The IAB Tech Lab maintains the standard.

Consent

In regions that require consent, users who decline or never see a message may only receive limited or non-personalised ads, which usually pay less. Test your consent message on a clean install in each region you serve and confirm it still appears and records choices correctly. See consent messages setup for the details.

Floor prices

Floors set months ago may not match current demand. A floor that is too low leaves money on the table during the peak. One that is too high cuts fill, and fill falls by more than you expect when you raise floors aggressively. Review them in early October, adjust in small steps, and then leave them alone. Our guide to choosing floor prices sets out a method.

Inventory and placements

The quarter rewards inventory that already works. Test new placements in September so you have results before the peak, then keep the winners and drop the rest.

For apps, make sure rewarded placements are easy to find and offer something players want, since rewarded video carries the highest eCPM in our tables. If interstitials are part of your mix, confirm your caps and cooldowns are sensible. The trade-offs are covered in rewarded or interstitial ads.

For sites, the peak is a good time to make sure the formats you already run are viewable and well placed rather than adding more units. Too many ads on a page can slow it down and reduce what each slot earns. Our guides on website ad formats and ads and Core Web Vitals cover the balance.

Traffic during the peak

Higher prices make every visit or session worth more, so it is a sensible time to publish seasonal content, send a newsletter, or run in-app events that bring lapsed users back. Plan these for when prices are highest rather than spreading them evenly through the year.

Be careful about where new traffic comes from. Buying cheap traffic or running promotions that attract low-quality visits can trigger invalid traffic checks, and the resulting deductions can wipe out the gain. If a source looks too good to be true, read invalid traffic explained before using it.

Avoid risky changes near the peak

Set a change freeze for the weeks around late November and December. During that window, avoid:

• Major SDK upgrades or switching mediation platforms.
• Large floor price changes.
• New ad formats or placements that have not been tested.
• Big redesigns of the screens or pages where ads appear.

If something must ship, release it to a small share of users first and watch the numbers for a few days. Keep a rollback plan for every release. A problem found in a peak week costs more than the same problem in February.

Measuring the quarter

Write down your baseline before October: eCPM by format and country, fill, impressions per user and revenue per user. During the peak, compare each week with the same week last year where you have it. After the quarter, note what worked and what you would change, since the same calendar comes round again.

Use a range rather than a single number when you forecast. Our tables run from 0.7x to 1.35x around each central figure, and the AdMob revenue calculator and AdSense revenue calculator let you model both ends. The AdMob help centre and AdSense help centre are the official references for policies and reporting.