How long do Bitcoin bear markets last?

Across Bitcoin’s three completed market cycles, the bottom arrived 364 to 406 days after the cycle peak — roughly 12 to 13 months. Most cycle analysis asks how far price has fallen. This asks a different question: how far along the decline is in time. Two cycles sitting at the same drawdown can be at very different points in their descent, and only one of those facts tells you what is likely still ahead.

The three completed cycles

Why measure from the peak, not the halving

Bitcoin cycle analysis is usually anchored to the halving, because it is a known date that can be marked on a calendar years in advance. But the decline does not begin at the halving — it begins at the top, and anchoring to the top is empirically far tighter:

• From the cycle peak: 406, 364, 378 days — a standard deviation of about 21 days.
• From the halving: 777, 889, 924 days — a standard deviation of about 77 days.

The halving anchor is nearly four times noisier. It also creates a subtler problem: a halving-to-halving window can reach into the next cycle’s rally. The window beginning at the May 2020 halving runs to April 2024, so it contains the run-up to the 2024 halving — a higher price than the November 2021 top that actually capped that cycle. Anchoring to a price event instead of a calendar date avoids this by construction.

Why cycle tops are curated, not detected

It is tempting to find peaks automatically — declare a top confirmed once price falls some fixed percentage from it. No threshold works. In April 2013 Bitcoin fell 70.3% in a single week, from $230 to $68, and then rallied more than seventeenfold to its real top that December. Any rule that confirmed a cycle top at a 70% drawdown would have called that one wrong. Crypto’s mid-cycle crashes are simply too violent, relative to its cycle-ending declines, for one number to separate them. So the completed peaks are curated from daily closes, and only the current, unfinished cycle is tracked automatically — as the highest close since the last confirmed bottom.

Rallies are normal inside a bear market

Every completed Bitcoin bear market contained several rallies of 20% or more before its actual low — three in 2013–2015, four in 2017–2018, two in 2021–2022. Some were large: +88% in early 2014, +66% in 2018, +500% across 2014. All of them were followed by lower prices. A bounce, by itself, is not evidence that a decline has ended. What is more informative is whether a rally exceeds the previous rally’s high; a sequence of lower highs suggests the downtrend is intact.

What the three cycles do and don’t support

Bear markets have grown shallower each cycle — 86.7%, then 83.3%, then 76.7% — and slower to develop: the days taken to first fall 36% from the peak have run 3, 31, 59 and 117, roughly doubling each time. These are real patterns in the data. They are also patterns drawn from three or four observations, which is nowhere near enough to establish a rule. Anything built on them, including the 364–406 day range itself, should be read as a description of what has happened, not a forecast of what will. The band on the chart is the literal minimum and maximum of three cycles — deliberately not an average, and not a confidence interval, because three points cannot support either.

See it live

Track the current decline against every past cycle on the Bitcoin bear clock. It pairs well with the cycle bottom finder, which scores price-level and on-chain conditions rather than duration, and the cycle price tiers, which show where price has spent its time. Definitions for cycle peak, bear market duration and days since peak are in the glossary.