The Mongols did not invade China in a single year; it happened in stages over many decades.

Short answer

  • The Mongols began raiding Chinese frontier states (Western Xia) around 1205–1207.
  • A full-scale invasion of Jin (northern China) started in 1211.
  • They captured Beijing (Yanjing/Zhongdu) in 1215.
  • They completed the conquest of all of China with the fall of the Southern Song in 1279.

So if you’re asking “when did the Mongols invade China,” most historians point to 1211 as the start of the main invasion of northern China, but the broader Mongol conquest of China runs from about 1205 to 1279.

Quick Scoop: How it unfolded

1. First moves on China’s edge (1205–1209)

Before touching the heartland, Genghis Khan tested China’s borders.

  • In 1205 , the Mongols launched small raids into Western Xia (Xi Xia) , a Tangut kingdom on China’s northwestern frontier.
  • In 1207–1209 , these raids escalated into a larger campaign that forced Western Xia’s ruler to submit and recognize Mongol overlordship.

You can think of this phase as the “opening probes” rather than a full invasion of China proper.

2. Main invasion of northern China (Jin dynasty, from 1211)

The real “invasion of China” usually refers to the attack on the Jin dynasty , which ruled much of northern China , including Beijing.

  • In 1211 , Mongol armies crossed the frontier and invaded Jin territory in three main columns from the north.
  • Over the next years they ravaged the countryside, besieged cities, and broke Jin resistance step by step.
  • In 1215 , they captured and sacked the Jin capital Yanjing/Zhongdu (modern Beijing) , a major turning point that gave them control over much of the north.

If you want a single “headline date,” 1211 is the standard answer for when the Mongols invaded northern China.

3. Step-by-step conquest to full control (13th century)

After Jin, the Mongols kept pressing deeper into Chinese realms.

  • They destroyed Western Xia completely by 1227 , erasing it as a state.
  • They fought a long war against the Southern Song in central and southern China that dragged on for decades.
  • Under Kublai Khan , they finally crushed the last Song resistance by 1279 , giving the Mongols control of all of China for the first time under the Yuan dynasty.

So while the invasion began early in the century, the conquest wasn’t finished until nearly 70 years later.

4. Why this is a “trending topic” angle

People still discuss “when did the Mongols invade China” in forums and Q&A threads because:

  • Some focus on the first raids (1205–1207, Western Xia).
  • Others emphasize the big campaign against Jin (starting 1211).
  • Others think of the Mongol conquest as a whole , ending with the fall of the Song in 1279.

So different answers (1205, 1207, 1211, 1215, or 1279) reflect which phase of the Mongol push into China they mean.

TL;DR

  • First Mongol attacks near China: 1205–1207 (Western Xia raids).
  • Major invasion of northern China (Jin) : 1211 onward.
  • Capture of Beijing (Jin capital): 1215.
  • Final conquest of all China (fall of Southern Song): 1279.

Information gathered from public forums or data available on the internet and portrayed here.