Blog · 22 September 2026
Why are shelves empty in the evening and on Sundays?
In shortShelf teams start early, often before opening, and finish in the early afternoon. The shelves, meanwhile, empty all day. The result: the store is fullest in the morning and emptiest in the late afternoon, exactly when it is busiest. On Sundays and public holidays there is no delivery on top of that. If you are after a specific product, a weekday morning is the safest time, especially after a delivery day.
The gap between the store’s hours and yours
In most stores, shelf filling happens early: the delivery arrives at dawn, teams fill before opening or during the morning, and a good share of them finish their shift in the early afternoon.
The shelves do not stop emptying. And the footfall peak is often after 5 pm, when people leave work. So you arrive when the shelf has served the most people and the fewest are left to refill it.
Sundays and public holidays stack the handicaps
Three things combine:
- there is no delivery that day, neither from the warehouse nor from direct suppliers such as bread or newspapers;
- the team is reduced to a few people, who also cover the till and the closing;
- the shelf is coming out of Saturday, the biggest sales day of the week.
What is missing on Sunday morning will often be missing until Monday, sometimes Tuesday if the holiday falls on a Monday.
When you will find the most
| Time | Availability | Why |
|---|---|---|
| Weekday morning | the best | the shelf has just been filled |
| Early afternoon | good | stock from the morning remains |
| 5 pm to closing | the worst | the shelf has sold all day, fewer staff |
| Saturday afternoon | poor | the biggest sales day |
| Sundays and public holidays | poor | no delivery, reduced team |
On fresh products the gap is sharper still: they are deliberately put out in small quantities several times a day, so they do not spoil. A half-empty fresh aisle at 7 pm is not necessarily badly run: sometimes it is the sign that it sold well.
What you can do
- For something you really need, come in the morning, or on a delivery day if you know it. An aisle employee will gladly tell you.
- In the evening, ask about the back room. A large share of products absent from the shelf are inside the store, simply not put out. In the evening there is often nobody to do it spontaneously, but someone can go and fetch.
- Don’t be too quick to conclude the store is badly run. An empty shelf at 7 pm and an empty shelf at 10 am do not mean the same thing.
Why reporting helps
In the evening, the duty manager is responsible for the whole store and cannot walk every aisle. Your report tells them which product is missing at the moment it is missing, and they can send someone to fetch it from the back room instead of discovering the gap the next morning.
It is also the only way for the store to know that the evening out-of-stock exists: by the next morning the shelf is full and everything looks normal.
How to report in two seconds
With ShelfAlert, there is nothing to install. Open shelfalert.io/signaler in your phone’s browser, or scan the ShelfAlert code if the store displays one.
- Scan the barcode of an identical neighbouring product, or the shelf label.
- If nothing scans, take a photo: the product is identified automatically.
- Confirm. The store manager, if subscribed, receives your report in real time.
What if the store isn’t on ShelfAlert yet?
Tell its manager, or send them the page for store managers: the trial is free for 14 days, with no payment card.
Sources
- Corsten, Gruen, “On Shelf Availability”, 2004: summary.
- Gruen, Corsten, Bharadwaj, “Retail Out-of-Stocks: A Worldwide Examination”, GMA, 2002: full study (PDF).