Altcoin Season Index: How to Identify the Real Altcoin Season
Key Takeaways
- The Altcoin Season Index measures the 90-day performance of the top 50-100 altcoins vs Bitcoin
- Values above 75 signal an official "Altcoin Season" with broad outperformance
- Portfolio allocation should be guided by index ranges: Bitcoin Season (75% BTC) vs Altcoin Season (75% Alts)
- Actively use platforms like Blockchain Center, CoinMarketCap, and CoinGlass to track trends
The Altcoin Season Index
The Altcoin Season Index influences millions of trading decisions every day. But when exactly do altcoins like Ethereum, Solana, or Cardano actually outperform Bitcoin? Every crypto investor asks themselves this question: How do I find the best timing for my trades?
What is the Altcoin Season Index?
The Blockchain Center Altcoin Season Index is a market indicator that measures the performance of altcoins compared to Bitcoin. It indicates whether the crypto market is currently in an "Altcoin Season" or a "Bitcoin Season." This distinction is crucial for successful trading strategies and portfolio allocation.
The index is a sentiment gauge. It helps investors identify capital movements between Bitcoin and other cryptocurrencies at an early stage.
By measuring relative performance data, complex market dynamics are translated into a simple number.
Calculation and Functionality
The calculation is based on a rolling 90-day period.
This timeframe filters out short-term volatility and focuses on sustainable performance patterns.
The 90-day window has proven to be optimal for distinguishing genuine market shifts from temporary fluctuations.
Calculation steps:
- Selection of the top 50-100 cryptocurrencies by market capitalization (CoinMarketCap ranking)
- Calculation of the 90-day performance of each altcoin
- Comparison with Bitcoin performance
- Counting the altcoins that outperform Bitcoin
- Conversion into a percentage and scaling to 0-100
The 75% Rule:
As soon as 75% or more of the considered altcoins outperform Bitcoin over 90 days, the "Altcoin Season" officially begins. Values below 25 signal a "Bitcoin Season."
Stablecoins like USDT, DAI, and USDC are excluded.
Tokens such as WBTC or stETH are also not taken into account.
Scale from 0-100:
- 0-25: Bitcoin Season
- 26-50: Transition phase
- 51-74: Altcoin momentum
- 75-100: Altcoin Season
Current Market Situation
The Altcoin Season Index on CoinGlass reached values between 76 and 82 in September 2025. These are the highest levels since December 2024 (peak of 88 according to FXStreet). These values signal a clearly confirmed Altcoin Season.
The total altcoin market capitalization is $1.63 trillion according to Cointelegraph and is approaching the all-time high of $1.7 trillion.
Trading Strategies & Portfolio Allocation
At low index values (0–25), a focus on Bitcoin accumulation and reduced altcoin exposure is recommended (TradingView Bitcoin Dominance).
At values above 75, diversification into top altcoins, sector rotation, and risk-on positioning are advisable (Token Metrics AI Guide).
Optimal entry points are index values between 50–60 (early altcoin accumulation).
From index 75, the Altcoin Season is considered confirmed.
Portfolio table structure:
Providers & Tools
Compare multiple platforms for the Altcoin Season Index:
- Blockchain Center Index
- CoinGlass Tracker
- CryptoRank Charts
- Token Metrics AI Trading
- CoinMarketCap Index
Each platform has its own calculations and sample sizes. For example, one platform compares the top 50 coins, while another uses the top 100 coins. This leads to small discrepancies.
Conclusion:
Monitor the Altcoin Season Index daily on the most important chart platforms. Adjust your portfolio and trading strategies to the current market phase. Linked sources in the text allow for quick reference. Save the article to come back to it later. This is how you identify trends early and profit from them.
FAQ – Frequently Asked Questions
What does an Altcoin Season Index of 75 mean?
A value of 75 or more shows that at least 75% of the top altcoins have outperformed Bitcoin in the last 90 days. That is when the "Altcoin Season" officially begins. Source: Blockchain Center
Which coins are included in the index?
The top 50 to 100 cryptocurrencies by market capitalization. Stablecoins and tokens like WBTC or stETH are excluded. See CoinMarketCap
How often is the index updated?
The index is recalculated daily. More on this at CoinGlass.
Can the index predict future price movements?
It shows market sentiment and trend transitions, but it is a confirmation instrument, not a predictive one. More details in the Token Metrics AI Guide.
Which platforms offer an Altcoin Season Index?
All leading tools: Blockchain Center, CoinGlass, CryptoRank, CoinMarketCap.
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