The UK Ecommerce Calendar: Every Sales Date and Marketing Deadline

Key Takeaways

• Black Friday is 27 November 2026 and 26 November 2027; Cyber Monday is 30 November 2026 and 29 November 2027. Singles Day is always 11 November.
• Small Business Saturday UK is the first Saturday in December (5 December 2026), not the American date a week earlier.
• Royal Mail's last Christmas posting dates for 2026 run from 18 December (2nd Class) to 23 December (Special Delivery); international dates fall in the first half of December.
• November and December 2025 took 22.7% of the UK's annual online spend, by Adobe's figures, so these two months need campaigns live by mid October to clear Google's and Meta's learning periods.
• Mother's Day is 7 March 2027, Easter Sunday 28 March and Father's Day 20 June; every 2027 bank holiday is in the tables, from gov.uk.
• For one of our clients the New Year period earned more than Christmas in 2025, which is why the calendar does not stop on 25 December.

Quick Answer

This is a working calendar for UK online retailers, from November 2026 to the end of 2027, with every sales date, awareness day and bank holiday that moves demand, the Royal Mail posting dates that set your delivery promise, and the date you need to start each campaign to be ready. Each date is sourced from the organiser, gov.uk or Royal Mail where one exists, and marked as calculated where it follows a fixed rule. Bookmark it, and check the organiser's page before you commit a budget, because some 2027 dates are not yet announced.

Table of Contents

• How to Use This Calendar
• November and December
• January to March
• April to June
• July to September
• October to December
• The Deadlines Behind the Dates
• Why Matters Perspective
• Frequently Asked Questions
• Final Thoughts
• Related Articles

How to Use This Calendar

Every date below has a source. Dates marked "official" were read on the organiser's own page, gov.uk or royalmail.com on 15 October 2026. Dates marked "rule" follow a fixed rule, such as the first Saturday in December, and have been checked against the calendar. Dates marked "expected" have not been announced yet and are our best estimate from the previous year. The "Start by" column is the date to have campaigns running, based on the platform guidance in the deadlines section.

Not every date suits every brand. Pick the five or six that fit your products, put the start dates in your planning tool, and ignore the rest. Our ecommerce marketing strategy guide explains how to build a year around them.

November and December

These two months are the ones that matter most. Adobe measured £26.9 billion of UK online spend across November and December 2025 (Adobe Digital Insights, reported by IT Brief), against £118.5 billion for the full year, which is 22.7% of annual online spend in 17% of the year. ONS put the online share of all retail sales at 28.6% in November 2025 and 28.3% in December 2025, and called November's 11.9% month on month rise in non seasonally adjusted volumes "a fairly typical Black Friday effect". Shopify reported $14.6 billion of global sales over Black Friday and Cyber Monday 2025, up 27%, with the UK its second largest selling country (Shopify BFCM 2025 data).

Royal Mail says its dates are correct at the time of publishing and subject to change, and its 2026 page sends international senders to its country guides. In 2025 the standard international dates were 7 December for most of Western Europe, 8 December for the USA, Canada, Italy, Poland and Sweden, and 11 December for Australia, Asia, Africa and the Middle East, so plan on the first half of December and check the guide for each country you ship to. Our Christmas marketing guide covers what to send around these dates.

January to March

April to June

July to September

October to December

The Deadlines Behind the Dates

The "start by" dates above come from what the platforms themselves say about lead times.

• Google Ads. Google's Performance Max guidance says to run a campaign for at least six weeks before judging it and to upload seasonal assets at least two weeks ahead so they are approved in time. Six weeks before 27 November is 16 October. Google also says to use seasonality adjustments only for short events of a few days where conversion rate moves by about 30% or more, and to adjust ROAS or CPA targets manually for longer promotions.
• Meta. Meta's 2026 holiday guides split the quarter into discovery (October to early November), deals (Black Friday and Cyber Monday), gifting (December) and fresh start (late December into January), and say to start early enough for campaigns to clear the learning phase. The learning phase needs about 50 optimisation events in seven days, and large edits restart it, so avoid changing budgets by 20% or more in Black Friday week. Our guide to Facebook ads costs in the UK explains what to expect in Q4.
• Email. Klaviyo suggests teasers two to four weeks out, early access and gift guides in early to mid November, your most engaged segments on the Thursday, Friday and Sunday before Black Friday, VIP early access on the Tuesday to Thursday before, and up to three emails and two texts on the peak days, sent in the recipient's local time. Klaviyo also notes that 24% of consumers start their Black Friday shopping early and 32% make most holiday purchases in November.
• Delivery. Royal Mail publishes its dates in September or October. Put them on the product page, the basket and the checkout from 1 December, and send an "order by" email the day before each cut off. Our WhatsApp marketing guide shows how a dispatch message before the cut off reduces cancellations.

Why Matters Perspective

We plan the year for Shopify brands and the same two mistakes come up every time. The first is treating Black Friday as a single day: it is a season that opens with Singles Day on 11 November and closes with the January sales, and the brands that do well have their ads out of the learning phase by the middle of October. The second is stopping at Christmas. For one of our clients, the New Year period brought in more revenue than the Christmas period in 2025, which is why the Boxing Day sale is built and tested before the last posting date rather than after it.

The dates that catch people out are the small ones: the UK Small Business Saturday a week after the American one, the international posting dates in the first half of December, and the bank holidays that move delivery by a day. We put all of them in a client's plan in September. If you would like us to build yours, our pricing is published, retainers start from £650 a month plus VAT and can be ended at any time, and our marketing agency page explains what a plan includes.

Frequently Asked Questions

When is Black Friday in the UK?

Black Friday is the day after the fourth Thursday of November, which is the American Thanksgiving holiday. That makes it Friday 27 November 2026 and Friday 26 November 2027, with Cyber Monday on 30 November 2026 and 29 November 2027. UK retailers follow the American date.

When is Small Business Saturday in the UK?

Small Business Saturday UK is the first Saturday in December: 5 December 2026 and 4 December 2027. It is a different date from the American event, which falls on the Saturday after Thanksgiving, and some email calendars written for the US list the wrong one.

What are the Royal Mail last posting dates for Christmas 2026?

Royal Mail lists Friday 18 December 2026 for 2nd Class and 2nd Class Signed For, Saturday 19 December for Tracked 48, Monday 21 December for 1st Class, 1st Class Signed For and Tracked 24, and Wednesday 23 December for Special Delivery Guaranteed. International dates are in Royal Mail's country guides and in 2025 fell between 7 and 11 December for most destinations.

When should I start Black Friday advertising?

Google says to give a Performance Max campaign at least six weeks before judging it, and Meta says to start early enough that campaigns clear the learning phase, which needs about 50 conversions in seven days. For a 27 November Black Friday that means new campaigns live by mid October, with assets uploaded at least two weeks before any sale so they are approved in time.

When should I send Black Friday emails?

Klaviyo's guidance is to start teasers two to four weeks before Black Friday, send early access and gift guides in early to mid November, email your most engaged segments on the Thursday, Friday and Sunday before, give VIPs early access on the Tuesday to Thursday before, and send up to three emails and two texts on Black Friday and Cyber Monday themselves.

How much of the year's online sales happen in November and December?

Adobe measured £26.9 billion of UK online spend across November and December 2025 against £118.5 billion for the full year, which is 22.7% of annual online spend in two months. ONS put the online share of all retail sales at 28.6% in November 2025 and 28.3% in December 2025.

When is Mother's Day and Father's Day in the UK in 2027?

Mothering Sunday is three weeks before Easter Sunday, so it falls on Sunday 7 March 2027. Father's Day is the third Sunday in June, Sunday 20 June 2027. Easter Sunday 2027 is 28 March, with Good Friday on 26 March and Easter Monday on 29 March.

Which UK dates do ecommerce brands most often miss?

Singles Day on 11 November, which now opens the peak season; the Royal Mail international posting dates, which fall in the first half of December; Small Business Saturday on the first Saturday in December; and the Boxing Day to New Year window, which for one of our clients earned more than Christmas in 2025.

Final Thoughts

A calendar is only useful if the start dates go in before the sale dates. Take the six events that fit your products, count back six weeks for ads and four weeks for email, and put those dates in your planner now.

We will update this page when Royal Mail, Small Business Saturday UK and Amazon publish their 2027 dates. If you spot a date we have missed, email us and we will add it with a source.

Related Articles

• Singles Day: How UK Brands Can Use 11 November
• Christmas Marketing Ideas for Ecommerce
• Boxing Day and January Sales Plan
• Ecommerce Marketing Strategy
• How Much Do Facebook Ads Cost in the UK?
• Klaviyo Flows Every Shopify Brand Should Build
• Your First 90 Days: A Marketing Plan for New Shopify Stores