On 21 September 2026, Shopify began rolling out an update to session measurement in Shopify Analytics. Sessions and conversion rate can look different after the update, even without a corresponding change in orders or sales.
For Shopify merchants preparing for peak season, the priority is to understand the new baseline before interpreting a reporting change as a performance improvement or decline.
What actually changed
Shopify’s announcement describes three improvements to the sessions experience:
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Default bot filtering: Identified bot sessions are excluded from session-related reports by default, with an option to include them in reports that support the Human or bot session filter;
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More consistent classification: Shopify is improving how it classifies bot and system traffic;
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Shopper journeys without pageviews: Valid sessions can be counted even without a standard pageview, such as a customer going directly to checkout from a cart link.
Shopify’s session measurement guidance also explains that continued activity no longer creates a separate session simply because it crosses midnight Coordinated Universal Time (UTC). A session ends after 30 minutes of inactivity.
The announced rollout ran from 21 to 23 September 2026. The effect on each store’s reports depends on its traffic and the sessions affected.
Which metrics are affected
Shopify identifies several metrics that can look different after the update:
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Sessions and online store visitors: Reported counts can change;
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Conversion rate: The rate can rise or fall as the sessions included in the calculation change;
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Add-to-cart and checkout rates: Add-to-cart rate, reached checkout rate and checkout conversion rate can change;
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Engagement metrics: Bounce rate and pageviews per session can change;
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Searches: Search reporting can also be affected.
Shopify’s analytics fields reference defines conversion rate as sessions that completed checkout divided by total sessions. It is not simply total orders divided by sessions.
Excluding non-converting bot sessions can increase conversion rate. Counting additional shopper sessions without pageviews can decrease it. There is no guaranteed direction for every store or metric.
Total orders, sales, and customer counts are not changed by this measurement update. However, actual business performance can still change during the same period.
Why this matters more than it seems
The update matters because a change in reported metrics can be mistaken for a change in customer behaviour, affecting how merchants assess performance and plan ahead.
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Performance comparisons: Session-based metrics measured before and after 21 September use different measurement methods. A higher conversion rate after the rollout does not, by itself, demonstrate that a campaign or checkout improvement worked;
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Peak season planning: Q4 targets based on historical conversion rates can become harder to interpret against the new baseline. An apparent improvement or decline could partly reflect the measurement change rather than progress towards a business goal;
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Historical reporting: Historical data has not been deleted or reprocessed, but bot filtering can change how it appears in reports. Even consistent filter settings do not make the old and new session measurement methods directly comparable;
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Automated reporting: Dashboards, apps and alerts that rely on Shopify session metrics can register a movement caused by the update. Where those figures feed performance assessments or decision rules, the movement could be interpreted as a business change.
The distinction matters: a reporting shift and a genuine change in trading performance can happen together, but they do not mean the same thing.
What merchants should do this week?
On Tap recommends the following reporting checks before using the updated figures to assess peak season performance:
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Document your baselines: Export relevant session-based metrics for the previous 30, 60, and 90 days where useful. Record the date ranges and filter settings, and annotate the September rollout in your reporting;
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Review peak season targets: Compare your existing assumptions with results under the updated measurement. Recalibrate targets only where the observed difference justifies it;
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Audit automated reporting: Check BI dashboards, agency reports, and performance alerts that consume Shopify session data. Ask app developers how their tools use these metrics, and brief your marketing team on the change;
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Revisit decisions selectively: Review recent conclusions about checkout optimisation or traffic quality where session-based metrics were a deciding factor. Check whether those conclusions still hold alongside orders and sales;
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Check the Human or bot session filter: Use the bot filtering controls in supported reports to investigate traffic composition. Bot classification applies to sessions from 7 October 2025 onwards, so older periods cannot be filtered on the same basis.
A “human” classification is not a guarantee that every included session came from a person: Shopify notes that some sophisticated automated traffic might not be identified immediately.
These are reporting recommendations, not a requirement to rebuild your analytics setup. Shopify says most merchants do not need implementation changes for this update. If you received a storefront-specific message, work with your technical team or agency on the relevant guidance.
The bigger picture
This update follows Google’s 20 August 2026 announcement about Google tag and Google Tag Manager. Both developments reinforce the value of reviewing vendor changes, but their effects differ: Google says its Google tag upgrade does not change the tag’s in-page behaviour.
For Shopify merchants heading into peak season, a changed conversion rate needs context. Review session-based trends alongside orders, sales and customer counts before deciding whether performance has improved or declined.
The practical lesson is to document measurement changes, maintain clear reporting definitions and establish a baseline that your team understands. That gives merchants a firmer basis for evaluating campaigns and setting targets.
About On Tap
On Tap is an eCommerce consultancy helping merchants make better decisions with accurate data.
If you need help reviewing your analytics and peak season targets, get in touch.
