Google bundled three bidding and budgeting changes into one June 16, 2026 rollout, and most of the attention went to the August 17 change to how budget-limited campaigns hit their targets. Two other parts of that bundle matter just as much and got far less coverage: a Promotion Mode beta and an expansion of Smart Bidding Exploration to Performance Max. Both are now live in beta. Here is what each one actually does and how to use them without handing your ROAS to the algorithm unsupervised.
Promotion Mode lets you schedule a temporary, self-reverting widening of ROAS tolerance and extra budget around a sale or launch window, for Search and Performance Max. Smart Bidding Exploration, previously Search-only since 2024, now lets Performance Max bid on queries with plausible but unproven conversion histories inside a tolerance band you set.
What is Google Ads Promotion Mode?
Promotion Mode is built for the exact problem every advertiser hits before a flash sale, a holiday ramp or a product launch: you want to spend more and accept a temporarily lower ROAS for a defined window, then snap straight back to normal once it ends. Historically that meant manually raising budgets and loosening Target ROAS or Target CPA, then remembering to revert both when the promotion finished, which is where a lot of post-sale overspend quietly comes from.
With Promotion Mode, you set a date range, a widened ROAS tolerance and extra daily budget once, and the campaign automatically returns to its baseline settings when the window closes. It launched in beta for Search and Performance Max campaigns as part of the June 16, 2026 update.
What is Smart Bidding Exploration for Performance Max, and why does it matter now?
Smart Bidding Exploration has existed for Search campaigns since 2024, giving advertisers a way to set a ROAS tolerance band that gives Google's bidding algorithm room to bid on search queries it has not seen convert before but judges plausible based on pattern matching against queries that have. The expansion to Performance Max is significant because PMax already pools Search, Shopping, Display, YouTube and Maps inventory into one black-box campaign, and Exploration adds another layer of algorithmic latitude on top of an already opaque system.
| Feature | What it changes | Available for | Risk if left unmonitored |
|---|---|---|---|
| Promotion Mode | Temporary ROAS tolerance widening and extra budget, on a defined date range, auto-reverting | Search, Performance Max (beta) | Overspend during the window if the date range is set too wide |
| Smart Bidding Exploration | Ongoing ROAS tolerance band that lets the algorithm test unproven queries | Search (since 2024), Performance Max (new, 2026) | Sustained spend on lower-quality queries if tolerance is set too loose |
| Bidding target behavior change (Aug 17) | Budget-limited campaigns now adhere strictly to bidding goals rather than drifting | Target CPA, Target ROAS, Demand Gen Target CPC | Higher CPA for accounts whose targets sit well above recent performance |
Read our full breakdown of that third item, the August 17 bidding target change, if you have not already audited your campaigns against it. It is a separate mechanism from the two below, but all three shipped in the same bundle and interact with each other inside the same account.
Should you turn on Smart Bidding Exploration for Performance Max?
It depends on how much margin your account has to absorb inefficient spend while the algorithm tests. Accounts with strong, long conversion histories and healthy margin are the best candidates, because Exploration needs a solid pattern to extrapolate from and a margin cushion to survive the queries that do not pan out. Thin-margin accounts, or ones already missing target CPA, should watch how the feature performs for others before opting in.
Start Exploration on a single, well-performing campaign rather than account-wide. Set a tight tolerance band, watch it for two full weeks against blended ROAS, not just the platform's reported number, and only widen the rollout once you can see the exploration spend clearly separated from your core converting queries in the search terms report.
How to use Promotion Mode without wrecking ROAS
- Set the date range to the actual promotion window, not a buffer either side. Every extra day at widened tolerance is extra spend at lower efficiency.
- Decide your acceptable ROAS floor for the window before turning it on, not after watching the first day of results.
- Check performance daily during the window instead of waiting for it to close and auto-revert. A bad first 48 hours is a signal to intervene, not to wait out.
- Compare blended ROAS across your whole funnel, not the platform-attributed number alone, since a widened tolerance window is exactly when platform and blended numbers diverge most.
- After the window closes, review whether the campaign actually reverted cleanly. Beta features occasionally need a manual nudge back to baseline.
What does this mean for a small or mid-size advertiser?
For most advertisers running performance marketing without a dedicated in-house PPC team, Promotion Mode removes a genuine annoyance: remembering to loosen and then re-tighten targets around every sale. That is worth adopting for defined, short windows once you trust the auto-revert. Smart Bidding Exploration is a different call. It is a permanent loosening of control in exchange for algorithmic upside, and it deserves the same scrutiny you would give any change that hands the platform more discretion over your spend.
Treat both features as tests, not defaults. Run Promotion Mode on your next scheduled sale and measure the lift against last year's manual process. Run Exploration on one campaign for a month before deciding whether it earns a place across the account. Google's own rollout language calls both beta for a reason.
The takeaway
Promotion Mode and the Performance Max expansion of Smart Bidding Exploration are the quieter half of Google's June 2026 bidding overhaul, and they are genuinely useful if you set boundaries before turning them on. Promotion Mode solves a real operational headache around sales events. Exploration trades control for algorithmic reach, which is a reasonable trade for accounts with margin and historical data, and a risky one for accounts without either. Test both in isolation, watch blended numbers, and do not let a beta feature run further than the window you set for it.
Frequently asked questions
What is Google Ads Promotion Mode?
Promotion Mode is a beta feature for Search and Performance Max that lets advertisers schedule a temporary, self-closing widening of their ROAS tolerance and add extra daily budget across a defined date range, such as a flash sale or holiday window, then automatically reverts to normal settings when the window closes.
What is Smart Bidding Exploration for Performance Max?
Smart Bidding Exploration lets an advertiser set a ROAS tolerance band that gives the bidding algorithm room to bid on queries with plausible but unproven conversion histories. It has been available for Search campaigns since 2024 and is now expanding to Performance Max.
When did Google roll out Promotion Mode and Smart Bidding Exploration?
Google announced a bundle of three bidding and budgeting changes on June 16, 2026: the Promotion Mode beta, the expansion of Smart Bidding Exploration to Performance Max, and a separate bidding target behavior change for budget-limited campaigns that took effect August 17, 2026.
Is Promotion Mode risky for ROAS?
It can be if left unmonitored, because widening ROAS tolerance by definition allows less efficient conversions through. The risk is manageable if you set a defined date range, monitor daily rather than waiting for the window to close, and compare blended ROAS against your pre-promotion baseline, not just platform-reported ROAS.
Should every advertiser turn on Smart Bidding Exploration?
No. It suits accounts with strong historical conversion data and margin to absorb some inefficient spend while the algorithm tests new queries. Thin-margin accounts or ones already struggling to hit target CPA should wait and watch other advertisers' results first.
Does Promotion Mode replace manual campaign restructuring for sales events?
For most small and mid-size advertisers, yes, it removes the need to manually raise budgets and loosen targets before a sale and remember to revert them after. Larger accounts with complex campaign structures may still prefer manual control for precision.