Altcoin Season 2026: A Complete Guide to Timing and Indicators

Few crypto market terms are used as frequently (or as loosely) as altcoin season. During every bull market, the label is applied to virtually everything, from short-lived rallies to broader market uptrends.

What, then, actually qualifies as altcoin season? This is the question that we will focus on answering in this article.

1Altcoin Season: The Crypto Market's Recurring Phenomenon

Altcoin season (or altseason) is a market phase in which a broad range of altcoins outperform Bitcoin over a sustained period. 

To understand what an altseason looks like, it helps to see how it comes about in the first place. 

Most of the time, the scene unfolds when a crypto bull market happens - as prices are rising and people (even those who are not investors) start wanting to place money into the market. Bitcoin has historically been the first destination for much of that investment, given its largest, most liquid, and most established cryptocurrency title.

Altcoin season is a sustained market phase where altcoins broadly outperform Bitcoin.

Once Bitcoin's rally begins to slow, capital has historically shifted to Ethereum. This is thanks to many investors becoming more willing to step further along the risk curve looking for higher potential returns.

If bullish conditions persist, capital will often expand into large-cap altcoins before spreading to mid-cap and smaller projects. At the same time, participation will broaden across multiple sectors in altcoin season. This can include Layer 1 blockchains, DeFi, AI, gaming, DePIN, and Real-World Assets (RWAs).

In reality, however, this broader capital rotation rarely unfolds in a perfectly orderly way. Therefore, investors have to constantly look for evidence that altseason is already underway.

2How to Identify Altcoin Season

For the record, different indicators will capture different aspects of market behavior, and so you will need to know which is which to more accurately pinpoint an altcoin season.

The Altcoin Season Index: A Useful Starting Point

The Altcoin Season Index, popularized by BlockchainCenter, is one of the most widely used tools for assessing whether the market is in altcoin season. It does so by measuring how many of the top 50 cryptocurrencies by market capitalization have outperformed Bitcoin over the previous 90 days.

It is worth mentioning that BlockchainCenter excludes stablecoins, wrapped assets, and certain asset-backed tokens from the Altcoin Season Index due to these assets not accurately reflecting genuine capital rotation into altcoins.

This exclusion is also why different platforms may report different Index values at the same moment. Variations in the assets included, exclusion rules, and update frequency can all affect this score.

Regardless, the resulting score can (typically) all be interpreted using three thresholds:

• Above 75: This means at least 75% of tracked altcoins have outperformed Bitcoin, and Altcoin Season is in full swing.

• Below 25: Fewer than 25% have outperformed Bitcoin. The market is still deep in Bitcoin Season.

• Between 25 and 75: Scores falling within this range indicate a transitional market where neither Bitcoin nor altcoins clearly dominate.

The Altcoin Season Index measures how many top 50 cryptocurrencies have outperformed Bitcoin over 90 days.

In practice, Altcoin Season Index is best suited to be a confirmation tool. Because this index looks back over the previous 90 days, by the time the score rises above 75, capital will likely have been rotating into altcoins for weeks.

So, which tools can investors look into to make more educated predictions and not miss out on the best price windows that this market phase has to offer?

Looking Beyond the Altcoin Season Index

Beyond the Altcoin Season Index, investors can assess altseason using multiple indicators.

Bitcoin Dominance (BTC.D)

Bitcoin Dominance (BTC.D) measures Bitcoin's share of the total cryptocurrency market capitalization. Generally, a falling BTC.D would point investors towards the direction of an altcoin season.

However, it is not nearly enough to know that Bitcoin dominance is falling, since it does not reveal where capital is flowing next. Investors, then, are inclined to find where the money is flowing. The first name that comes to mind would likely be Ethereum, which brings us to the next metric.

ETH/BTC

The ETH/BTC trading pair measures Ethereum's performance relative to Bitcoin. A sustained uptrend in ETH/BTC suggests expansion of investors' risk appetite into ETH.

That said, in a genuine altcoin season, money flow would not surround just these 2 assets.

The next question naturally becomes whether rallies are spreading across the broader altcoin market.

TOTAL2, TOTAL3, and Market Breadth

This broader participation is commonly referred to as market breadth, and two commonly used indicators for assessing it include TOTAL2 and TOTAL3.

As TOTAL2 tracks the combined market capitalization of all cryptocurrencies except Bitcoin, it can be useful for seeing whether money is flowing into altcoins overall.

TOTAL3 goes one step further by excluding both Bitcoin and Ethereum. This helps reveal whether capital is spreading beyond the market's two largest cryptocurrencies into mid-cap and smaller projects.

Volume and Liquidity

Even when all of the above indicators suggest that altcoin season may be developing, it is still important to ask whether the rally is supported by healthy market activity.

Your first clue lies in trading volume. Rising prices accompanied by consistently higher volume indicate that the rally is attracting trading activity.

As trading activity increases, liquidity often improves as well. More buyers and sellers participating in the market would allow larger orders to be executed with less impact on price. This, in turn, makes rallies much more stable and resilient.

3Historical Patterns and Duration

To understand how the signals pointed out above play out in real markets, it would perhaps be useful to examine previous altcoin seasons.

The 2017-2018 Cycle

This period is widely regarded as the first large-scale altcoin season. As Bitcoin's bull market attracted new participants to crypto, Initial Coin Offerings gave investors access to a rapidly growing number of blockchain projects. This greatly encouraged capital to spread across the broader altcoin market.

The 2017-2018 cycle marked the first major altcoin season.

According to CoinGecko, Bitcoin Dominance fell from roughly 86% to below 40% between early 2017 and January 2018. Over this same period, the combined market capitalization of altcoins also grew from around $30 billion to more than $600 billion.

Unfortunately, the rally ultimately proved unsustainable. As reported by Yahoo Finance UK, many ICO-era tokens lost more than 90% of their value during the 2018 bear market, while numerous projects disappeared altogether.

The 2020-2021 Cycle

The 2020–2021 cycle unfolded differently. Rather than expanding across the altcoin market all at once, capital rotated through a series of sectors as investor confidence gradually increased.

The 2020-2021 altcoin cycle developed through rotating narratives.

The first major wave emerged during DeFi Summer in 2020, when decentralized finance became the market's dominant theme. According to Decrypt, total value locked (TVL) across DeFi protocols grew from roughly $700 million at the beginning of the year to more than $15 billion by year-end.

As the bull market matured, capital gradually expanded beyond DeFi into NFTs, blockchain gaming, metaverse-related projects, and other emerging narratives. This increasingly broad participation was reflected in Bitcoin Dominance, which declined from above 70% to around 40% over the course of the cycle.

4Common Risks During Altcoin Season

Market Risks: Volatility and Liquidity

Altcoins are generally more volatile than Bitcoin. During altcoin season, this means prices can reverse much more quickly once market sentiment changes.

A major reason for this phenomenon is liquidity. Many altcoins trade with relatively thin order books, so even modest buying or selling activity can move prices significantly. As a result, investors may mistake liquidity-driven price swings for evidence of strong market demand or a sustainable uptrend.

Altcoins' prices can rise or reverse quickly and may reflect thin order books.

Project Risks: Tokenomics Still Matters

Altcoin season can improve conditions across the broader market, but it does not change the fundamentals of individual projects.

Survivorship bias often makes this easy to overlook. Investors tend to remember the projects that recovered after previous altcoin seasons, while the thousands that failed receive far less attention. Looking only at those winners can create the misleading impression that most altcoins eventually rebound after every cycle.

Altcoin season does not erase project-specific risks.

Investor Risks: Leverage and FOMO

During altcoin season, rapid price appreciation can create the impression that gains are easy to achieve.

One common response is the use of leverage through perpetual futures or margin trading. While leverage can amplify profits, it also magnifies losses and increases the risk of liquidation if prices reverse unexpectedly.

Another reaction is buying assets whose prices are already sky-high because of social media hype without any independent analysis. Fear of missing out (FOMO), most of the time, is what inspires this kind of behavior.

Altcoin season can fuel leverage and FOMO.

At the end, our advice is that altcoin season should not change the principles of sound investing. Position sizing, diversification, liquidity, and project quality remain just as important during periods of strong market performance as they are in any other market environment.

5A Final Word on Altcoin Season 

Ultimately, no article (including this one) can tell you exactly when the next altcoin season will begin. What it can do, though, is guide you to gather evidence and interpret market signals. This will in turn allow you to make more informed decisions based on a broader understanding of market structure rather than headlines or short-term excitement.

If you're looking for more crypto explainers, market insights, and project breakdowns written with this same approach, Coinminutes has just what you're looking for. Visit https://coinminutes.com/ to stay up to date with our latest research.