Altseason explained: when alt coins outperform Bitcoin

By Ken Chigbo, Founder, KenMacro. Published 2026-05-13.

What is altseason?

Altseason describes a recognisable market regime in crypto where the majority of altcoins post percentage gains greater than Bitcoin over weeks or months. The term has no strict academic definition, but practitioners often reference the Altcoin Season Index, which considers a season active when roughly three quarters of the top fifty altcoins outperform Bitcoin on a rolling ninety day basis. Altseasons usually emerge after Bitcoin completes a strong directional move and then consolidates, freeing risk appetite to flow down the capitalisation curve into Ethereum, large caps, then smaller speculative tokens.

How traders use altseason

Retail traders use altseason as a regime label that shapes positioning. When Bitcoin dominance, the BTC share of total crypto market capitalisation, rolls over from a local high while total market cap holds firm, many traders rotate exposure from BTC into ETH and large cap alts, then progressively into smaller caps as momentum broadens. Institutional desks treat altseason more cautiously, since liquidity in small caps is thin and slippage on size is material. They tend to express the view through Ethereum, liquid layer one tokens, or basket products rather than long tail names. Risk managers watch correlation structure carefully, because altseasons often end abruptly when Bitcoin makes a sharp directional move and the entire complex re-correlates.

Common misconceptions about altseason

The first misconception is that altseason is a calendar event. It is not scheduled, it is a behavioural regime that emerges from capital rotation and risk appetite, and several cycles have passed without a clean altseason at all. The second is that all altcoins rally together. In practice, dispersion is wide: a handful of narratives carry the index while many tokens drift or bleed. The third is that altseason is a low risk environment because everything is rising. Drawdowns of fifty per cent or more in individual alts are common even inside a strong season, and the exit phase tends to be violent.

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Frequently asked

How do traders know when altseason has started?

There is no single trigger, but practitioners look at a cluster of signals: a falling Bitcoin dominance reading, rising total market capitalisation excluding BTC, broadening participation across the top one hundred tokens, and the Altcoin Season Index sitting above its seventy five threshold. Sentiment indicators, funding rates on perpetual futures, and stablecoin inflows into exchanges add context. No single metric is decisive, and false starts are common, particularly during sideways Bitcoin price action.

How long does an altseason typically last?

Historical episodes have ranged from a few weeks to several months, with no fixed duration. The 2017 cycle produced an extended altseason that ran for much of the final quarter, while the 2021 cycle saw two distinct waves separated by a sharp drawdown. The desk treats duration as path dependent on Bitcoin’s behaviour, macro liquidity conditions, and the strength of prevailing narratives such as decentralised finance, layer two scaling, or artificial intelligence tokens.

Is altseason the same as a bull market?

No. A crypto bull market refers to a broad uptrend in the asset class, usually led by Bitcoin. Altseason is a sub-phase within that broader trend, defined specifically by altcoins outperforming Bitcoin on a relative basis. It is entirely possible to have a bull market with no altseason, where Bitcoin leads and dominance stays high, and it is possible to have brief altseason rallies inside an overall bear market that fade quickly.

What ends an altseason?

Altseasons typically end when Bitcoin makes a sharp directional move, either up or down, that pulls capital and attention back to BTC. A sudden risk off event, such as a macro shock or a major exchange failure, also tends to compress the entire complex as correlations rise toward one. Internally, altseasons end when marginal buyers are exhausted and rotation no longer pushes prices higher, leaving thin order books vulnerable to rapid declines.

Educational analysis only. Past performance does not guarantee future results. Manage risk against your own portfolio.