09/21/2026
Heads up for anyone running a Shopify store or managing ads for one.
Shopify is changing what counts as a "session" this week, September 21 through 23. Sessions now time out after 30 minutes instead of resetting at midnight UTC (5pm Pacific, so evening shoppers were getting split in two). Sessions with no pageview count now, like someone tapping an abandoned-cart text and landing straight in checkout. And known bot traffic is being filtered out by default, retroactively back to October 2025.
Orders, revenue and customer counts don't change. But everything divided by sessions does: conversion rate, bounce rate, add-to-cart rate, all of it. Some stores will see CVR go up, some will see it go down, and it has nothing to do with how the ads are performing.
Your Meta, TikTok and Google reporting isn't affected. Pixel and CAPI events, purchases, ROAS, CPA, all the same as last week. This only touches the Shopify-side numbers.
Where it gets messy: Shopify CVR is the number a store owner looks at before they message their media buyer. Any before-and-after comparison that crosses this week is comparing two definitions, not two performances. If you're testing a landing page right now, use orders per ad click instead. And if the gap between Meta link clicks and Shopify sessions suddenly looks different, that's the bot filter, not a tracking problem.
What to do: treat this week forward as the new baseline (Shopify's own advice), note the break on any dashboard showing sessions or CVR, and lean on click-based or platform-side conversion rates for the next several weeks.
If you're on a headless or Hydrogen build, watch for a notice from Shopify about session cookie handling. That one needs a developer.