In short
Update them when the page stops describing what it sells, which is driven by events rather than by a calendar. The reliable triggers are a material change in the range, a season turning, a shift in the queries the page is picking up, and a decline in click-through rate on terms where the position has held. As a working rhythm, review your highest-revenue categories every quarter, the middle tier twice a year and the long tail annually, and change only what has actually gone out of date.
Editing for the sake of freshness does nothing
Changing a date, shuffling a paragraph or swapping a few words does not make a category page more relevant, and search engines are well equipped to tell a substantive revision from a cosmetic one. Pages that rank for evergreen commercial terms are not competing on recency, they are competing on how well they answer the query.
Where recency genuinely matters is where the underlying subject changes. A category selling seasonal goods, regulated products, technology with annual model cycles or anything tied to compatibility does change, and a page that still describes last year's range is factually wrong rather than merely stale.
That gives a clean test. Read the page as though you were a shopper arriving today. If anything on it is no longer true, or if it fails to mention something that now matters in the category, it needs work. If it reads accurately, leave it alone and spend the time on a page that does not.
The cost of unnecessary editing is not neutral either. Every revision risks losing a phrasing that was matching queries, and constant churn makes it impossible to attribute changes in performance to anything.
The triggers worth watching
Assortment change is the first. When a meaningful share of the products on a category have turned over, the introduction, the guidance and the featured items usually no longer match what is on the shelf. Stores that track this can set a threshold and let the page flag itself.
Season is the second, and it is the one most often handled badly. A category with strong seasonality should have its ordering, featured products and guidance rotated ahead of the season rather than during it, so the page is already right when demand arrives. Plan those edits into the merchandising calendar.
Query drift is the third. Open Search Console, compare the queries a category page received impressions for this quarter against the same quarter last year, and look for phrasing that has appeared or disappeared. New modifiers indicate demand your copy does not yet address, and sometimes indicate a subcategory worth creating.
The fourth is a fall in click-through rate at a stable position, which usually points at the title and description rather than the page. That is a small, cheap edit with a fast read on whether it worked.
The fifth is external: a change in what ranking pages look like for your main terms. When the results shift toward guides, comparison tables or a different intent, the page has to change with them.
What to change when an update is warranted
Work through the page in the order a shopper meets it. The title tag and meta description first, since they decide whether anyone arrives. Then the introduction above the grid, which should state what the range covers now and who it suits, in the current vocabulary.
Then the merchandising itself. Default sort order, which products are featured, whether the filters match how people are choosing this season, and whether the subcategory links reflect the current shape of the range. This part is usually worth more commercially than the copy edits.
Then the guidance below the grid: the buying advice, the sizing or compatibility notes, and the questions. Add the questions people are actually asking now, taken from support messages and site search, and remove the ones that no longer come up.
Finally the links. Internal links from the category to its subcategories, to relevant guides and to the parent, plus links pointing back at the category from those places. Structure decays quietly as pages are added and removed, and a periodic check keeps the paths intact.
A rhythm that scales, and how to tell if it worked
Tier the catalogue. The categories carrying most of the revenue get a proper quarterly review. The middle tier gets one twice a year. The long tail gets an annual pass, mostly checking that the page is still accurate and that the products on it exist. Anything with a seasonal peak gets an additional edit timed six to eight weeks before that peak begins.
Record what you changed and when, in whatever the team already uses. Without that record you cannot connect a movement in position or revenue to an edit, and after two quarters nobody remembers.
Measure the effect on three things: impressions and the number of distinct queries the page appears for, click-through rate at comparable positions, and revenue per session on the page. The first two respond within weeks, the third takes longer and is noisier because it depends on stock and price as well.
If a category has been reviewed twice with no movement on any of the three, the constraint is probably not the page. At that point the useful questions are about assortment, price competitiveness and whether the category is genuinely one you can win.
Related questions
Does changing the published date on a category page help rankings?
No. A date is a piece of information for the reader, and altering it without changing the page does not make the page more useful. If the content genuinely has been reviewed and revised, showing a last reviewed date is honest and helps shoppers judge the guidance, which is a better reason to display one.
Does reordering the products on a category count as updating it?
For shoppers, very much so, since sort order determines what most people see and it moves revenue. For search, it is a smaller change than revising the text and structure. Treat merchandising and content as two separate cadences: sort order can change weekly, while copy and guidance change when the range or the season does.
How long after updating a category page should improvement appear?
Expect Google to recrawl within days to a few weeks depending on how often the page is visited, and expect any position change to settle over several weeks after that. Title and description edits show up in click-through rate fastest. Structural and content changes take longer because the page has to be reassessed against competing results.