19 Mar, 2026
2 minutes
Cryptocurrency markets go through cycles, and even experienced investors have a favorite phenomenon called "altcoin season." It is considered one of the most thrilling times, where alternative coins outperform Bitcoin and provide high returns for investors. To measure the altcoin season, a metric called the Altcoin Season Index has been introduced by cryptocurrency traders.
Instead of making assumptions about the altcoin season, investors use the Altcoin Season Index to determine if the market is moving towards alternative coins from Bitcoin. It does not forecast the future, but the Altcoin Season Index helps investors determine if the majority of altcoins are performing better compared to Bitcoin over a specific period of time.
Let's learn more about altcoin season, the causes of altcoin season, the signs of altcoin season, and the Altcoin Season Index in the following sections of this guide.
Altcoin season, on the other hand, refers to a phase within the cryptocurrency market when altcoins perform better compared to Bitcoin. Instead of the price of Bitcoin rising, altcoins begin to experience significant growth, hence the altcoin season.
Before delving deeper into the analysis of the Altcoin Season Index, it is vital to comprehend what altcoin season means. Altcoins, as the name suggests, refer to all the cryptocurrencies that are not Bitcoin, such as Ethereum, Solana, XRP, among others.
During Bitcoin season, BTC is leading the market, and most of the attention and liquidity are concentrated here. While altcoins are also going up, they are doing so at a lower rate. Altcoin season, however, is a situation that is characterized by:
a majority of top altcoins outperforming Bitcoin
a fall in the dominance of Bitcoin
a move of capital to riskier assets
Altcoin seasons usually occur after a strong run in Bitcoin. Once Bitcoin has stabilized, investors look to earn higher returns on their assets in other coins. This causes these assets to grow rapidly.
The altcoin season is largely dependent on the behavior of investors. Investors become more confident during this time and are willing to take risks on new altcoins. Knowing what altcoin season is forms the foundation for understanding the altseason index.
However, altcoin season does not start in a vacuum. Several conditions must come into place to signal that capital is about to leave Bitcoin and flow into altcoins. Understanding what leads to altcoin season helps to better understand the movements in the Altcoin Season Index.
Stabilization of Bitcoin after a rally: One of the most common triggers is the stabilization that occurs after Bitcoin has had a significant run and then stabilizes. When Bitcoin stops appreciating rapidly, investors look for better growth opportunities elsewhere.
Decline in Bitcoin dominance: Bitcoin dominance is the percentage share that Bitcoin holds in the total crypto market capitalization. When Bitcoin dominance begins to decline, it usually signals that investors are entering altcoins. A decline in Bitcoin dominance is usually marked by a rise in the altseason index.
Increased appetite for risk. The altcoin season performs well in an environment of high investor confidence. This means that traders, driven by a positive market outlook, will invest in altcoins that have a higher potential to gain more in the market.
Innovation and sector trends. New innovation in the market can lead to a strong altcoin season. For example, a trend in decentralized finance, AI coins, gaming coins, and second-layer coins can lead to a strong altcoin market.
Liquidity conditions. In an environment of high market liquidity, more funds will be injected into the market, and a significant amount of that will go into altcoins, leading to their strong performance in the market.
Market cycle timing. Altcoin season often occurs during the mid-to-late phase in a bullish cycle. Bitcoin tends to perform better during the early phase, while the latter phases have multiple assets participating in the bull run.
These triggers give investors a better understanding of the movements in the Altcoin Season Index and if a real altcoin cycle is underway.
While the Altcoin Season Index offers a quantified metric, veteran traders may also look for other general indicators to show whether altcoins may soon start to outperform Bitcoin. Identifying these early signals can help investors get positioned for an altcoin run before it gains steam.
A gradual reduction in Bitcoin dominance is arguably one of the strongest indicators of this. As Bitcoin's percentage of the overall market decreases over time, it indicates investors are moving their funds into other altcoins.
Altcoin season is not defined by just one altcoin rising. Rather, it's defined by a very high percentage of altcoins rising more than Bitcoin over a specific period of time. As dozens of altcoins simultaneously show stronger gains than Bitcoin, the altseason index tends to rise.
More volume being exchanged in altcoin markets means that the interest level for altcoins is rising. When the level of trade increases beyond Bitcoin and Ethereum, it means the altcoin season has begun.
At times, the altcoin season starts off with a strong run for a specific sector, such as DeFi, AI, gaming, or layer 2 coins. When one sector performs well, the rest of the market follows.
Stories of altcoin bulls, social media, and the involvement of retail investors are also part of the altcoin season. Here, the role of market psychology comes into play.
More higher highs and higher lows for altcoins mean that the trend is strengthening. When the charts are rising, the more confidence that the market has, the faster the cycle grows.
The Altcoin Season Index is meant to gauge if the overall altcoin market is performing better than Bitcoin over a set time frame, usually 90 days. Unlike the traditional index that focuses on one particular coin, this index compares the performance of different leading coins against Bitcoin. In order to understand what is Altcoin Season Index, one has to first understand how the scoring system works.
Typically, this index tracks the performance of the top 50 coins in the cryptocurrency space, based on their market capitalization, excluding stable coins. Next, it measures the number of coins in this space that have performed better than Bitcoin over a certain period of time.
If the majority of altcoins have performed better than Bitcoin, the index increases. Conversely, if Bitcoin dominates the space, the index decreases.
The altseason index usually ranges from 0 to 100:
A score above 75 typically indicates an Altcoin Season
A score below 25 usually indicates a Bitcoin Season
A score between 25 and 75 indicates a neutral zone or a transition phase
Suppose, out of 50 top altcoins, 40 altcoins outperform Bitcoin over a 90-day period.
A high reading implies that capital is distributed across altcoins rather than being concentrated in BTC. This is usually a period of high volatility and risk appetite.
When the index is low, it implies that BTC is performing better than most altcoins. This is usually a period when BTC is leading the market and altcoins are struggling to make any significant moves.
The Altcoin Season Index should not be considered a predictive tool but rather a confirmatory tool. Investors use this index in combination with:
Bitcoin Dominance Charts
Overall Market Trends
Trading Volume Data
Macroeconomic Conditions
By using this index, investors can understand the conditions that are favorable to Bitcoin or other currencies.
The Altcoin Season Index is a tool used to measure whether a majority of the top altcoins are performing better relative to Bitcoin over a set period of time, typically 90 days. It compares the performance of the top altcoins, based on market capitalization, to that of Bitcoin, excluding stablecoins. The index will rise if a majority of altcoins deliver better returns relative to Bitcoin.
A high value of the Altcoin Season Index, above 75, means that a majority of the top altcoins in the market are delivering better performance relative to Bitcoin. This is a positive indication of market conditions, as it points to a high level of market risk appetite, with more capital flowing into altcoins.
Altcoin season is a market condition in which altcoins deliver better performance relative to Bitcoin, while Bitcoin season is a condition in which Bitcoin delivers better performance relative to altcoins. The altseason index helps to determine whether the market is in altcoin season or Bitcoin season based on performance data.
While the index is a valuable tool for sentiment and trend analysis, it is not a predictor of future price movements. It is a reflection of past performance over a given period. It is also often combined with other metrics such as Bitcoin Dominance, Volume, and Market Structure.
The index is also utilized by investors who want to get a better understanding of the market rotation dynamics. For example, a rising index may be a reason for diversified altcoin investment strategies, while a low index may be a reason for focusing on Bitcoin.
