Google's Performance Max (PMax) campaigns are designed to automate and optimize ad delivery across all Google channels. The assets (images, headlines, descriptions) you provide are mixed and matched by Google's AI to create the best-performing ad combinations.
Here's a concise answer on how often you should refresh them:
You should refresh images, headlines, and descriptions in PMax asset groups based on performance and relevance, rather than a fixed schedule.
Key considerations:
Monitor Asset Performance: Google Ads provides an "Assets" report within your PMax campaign. Look for assets rated "Low" or "Poor" in performance. These are the first ones to replace.
Allow Learning Phase: After adding or changing assets, give Google's AI 2-3 weeks (or even 4-6 weeks for full optimization) to learn and gather enough data before making major decisions. Changing too frequently will disrupt this learning.
Seasonal/Promotional Relevance:
Evergreen assets: For core products/services, you might only need to refresh these quarterly (every 3 months) at most, or when performance drops significantly.
Seasonal/promotional assets: For specific sales, holidays, or new product launches, create new asset groups or update existing ones to feature these timely creatives. Once the season/promo ends, you can pause or remove those specific assets/groups.
Content Refresh: If your brand overhauls its messaging, launches significant new products, or generates a lot of new, high-quality content, it's a good time to update relevant assets.
Ad Strength: Aim for an "Excellent" Ad Strength rating for your asset groups by providing a wide variety and quantity of high-quality assets (e.g., up to 20 images, 15 headlines, 5 descriptions, 5 videos). Regularly check this rating.
In short: Don't just set a rigid calendar. Focus on replacing underperforming assets when data suggests it's time (after sufficient learning), and always update for major seasonal or promotional relevance.