Shopify Just Changed How It Counts Sessions.

If you opened your Shopify Analytics this week and something looked off, you're right to assume so.

Between 21 and 23 September 2026, Shopify rolled out a change to how it measures sessions. Because sessions feed into a long list of other metrics (conversion rate, add-to-cart rate, bounce rate and more), a lot of stores will see those numbers move this week, even though nothing has changed with their customers or their store.

In this post I explain what changed, what it means for your reporting, and how to make sure nobody on your team, or your clients' teams, draws the wrong conclusion from it.

The short version

Your orders, sales and customer counts are not affected. Your session-based metrics probably are. If your conversion rate jumped or dropped this week and your revenue didn't, the most likely explanation is the measurement change, not your store.

What Shopify actually changed

There are three changes, and they pull your numbers in different directions.

Bots are now filtered out by default.

Sessions Shopify identifies as bots are now excluded from session-related reports unless you choose to include them. Where a report has the "Human or bot session" filter, you can switch bot traffic back on. The Homepage and Live View exclude bots permanently, with no option to change it. This change will usually reduce your session count.

Sessions no longer reset at midnight UTC.

Previously, a shopper browsing at 11:50pm UTC and still browsing at 12:10am would be counted as two sessions. Now a session simply ends after 30 minutes of inactivity, whatever the time is. This also reduces session counts slightly, and for UK stores it matters more than you might think, because midnight UTC lands right in the late-evening browsing window during British Summer Time.

Some sessions without a pageview now count.

If a customer clicks a cart link and goes straight to checkout without loading a normal storefront page, Shopify can now count that as a session. This one increases your session count, particularly for stores that use cart links in email, SMS or influencer campaigns.

Because these effects offset each other, there's no universal answer to "how much will my numbers change?" A store with heavy bot traffic might see sessions fall noticeably. A store that relies on direct-to-checkout links might see them rise.

Why your conversion rate may have changed

Conversion rate is orders divided by sessions. Change the bottom half of that sum and the result changes, even if orders stay exactly the same.

Here's a simple illustration. Say your store had 40,000 sessions and 1,000 orders last month: a 2.5% conversion rate.

If 4,000 of those sessions are now identified as bots and removed, you're left with 36,000 sessions and the same 1,000 orders. Your conversion rate is now roughly 2.78%.

Now say the new rules also pick up 1,500 cart-link sessions that were previously invisible. You're at 37,500 sessions, and your conversion rate settles around 2.67%.

Neither number is "right" or "wrong". They're measuring slightly different things. Shopify's own guidance is that a higher or lower conversion rate after the update isn't inherently good or bad, and should be treated as a new starting point.

The metrics to watch

The change can affect :

• sessions,

• conversion rate,

• add-to-cart rate,

• reached checkout rate,

• checkout conversion rate,

• bounce rate,

• pageviews per session,

• average session duration and,

• online store visitors.

It also flows through to acquisition, behaviour, marketing, search and product recommendation reports, plus any custom reports built on session data.

The real risk: bad decisions from good-looking data

The measurement change itself is sensible. Cleaner bot filtering and more accurate session boundaries give a truer picture of real shoppers. The danger is in how people interpret the shift.

CRO tests overlapping the rollout.

If you launched a new product page, checkout tweak or theme update in mid-September, any before-and-after comparison is now contaminated. A lift might be the update; a dip might be the update. Before calling a winner or rolling something back, check orders and revenue, and if possible, rerun the comparison using only post-update data.

Month-on-month and year-on-year reports.

September vs August is no longer a like-for-like comparison for session metrics. Year-on-year is messier still, because Shopify only classifies bot sessions from 7 October 2025 onwards, so anything earlier can't be filtered the same way.

Dashboards that outlive the people who built them. Six months from now, someone will look at a chart, see a step change in late September, and ask what happened. Annotate it now.

If you use GA4 comparisons remain the same:

How this affects the GA4 comparison

Many merchants have long treated Google Analytics 4 as the "real" view of traffic, partly because Shopify's session numbers behaved differently. This update narrows that gap. GA4 already used a 30-minute inactivity timeout, didn't split sessions at midnight and excluded known bots automatically, so Shopify is now much closer in approach.

The two tools still won't match exactly. They use different bot detection, different tracking methods and different responses to cookie consent, which is a big factor for UK and EU stores. A sensible split is, and how we do it here at Dashworx, is to use Shopify for conversion rate, since it's calculated against your real order count, and GA4 for attribution, journey analysis and campaign performance, where it offers far more depth and feeds into Multi-touch attribution if needed. Track trends within each tool rather than trying to force the numbers to agree.

What to do this week

If you use Shopify for your analytics, start a fresh at 21 September 2026 for all reports and add an annotation.

Also, if you've had a message from Shopify about your storefront (for example about session cookie rotation, or a Hydrogen or custom headless build), speak to your developer. Most merchants don't need to take any technical action, but those setups can need changes to track sessions correctly.

The bottom line

Shopify's analytics are getting more accurate, and that's good news.

But whenever the rule changes, old measurements stop lining up with new ones. Treat late September as a fresh baseline, lean on orders and revenue as your anchor, and make sure everyone reading your reports knows why the line on the chart moved.

If you'd like help reviewing your eCommerce and Marketing reporting, reconciling it with GA4 or updating your dashboards for the new baseline, get in touch with the Dashworx team.