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Learn how market analysts track altcoin seasons using the CoinMarketCap index and Bitcoin dominance metrics to understand crypto capital rotations.
The cryptocurrency market often follows a cyclical pattern where capital rotates between Bitcoin and alternative assets, a phenomenon frequently referred to as "Altcoin Season" [1]. This period is formally identified when at least 75% of the top 100 cryptocurrencies—excluding stablecoins and wrapped tokens—outperform Bitcoin over a rolling 90-day period [1].
Key takeaways
Bitcoin dominance, or BTC.D, acts as a barometer for market sentiment and capital allocation [2]. When BTC.D rises, it generally indicates that capital is moving into Bitcoin, which often leads to altcoins underperforming or consolidating [2]. Conversely, when Bitcoin stabilizes following a major rally, traders may rotate profits into altcoins, causing BTC.D to decline and potentially triggering an altcoin season [2].
During these periods, market characteristics often include increased altcoin dominance and rapid price appreciation across various sectors [1]. For instance, during the Altcoin Season observed between February and May 2021, large-cap altcoins saw returns of 174% compared to Bitcoin’s 2% [1]. This environment is frequently accompanied by a "fear of missing out" (FOMO) mentality, characterized by high 24-hour trade volumes and increased buying pressure [1].
To navigate these cycles, traders often monitor the CoinMarketCap Altcoin Season Index, which provides a daily updated score from 1 to 100 based on the performance of the top 100 assets relative to Bitcoin [1]. Analysts suggest that this data can help visualize market sentiment, as altcoin seasons often follow a predictable sequence: Bitcoin prices rise, Ethereum activity increases, and eventually, capital rotates into a broader range of narratives and projects [1].
While BTC.D is a useful tool for identifying potential rotations, experts caution against treating it as a guarantee of performance [2]. Effective risk management during these phases involves maintaining position limits, using stop-losses, and avoiding over-leveraging during sudden Bitcoin price movements [2]. By combining BTC.D trends with technical analysis, volume confirmation, and on-chain metrics, participants aim to improve the probability of successful trades rather than relying on a single indicator [2].
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AI-assisted synthesis by the TrendWatcher Editorial Desk · sourced from 2 outlets · Jun 12, 2026 · How we report
An altcoin is any cryptocurrency other than Bitcoin, as Bitcoin was the first to capture global attention.
The index compares the 90-day price performance of the top 100 cryptocurrencies, excluding stablecoins and asset-backed wrapped tokens, against Bitcoin.
During this period, altcoins typically experience rapid price appreciation, increased market dominance, and higher trading volumes, often driven by market optimism and FOMO.
Understanding these metrics is significant because they provide a framework for observing how capital moves through the cryptocurrency ecosystem [2]. As market conditions shift, the ability to interpret whether the market is in a "Bitcoin Season" or "Altcoin Season" allows for more informed decision-making regarding asset allocation [1]. Moving forward, the continued monitoring of these indices and dominance charts remains a primary method for those attempting to track the evolving stages of the broader crypto market [1].
Yes, Ethereum is included in the altcoin mix for the purpose of the CoinMarketCap Altcoin Season Index.