Many shops organise the year around Christmas and Black Friday, but demand has other peaks and troughs by category: back to school, summer, Easter, Mother’s Day, change of season, holidays, sport, garden. Knowing your category’s calendar lets you distribute budget and effort better.
The essentials in a definition
Seasonality in e-commerce goes beyond Christmas: each category has its own peaks (back to school, summer, Mother’s Day, Black Friday, season changes, sales). A demand calendar by category lets you anticipate budget, stock and creatives. Your own GA4 data, Think with Google trends and Eurostat e-commerce statistics help build it.
Each category has its own calendar
Fashion and footwear follow the seasons and end-of-season offers. Home and garden gain strength in spring. School supplies peak in August and September. Fitness equipment rises in January. Travel, close to holidays. Gifts, around personal dates. Electronics peak at launches and in sale seasons.
Knowing your curve avoids surprises.
How to build the calendar
Gather weekly sales for two to three years by category, search data and relevant events (holidays, launches, competitor campaigns). Mark peaks, troughs and causes. Add commercial dates that affect your category. Project to the following year, with ranges.
Update with the experience of each season.
A demand calendar by category
- Gather weekly data across several years
- Mark peaks, troughs and commercial dates
- Bring campaigns and stock ahead of the peak
- Use troughs to test and capture contacts
Applying to campaigns
Start campaigns before the peak, with creatives and stock ready. Reinforce budget where demand is strong and return pays off. In troughs, keep a minimum presence, test new messages, capture contacts and prepare the next season. Adjust assortment and message to the moment.
Also plan the end of each season, to clear stock without destroying margin.
Whoever knows their category’s year does not depend on Christmas alone.
Balancing the year
Avoid depending on a single season: look for products and offers that sustain the weak months (consumables, services, subscriptions). Consider promotions in troughs to smooth demand, mindful of margin. Use the calendar in negotiations with suppliers and logistics.
Review budget distribution quarterly.
Decision table
| Element | How to do it | Caution |
|---|---|---|
| History | Analyse at least two years of your own | Do not extrapolate an atypical year |
| Lead time | Prepare stock and creatives in time | Starting late |
| Budget | Distribute by demand and margin | Spending equally all year |
| Adjustment | Review with real-time data | Following the plan blindly |
Common mistakes to avoid
- Concentrating everything on Christmas. Peaks of other seasons are lost.
- Ignoring stock. Advertising what will sell out wastes budget.
- Copying others’ calendar. Your category has its own patterns.
How to measure the result
Track sales, cost per acquisition and margin per week, compared with the same periods in previous years.
Limits and exceptions
Patterns change with weather, economy and competition, and an atypical year distorts the calendar. In new or niche categories, data is scarce. Review the calendar every year and keep flexibility to react.
Illustrative example
Illustrative example: a garden-supplies store analyses two years of data and identifies a peak in March and April, earlier than it assumed. It brings forward stock, prepares creatives in February and reinforces budget in those weeks, reducing it in lower-demand periods. It compares the result with the previous year.
In practice: checkpoints
Mark each category’s peaks on a calendar with the work required before them: stock, content, offers and budget. Compare weekly sales, searches and margins with the previous year, and adjust the plan when demand moves earlier or later than expected. Keep a note of weather, holidays and events that changed the pattern, so next year’s forecast is more accurate. Share the calendar with purchasing, support and logistics, since the whole business has to be ready, not only the ad account.
Frequently asked questions
Where do I see my category’s seasonality?
In historical sales, analytics and trend tools.
How do I use the troughs?
For tests, capturing contacts and preparing the next season.
Should I promote off-season?
Carefully with margin. Test specific offers.
How do I build a demand calendar?
With your own weekly sales and search data, cross-checked with public trends.
What if it is a new business?
Use demand trends and sector data, and adjust as you collect your own data.
Build a demand calendar by category with own and public data, and plan stock, budget and creatives in advance.
Sources and recommended reading
Last editorial review: October 2026. Informational content; always confirm current conditions in the official sources before deciding.