Key answer: the main Blitz lasted about eight months
The most intense bombing campaign against London by the German Luftwaffe, commonly known as the Blitz, ran from 7 September 1940 to around 10 May 1941. The heaviest and most sustained phase spanned roughly eight months, during which London faced continuous or near‑daily raids. Earlier sporadic bombing began in late August 1940, and smaller raids, including flying‑bomb and rocket attacks, extended the threat into 1944. In short, the period of direct, large‑scale bombing concentrated on London lasted approximately nine months in total, with the peak intensity compressing into those eight months.
Defining the Blitz
"The Blitz" refers to the sustained strategic bombing of London and other cities by Nazi Germany during World War II. It was intended to break civilian morale, disrupt industry, and force Britain to negotiate. While London bore the brunt, other industrial centres also suffered heavy raids. The campaign evolved from daylight attacks in 1940 to predominantly night raids as the Luftwaffe shifted tactics, aided by poor weather and the limits of German fighter ranges. Understanding this context helps clarify why the episode spanned many months rather than a single short burst.
What "how long" actually measures
When people ask how long the bombing lasted, they are usually asking about the period of significant, direct attacks on London rather than isolated raids or the broader war. The core answer distinguishes between: the start of concentrated raids on the capital, the peak nightly onslaught, and lingering attacks with new weapons. Historians typically mark 7 September 1940 as the beginning of the main Blitz, with a high point through spring 1941, before the heaviest pressure eased as Germany redirected airpower eastward.
Important phases and dates
To capture the full duration, it is useful to separate the Blitz into clear phases. The early phase saw daylight raids that targeted the docks and civic centres of London. As daylight losses mounted, the Luftwaffe shifted to night attacks, allowing more flexible routes but making precise bombing harder. Later waves included novel weapons such as the V‑1 flying bomb and V‑2 rocket, which extended the period of insecurity. The following table summarises the major phases, approximate dates, and their significance for understanding the overall timeline.
| Phase | Dates | What changed |
|---|
| Concentration on London begins | 7 September 1940 | Large raids over the capital each night; marks start of the main Blitz |
| Peak nightly raids | September 1940 – May 1941 | Repeated heavy bombing, widespread damage, high casualties |
| Shift to night bombing | After September 1940 | Daylight operations reduced; emphasis on darkness raids |
| Doodlebug and rocket attacks | June 1944 – early 1945 | New weapons extended the threat, but these were not the classic Blitz |
| Main campaign ends | By 10 May 1941 | Sustained Luftwaffe night raids on London largely cease as aircraft move east |
Why the duration varied
The length of the bombing was influenced by German strategy, weather, aircraft range, and the resilience of British air defences. As autumn and winter set in, nights were longer and cloud cover complicated navigation, reducing accuracy. The Luftwaffe also suffered losses, and by 1941 many units were needed for Operation Barbarossa, the invasion of the Soviet Union. Later, V‑1 and V‑2 attacks created a new kind of threat, though they were less about mass bombing formations and more about weapon‑based strikes. Together, these factors explain why the heaviest period was concentrated into roughly eight months, while the broader era of aerial threats extended over several more years.
Civil defence and daily life
Londoners adapted to years of uncertainty, spending nights in shelters, underground stations, and Anderson shelters. Air‑raid warnings, sirens, and blackout rules shaped routines. Firefighting, rescue, and welfare services operated under extreme pressure. The continuity of attacks over many months meant that the social, psychological, and economic impacts were profound and long lasting, even after the heaviest raids stopped. This context helps explain why the question of duration matters: it affected how people planned, coped, and rebuilt.
Distinguishing raids from the broader war
While the Blitz is often dated to 1940–1941, sporadic bombing and reconnaissance flights continued throughout the war. Isolated raids on London occurred after the main Blitz, and by 1944 new weapons meant a different tactical threat. However, historians reserve the term Blitz for the intensive, sustained bombing campaign primarily of 1940–1941. This distinction prevents confusion with later, less concentrated attacks and keeps the historical record clear.
Long-term legacy and memory
The Blitz left a lasting imprint on London’s built environment, population, and culture. Rebuilding took years, and many scars remained visible for decades. Commemorations, memorials, and museums continue to reflect on civilian courage and loss. Understanding how long the bombing of London lasted—and when the intense phase ended—helps situate those memories in the correct timeframe and recognise the full scope of the experience.