Smart Bidding Exploration for PMax and Shopping: Test Plan
Google Ads has moved Smart Bidding Exploration beyond Search. On October 23, Search Engine Land reported that the feature now works in Performance Max and standard Shopping campaigns that bid on Target ROAS, a day after PPC News Feed spotted Google’s new help page laying out the rules. For ecommerce brands heading into Black Friday, it’s a real option for scaling, but it trades some return for reach. Here’s what changed, who qualifies and a seven-step plan to test it without losing control of margin.
What changed this week
Smart Bidding Exploration has been around for Search since 2025. It lets a Target ROAS campaign accept a lower return than its target in exchange for winning auctions on queries it was already eligible for but kept losing. The expansion adds two campaign types:
- Performance Max: exploration applies to the Search channel, covering extra searches within the terms the campaign can already match. PPC Land and Mojo Dojo note that feed-based Performance Max gets one setting that covers both Search and Shopping traffic.
- Standard Shopping: exploration can work across Search and Shopping traffic when the campaign runs on a Merchant Center product feed.
The timeline explains why it feels sudden. According to PPC Land, Google first said in May that retail campaigns would get the feature, opened a beta in June, and on October 16 Google’s Ads Product Liaison Ginny Marvin wrote in the Ads Decoded newsletter that it was fully launched for Performance Max with a product feed and for Shopping, and that it needs uncapped budgets to work properly. Launches often reach accounts gradually, so the practical test is whether the setting appears in your own campaign.
How Smart Bidding Exploration actually works
The key idea is that exploration changes bidding, not targeting. Google’s help page compares targeting to a pond and bidding to the fishing gear: the feature doesn’t add new fish, it helps you catch the ones you could already reach. Your eligible query pool still comes from your keywords, Dynamic Search Ads, AI Max or Performance Max setup.
When you switch it on, you pick a tolerance between 5% and 30%. That number lowers your effective target. Google’s own example: a 200% target ROAS with a 10% tolerance becomes an effective target of 180%. Google says actual ROAS should land within roughly 15% of that new effective target over one to two conversion cycles.
That raises an obvious question: why not just lower your ROAS target yourself? Google’s answer is that a lower target tends to raise bids evenly across every query, which usually doesn’t add much variety. Exploration tells the bidding system to push harder on specific traffic segments it thinks are under-served. Whether that beats a simple target cut in your account is exactly what a test should prove.
Who qualifies, and the traps to avoid
Several rules decide whether exploration runs at all, and two of them can switch it off quietly:
- Target ROAS only. It isn’t available for Maximize conversion value, which Google says is meant for finite daily budgets.
- No budget limits. Google says that if a campaign becomes budget-constrained, exploration is disabled in the background. A “Limited by budget” status during a sale period can end your test without warning.
- Campaign-level bid strategies for PMax and Shopping. Portfolio strategies only work with exploration in Search campaigns. Google warns that moving an opted-in Shopping campaign into a portfolio strategy automatically deactivates exploration.
- Search Ads 360. For standard Shopping and retail Performance Max with a feed, exploration isn’t compatible with Search Ads 360, so it has to be enabled and managed in Google Ads directly.
A 7-step test plan for ecommerce accounts
1. Pick campaigns that already hit target
Start with Shopping or feed-based Performance Max campaigns that consistently meet their Target ROAS and still have room to spend. Exploration accepts lower efficiency on purpose, so a campaign that’s already struggling is the wrong place to begin.
2. Fix the budget before you flip the switch
Check that each test campaign isn’t limited by budget, and leave headroom for the holiday spike. If you can’t afford uncapped spend through late November, wait or choose a smaller campaign.
3. Confirm the bid strategy setup
Move any retail test campaigns off portfolio strategies and onto campaign-level Target ROAS. If your team manages bids in Search Ads 360, plan to handle these campaigns in Google Ads for the length of the test.
4. Choose a tolerance you can afford
Work out your break-even ROAS from margin, not from the current target. If your target is well above break-even, a 10% to 15% tolerance is a sensible first step. Google discourages raising your target about 10% and then turning exploration on to cancel it out, because that limits what the feature can find.
5. Run it as an experiment where you can
A campaign experiment gives you a control and a trial arm to compare. Google suggests at least six weeks of exploration to judge impact, warns that ramp-up can take one to two weeks, and recommends waiting for at least 50 conversions before reading ROAS. If six weeks runs into peak season, decide now whether you’ll keep it on through Black Friday or pause before it.
6. Measure variety, not just ROAS
The point is new converting demand. Google points to Traffic Diversity metrics, meaning unique search categories with impressions, clicks or conversions, in campaign columns and the Bid Strategy Report, and a breakdown on the Search Terms Insights page. Google notes the Bid Strategy Report shows more categories because the Insights page groups private queries into one “Uncategorized” bucket. Judge success on incremental conversion value and new customers at a ROAS you can live with.
7. Don’t mine it for keywords
It’s tempting to pull new queries out of the reports and add them as exact match keywords. Google says this adds no performance or volume, because the campaign was already eligible for those searches. Use what you learn to improve product titles, feed attributes and landing pages instead.
Where it fits with AI Max and your other channels
Google calls AI Max and exploration complementary: AI Max widens the queries a campaign can match, and exploration helps it win more of them. Its suggested order is to turn on AI Max first, let matching settle, then add exploration. If you’ve just switched on AI Max, don’t stack both changes in the same week, or you won’t know which one moved your numbers. Our Google Ads AI Max audit covers how to check what AI Max is serving first.
Exploration also interacts with channel spend. If you’re setting priorities across Search, Shopping and Performance Max, read our guide to Google Ads channel prioritization before you uncap budgets. Paid demand also converts better when buyers already trust the brand, which is where earned coverage and press release distribution help.
The bottom line
Smart Bidding Exploration gives retail advertisers a controlled way to buy more reach by giving up a set slice of ROAS. It works best on profitable, uncapped campaigns, and it can switch off quietly if budgets tighten or bid strategies change. Test it with clear guardrails, measure new demand rather than just return, and decide before peak season how much efficiency you’re willing to trade.
FAQ
What is Smart Bidding Exploration in Google Ads?
It’s an opt-in setting for Target ROAS campaigns that lets Google bid more aggressively on searches you’re already eligible for, in exchange for accepting a ROAS 5% to 30% below your target.
Does Smart Bidding Exploration work with Performance Max and Shopping?
Yes. Google now supports it in Performance Max, on the Search channel, and in standard Shopping campaigns, which can explore Search and Shopping traffic when they use a Merchant Center feed.
Can I use it with a portfolio bid strategy?
Only for Search campaigns. Performance Max and Shopping need campaign-level Target ROAS, and moving an opted-in Shopping campaign into a portfolio strategy turns exploration off.
How long should I test Smart Bidding Exploration?
Google recommends at least six weeks, allows one to two weeks for ramp-up, and suggests waiting for at least 50 conversions before judging ROAS.
Is it the same as lowering my ROAS target?
No. Google says lowering the target raises bids evenly across queries, while exploration targets specific traffic segments to add variety. A controlled experiment is the best way to see which works better for your account.
Want help setting up a safe exploration test before the holidays? See our Google Ads management service, browse the Tech Hustler blog, explore all services or book a free strategy call.
Sources: Search Engine Land (Oct 23), PPC Land, Google Ads Help: Smart Bidding Exploration FAQ, Mojo Dojo, Google Accelerate: Smart Bidding Exploration on Shopping
