The short answer: Wednesday morning. Both Coles and Woolworths start their new weekly specials on Wednesday, generally from around 8am local time, and both run that catalogue through until close of trade the following Tuesday.
That's the whole answer to the question most people are asking. But the reason it's worth knowing isn't trivia — it's that a Tuesday shop and a Wednesday shop are not the same shop, and most households do the bulk of theirs on a weekend, squarely in the middle of a cycle they didn't choose.
What the week actually looks like
Think of the trading week as running Wednesday to Tuesday rather than Monday to Sunday. Everything about promotional pricing is organised around that boundary.
Why the boundary matters more than it sounds
If you shop on a Tuesday evening, everything you put in the trolley is priced under a catalogue that expires in a few hours. Anything that was going to be discounted this week already has been, for six days, and you're seeing the tail of it. The following morning, the entire promotional range changes.
That cuts both ways, and this is the part people get wrong. Tuesday isn't a bad day to shop — it's a great day to shop for the things on this week's special, because they're about to go back to full price. It's a poor day to do a general stock-up of things that aren't discounted, because tomorrow's list is unknown to you and might contain half of them.
A practical note on timing. The changeover is a morning process, not a stroke of midnight. Early Wednesday shoppers sometimes find tickets mid-swap, with parts of the store on the new catalogue and parts still on the old. If a price looks wrong on a Wednesday morning, it's worth checking at the register rather than assuming.
The catalogue is not the whole picture
It's easy to assume the weekly catalogue is the specials. It isn't. Alongside it, both retailers run longer-running price programs that don't follow the Wednesday rhythm at all, plus member-only pricing, plus in-store clearance markdowns that are decided store by store, often daily, based on stock that needs to move.
So "when do specials change?" has a precise answer for the catalogue and a much messier one for everything else. A product you care about can drop in price on a Thursday for reasons that have nothing to do with the weekly cycle, and no catalogue will tell you.
Knowing the cycle tells you when to look. It can't tell you what to look at — because the one thing the catalogue never contains is a list of the products you personally buy.
This is the gap that catches most people. You can memorise the Wednesday changeover, check the catalogue every week, and still miss the thing you actually wanted, because it was one line item among thousands and you didn't scroll past it. The cycle is knowable. Your attention isn't infinite.
Which is a long way of saying: the useful version of this knowledge isn't "check every Wednesday". It's "make something else check every Wednesday, and only speak up when it's one of mine".
Let the cycle come to you
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