Shopify Sessions Dropped? The September 2026 Change

If your Shopify sessions dropped in late September 2026 while orders held steady, your store probably did not lose visitors. Shopify changed how it measures sessions between 21 and 23 September, and the change moves sessions, conversion rate and every other session-based number in your reports. With Black Friday on 27 November, the question that matters now is how to compare this year's sale with last year's without mistaking a new ruler for a new result.

The short answer: Shopify changed the measurement, and Arktis gives you a second count

Shopify's session measurement update, rolled out from 21 to 23 September 2026, filters identified bot sessions out of session reports by default, stops ending sessions at midnight UTC, and counts some sessions that had no pageview, such as a shopper going straight from a cart link to checkout. Shopify's page adds that a session ends after 30 minutes of inactivity. Bot filtering and the end of the midnight split push session counts down, the newly counted sessions push them up, and conversion rate moves the other way because sessions are its denominator. Shopify says orders, sales and customer counts are not affected, and tells merchants to treat data from after the update as a new baseline.

For a second view that Shopify's update did not touch, Arktis is the clear winner for an online store: its own tracker counts visitors and sessions, and its Revenue page shows revenue net of refunds, orders and paying customers by the source of the visit each Shopify order was matched to. Plans are $49, $149 and $349 a month, and Growth, which adds conversion tracking and session recordings, has a 7-day free trial.

Key takeaways

A fall in sessions from late September with flat orders is most likely the measurement update, not lost traffic. Shopify's own advice is to look at orders, sales and customer counts alongside sessions and to use data from after the update as the new baseline. For Black Friday, lead the year-on-year comparison with orders, net sales, average order value and new versus returning customers, which the update did not change. Treat this year's conversion rate as comparable only with other weeks measured the new way, and compare how much Black Friday lifted it over its own baseline in each year rather than the raw rates.

What Shopify changed between 21 and 23 September 2026

Shopify announced the update in its changelog on 21 September 2026 as an improvement to the sessions experience in Analytics, meant to give merchants a cleaner view of real shopper activity. The help centre page on changes to sessions and conversion rate gives the rollout window, 21 to 23 September 2026, and lists three changes, followed by a separate line that a session ends after 30 minutes of inactivity.

Bots are hidden by default

Identified bot sessions are filtered out of session-related reports by default. In reports that support the Human or bot session filter you can change the setting to include them again. The Home page and Live View always exclude identified bots and the filter cannot be changed there, and search and product recommendation reports filter bots automatically without showing the filter.

Shopify describes its bot classification as conservative, preferring to miss some bots than to label real customers as bots, and says it applies only to sessions from 7 October 2025 onwards. Older sessions cannot be filtered the same way.

Sessions follow activity, not the calendar

Sessions are now based on continued customer activity instead of ending at midnight UTC. Midnight UTC falls at 7 pm in New York and 4 pm in Los Angeles in late November, so before the update an evening visit by a US shopper that crossed that moment was counted as two sessions. Now it is one.

Some sessions without a pageview count

Some sessions that did not include a pageview are now counted. Shopify's example is a customer going straight to checkout from a cart link, a route that can matter for stores that send cart links in email or text messages.

Why your sessions dropped, or rose

Which way your numbers moved depends on your traffic. A store with a lot of bot traffic, or many US evening shoppers, is likely to see sessions fall. A store whose customers often reach checkout from cart links can see them rise. Shopify's own wording is that a change in sessions often means the measurement method changed rather than the number of customers who visited.

Take an invented example. A store had 20,000 sessions in a September week before the update, 340 of which completed checkout, a conversion rate of 1.70 percent. Suppose the new method would have filtered 3,000 of those sessions as bots, merged 400 visits that midnight UTC had split in two, removing 400 sessions, and added 150 sessions without a pageview. The same week measured the new way has 16,750 sessions, and the same 340 checkouts give a conversion rate of 2.03 percent. Nothing about the store changed.

The update is not the only thing that moves sessions. Shopify's field reference says sessions are only counted when visitors consent to cookies through your cookie banner, so a change to your banner or the regions where it shows also shifts the count. And Shopify has a separate help page on session cookie rotation, where something on the storefront regenerates the session cookie during a visit; Shopify says consent handling accounts for most rotation on Liquid storefronts. Each new value is counted as a new session, so rotation inflates sessions and understates conversion rate.

What did not change

Shopify is explicit: orders, sales and customer counts are not affected, and historical data is not deleted or reprocessed, although reports can display historical sessions differently when bot sessions are filtered out.

The metrics that can move are the session-based ones. Shopify lists 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, plus other metrics that attribute orders or customers to sessions. Affected reports include the Analytics overview dashboard, Live View, the acquisition, behaviour and marketing reports, the search and product recommendation reports, and custom reports that use session data. If an app reads session data from Shopify Analytics, its numbers can change too.

Is it the update or a real drop?

Run three checks before you conclude anything. First, open the Analytics overview for the weeks either side of 21 September and compare orders, sales and customer counts. If they held while sessions fell, the update is the likely explanation, which is the test Shopify itself suggests.

Second, open a sessions report such as Sessions by landing page and, where the report supports it, add Human or bot session as a dimension to see what share of the weeks before the update is classed as bot. Shopify's bot filtering page says that when you filter out bots you might notice higher conversion rates and lower session counts, the pattern in the table above.

Third, if conversion rate looks low rather than high, run Shopify's cookie rotation check in a private window from a region where your consent banner shows. A session cookie that changes during one visit means your session count is inflated by your own storefront, which no update will fix.

How to compare Black Friday 2026 with 2025 fairly

Black Friday fell on 28 November 2025 and falls on 27 November 2026, with Cyber Monday on 1 December 2025 and 30 November 2026. Compare matching days of the week, Thursday to Monday, rather than calendar dates.

Lead with the numbers the update did not touch

Orders, net sales, average order value, and new and returning customers are measured the same way in both years. They answer the question most owners actually have, whether the weekend made more money, and they should open any report you share. Our piece on average order value versus conversion rate explains why order value often tells you more anyway.

Use the same bot filter, and know its limit

Black Friday 2025 falls after 7 October 2025, so Shopify's bot classification covers both years and you can set the Human or bot filter the same way on each side. Shopify warns that using the same filter setting does not make sessions measured before the update directly comparable with sessions measured after it, since the other two changes apply only to sessions measured after it.

Compare the lift, not the rate

A fairer read of conversion rate is how much Black Friday lifted it over a normal period in the same year, measured the same way. Take another invented example. In 2025 the store converted at 1.6 percent in October and 2.4 percent over the Black Friday weekend, a lift of 1.5 times. In 2026 it converts at 2.0 percent in October and 2.9 percent over the weekend, a lift of 1.45 times. The raw rate rose, but the sale lifted conversion slightly less than last year. The method is not perfect, since the midnight split bites hardest on busy evenings, but it keeps old and new measurement out of the same ratio.

If you query sessions across 21 September 2026 in the report editor, Shopify says it may display a notice that the date is crossed. Treat any such chart as two series, not one. Our guide to Shopify reports covers which reports each plan includes, and the Shopify conversion rate guide covers what a good rate looks like on the new baseline.

Where Arktis fits

Arktis counts with its own tracker, so Shopify's update did not change its numbers. The tracker keeps its own sessions, and the server drops requests from user agents on its list of known bots. The Overview shows visitors, sessions, pageviews and conversion rate, and Shopify orders arrive by webhook and are matched back to a visit, so the Revenue page shows revenue net of refunds, orders and paying customers by source. Unmatched orders are kept and appear under Direct.

Its sessions will not match Shopify's, and they should not be expected to: the two tools use different trackers and different rules. Compare each tool with itself over time, and use Arktis as a steady second line when Shopify's line moves for reasons of its own.

Where Arktis does not fit

Arktis cannot rebuild last year. It counts only from the day its tracker is installed, and Shopify orders arrive from the day the store connects, with no bulk import of earlier orders, so your year-on-year comparison has to come from Shopify's own reports. Its dashboards offer preset date ranges rather than custom dates, so for a day-matched comparison of two specific weekends Shopify's reports are the better tool. Arktis also identifies visitors per browser and does not join one person across devices, and it has no bot dimension you can toggle the way Shopify's reports do.

Get a steady second count before Black Friday

Install Arktis before Black Friday and you will have Arktis's own counts for this year's sale, measured the same way throughout the season, alongside Shopify's. Start the 7-day Growth trial, or compare plans on the pricing page. The Black Friday tracking checklist covers the rest of the setup, and Shopify Black Friday 2026 covers the store settings.

Sources

Shopify Help Center: changes to sessions and conversion rate in Shopify Analytics, rollout dates, the three changes, 30-minute inactivity, unaffected orders, sales and customers, bot classification from 7 October 2025, comparison advice and affected metrics and reports, accessed 2 November 2026

Shopify Changelog: Shopify Analytics session measurement improvements, announcement and new-baseline advice, dated 21 September 2026

Shopify Help Center: bot filtering in Shopify analytics and reports, Human or bot session filter, conservative classification, effects of filtering, accessed 2 November 2026

Shopify Help Center: analytics data points (fields) reference, conversion rate formula and sessions counted only with cookie consent, accessed 2 November 2026

Shopify Help Center: identifying and resolving session cookie rotation, the _shopify_s cookie, 30-minute rolling expiry and how rotation inflates sessions, accessed 2 November 2026