London's festive switch-on season kicks off earlier than you might think, and 2026's line-up is spread across more than a dozen neighbourhoods. The first lights flicker on in early November, and by the last week of the month the whole city is glowing. Most displays stay up until the first week of January, so there's a wide window for a festive city break.

The biggest names lead the way. Regent Street goes dark to traffic on Thursday 5 November for its switch-on, with the returning Spirit of Christmas display stringing more than 300,000 LEDs above the flagship stores. Carnaby Street is even earlier, lighting up on Wednesday 4 November with a nostalgic British-90s theme — sign up to the This is Soho newsletter and you could bag a free cocktail on the night (first 1,000 redemptions).

Oxford Street's date is still to be confirmed, but the 2026 theme is already big news: a partnership with HBO Max tied to the new Harry Potter series, plus the UK's largest official Harry Potter Shop, a two-storey Diagon Alley-inspired space at 134-140 Oxford Street. Expect plenty of Potterheads on Europe's busiest shopping street.

For atmosphere, Covent Garden is hard to beat. Its Theatre of Christmas programme runs seven weeks from the 12 November switch-on, when a 50-foot tree dressed with giant bells and over 300,000 lights comes alive to performances from West End casts. A new Forest of Theatre installation launches too, and from 4 December there's guaranteed hourly snowfall on the piazza from midday to 9pm.

Elsewhere, Marylebone Village switches on 11 November with a 55-foot Ferris wheel and live performances on Devonshire Street hosted by BBC broadcaster Jo Good. King's Cross and Coal Drops Yard follow on 26 November with a festive roller rink and winter market, while Old Spitalfields Market and Leadenhall Market also illuminate on 11 and 19 November respectively — the latter with pyrotechnic firework fountains and a 26-foot tree unveiled by the Lord Mayor.

A few displays double as full evenings out. Christmas at Kew opens on 13 November, with light tunnels, sparkling water features and the Palm House finale; new for 2026 are adults-only nights on 3 and 9 December. Fleet Street Quarter launches a Dennis the Menace Mega Mischief Trail of a dozen artist-designed installations marking 75 years of the Beano character, running until 15 January. St Katharine Docks combines a Christmas market (7 November to 3 January) with a switch-on featuring the Yeomen Warders of the Tower of London.

Two late, tradition-heavy options round things off: Trafalgar Square lights its famous Norwegian spruce — an annual gift from Norway since 1947 — on 3 December, and Savile Row's tailor-themed display, featuring giant golden shears and over 5,000 low-energy bulbs, glows from mid-November.

If you're planning a trip, note that switch-on dates are staggered, so it's perfectly doable to catch two or three in one long weekend. Early November suits shoppers wanting the streets quietish before peak season; late November onwards delivers markets, mulled wine and the fullest festive feel.