When to Switch to Your Winter Duvet: The Exact Date (Plus a Full UK Tog Guide)

The equinox has just passed, the clocks haven't gone back yet, but if you've woken up reaching for an extra blanket this week, you're not imagining it — this is the exact window when most of the UK starts thinking about swapping duvets.

There isn't one magic calendar date that works for everyone, whatever the “put your winter duvet on this Tuesday” headlines suggest. The real answer depends on your room temperature, not the date on your phone. Here's how to actually get the timing — and the tog — right this year.

So, is there an “exact date”?

Not really, but there's a reliable pattern. UK homes typically need a tog change when overnight temperatures settle below around 15–16°C, which for most of the country lands somewhere between late September and mid-October. Southern England tends to hold on a little longer; Scotland and the north usually switch first. The clocks changing at the end of October is a decent secondary cue — by then, almost everyone's heating is back on.

The better signal than any date: how you're actually sleeping. If you're waking up cold, piling on jumpers before bed, or your windows are getting a bit of condensation in the morning, that's your body telling you before the calendar does.

Tog rating, explained simply

Tog measures how well a duvet holds heat — the higher the number, the warmer it sleeps. It has nothing to do with thread count or fabric quality, only insulation. As testers at Which? and Ideal Home have found after working through dozens of duvets between them, tog rating alone doesn't guarantee a comfortable night — the cover fabric plays just as big a part, which is worth keeping in mind before you assume you simply need “more tog.”

UK tog guide by season

10.5 tog is the UK's most popular year-round choice for exactly this reason — it covers the long stretch from now through to early winter without needing a full swap again in November.

A few things that change the numbers above

Central heating, room size, and how warm a sleeper you naturally are all shift these guidelines. A warm sleeper in a small, centrally heated room can often stay in a 9 tog well into November. A cold sleeper in a draughty period property might want to jump straight to 13.5 tog. If two people share a bed and run at different temperatures, a duvet with two different togs zipped together (a “his and hers” or all-seasons duvet) solves it without an argument.

What actually keeps you comfortable besides the duvet

This is the part most tog guides skip: the fabric touching your skin matters as much as the fill. Cotton sateen — the fabric we work with at Sukun — is breathable by nature, which is exactly why it works across seasons rather than just one: it won't trap heat and leave you clammy under a heavier winter duvet, and it won't feel cold or papery layered over a lighter one in autumn. That's the real difference versus synthetic or polycotton covers, which tend to trap moisture and disrupt sleep whatever the tog rating. It's also why layering makes sense right now: a 7.5–9 tog duvet in a cotton sateen cover, plus a woven blanket at the foot of the bed, gives you more control than jumping straight to a heavy winter tog — especially in a home where the heating comes on unpredictably.

If you're not ready to buy a new duvet outright, our bedding bundles are built with this transition in mind — a cotton sateen duvet cover and pillowcase set you can layer over whatever tog you already own, rather than a full replacement.

Quick answers

Can I use a 10.5 tog all year round? In a well-insulated, centrally heated home, yes — many people do. In an older or colder property, you'll likely still want to size up for December through February.

Is 13.5 tog too warm? Only if your room runs warm or you're a naturally hot sleeper. For a cold room or a cold sleeper, it's the standard winter choice, not an outlier.

Should I store my summer duvet or layer it? Either works. Storing it flat (not compressed for long periods) keeps the fill from clumping; some people prefer to keep it as a light layer under a heavier duvet on the coldest nights instead of buying a separate high-tog option.

The bottom line

Skip the fixed date. Watch your room, not the calendar — once nights are consistently landing under 15°C, it's time to make the move, and 10.5 tog is the sensible default for most UK bedrooms right now. Pair it with a breathable cover and you'll likely need one fewer duvet swap than you think.