Every four years or so, something extraordinary happens deep inside Bitcoin's code: the reward for mining new blocks gets cut in half. It's called the halving, and it is arguably the most anticipated event on the entire crypto calendar. Below is the complete list of Bitcoin halving dates, what happened on each one, and what the next cycle could look like.

What Exactly Is the Bitcoin Halving?

The Bitcoin halving is a pre-programmed event written into the protocol by Satoshi Nakamoto back in 2009. Roughly every 210,000 blocks, the reward that miners receive for finding a new block is automatically slashed by 50%. Because blocks are targeted to arrive every 10 minutes, that math works out to approximately one halving every four years.

The purpose is simple but powerful: it enforces Bitcoin's hard cap of 21 million coins. Unlike fiat currencies that can be printed infinitely, no one — not developers, not miners, not governments — can ever change that supply schedule. So far, four halvings have taken place, and roughly 93% of all Bitcoin that will ever exist has already been mined.

Why it matters

  • It cuts new supply in half, creating a built-in scarcity shock.
  • It forces miners to stay efficient as their revenue shrinks.
  • It anchors long-term market cycles that traders obsess over.

Every Bitcoin Halving Date in History

Here is the full timeline of Bitcoin halving dates, from the very first one to the most recent.

  • November 28, 2012 — Block 210,000. Reward cut from 50 BTC to 25 BTC. Bitcoin was roughly $12 at the time.
  • July 9, 2016 — Block 420,000. Reward cut from 25 BTC to 12.5 BTC. BTC hovered near $650.
  • May 11, 2020 — Block 630,000. Reward cut from 12.5 BTC to 6.25 BTC. Price was around $8,600, just weeks after the COVID crash.
  • April 19, 2024 — Block 840,000. Reward cut from 6.25 BTC to 3.125 BTC. BTC traded near $63,000.

In just over a decade, the per-block reward has dropped from 50 BTC to 3.125 BTC — a 94% reduction. That downward grind is the heartbeat of Bitcoin's monetary policy.

How the Halving Cycle Actually Works

The mechanism is deceptively simple. The Bitcoin network tracks block height, and once it crosses a multiple of 210,000, the code automatically halves the subsidy. Miners still earn transaction fees, but the freshly minted portion of their reward shrinks.

Because hash rate varies, blocks aren't always exactly 10 minutes apart. When more miners join, difficulty rises and the pace slows down a touch; when miners leave, the opposite happens. Historically, the gap between halvings has stretched slightly longer than four years — the 2024 event, for example, arrived about three days later than the 1,460-day ideal.

The supply shock narrative

Each halving instantly cuts the rate of new BTC entering circulation. With demand steady or rising, basic economics suggests prices should climb — and historically, they have. Every previous halving was followed by a major bull run within 12–18 months, though past performance is never a guarantee of future results.

What the Next Bitcoin Halving Could Mean

The fifth Bitcoin halving is expected sometime in 2028, likely landing in the spring. The reward will drop from 3.125 BTC to 1.5625 BTC per block. By that point, the annual rate of new Bitcoin issuance will be under 0.5%, lower than most central bank inflation targets.

For miners, the math gets tougher. With shrinking subsidies, only the most efficient operations — those with cheap electricity, modern ASICs, and strong fee revenue — will thrive. Transaction fees, once a tiny slice of miner income, will increasingly dictate profitability.

Price implications

Macro factors like interest rates, regulation, and ETF flows now play a much larger role than they did in 2012 or 2016. Still, the supply-side shock is structural and automatic. Whether the post-2028 bull market matches the magnitude of previous cycles is anyone's guess, but the underlying scarcity argument is stronger than ever.

Key Takeaways

  • Bitcoin has had four halvings: 2012, 2016, 2020, and 2024.
  • Each one cut the block reward by 50%, from 50 BTC down to 3.125 BTC.
  • The next halving is expected around 2028, dropping the reward to 1.5625 BTC.
  • Halvings are programmed, predictable, and unstoppable, which is precisely what makes them powerful.
  • Watch miner economics, hash rate, and ETF flows to gauge how the cycle plays out.

The halving is the one scheduled event in crypto that almost never gets delayed. Whether you're a long-term holder, a trader, or just halving-curious, mark these dates on your calendar — they tend to move markets.