# What Is Altcoin Season? Index Data and Market Signals

**Published:** 2026-06-12T11:50:31.231Z  
**Topic:** Altcoin Season  
**Sentiment:** neutral  
**Publisher:** TrendWatcher — https://www.trendwatcher.in/article/c802c8c4-92e0-4e70-b364-acb8c2584033

The Altcoin Season Index measures market performance against Bitcoin. Current data shows mixed signals as traders watch for capital rotation.

The Altcoin Season Index, a benchmark used to gauge whether alternative cryptocurrencies are outperforming Bitcoin, currently sits at approximately 35, indicating that a broad market rotation has not yet begun [3]. This metric serves as a primary tool for investors to determine if the market has entered a phase where the majority of digital assets are generating superior returns compared to the market leader [1].

**Key takeaways**
*   Altcoin Season is officially defined when 75% of the top 100 coins outperform Bitcoin over a 90-day period [1].
*   As of May 2026, the index is at 35, meaning the market is in a transition zone rather than a full Altcoin Season [3].
*   Bitcoin dominance remains high at roughly 60%, a level that historically must drop before altcoins can rally broadly [3].
*   The index excludes stablecoins and asset-backed tokens

## Sources
1. CoinMarketCap — [Crypto Altcoin Season Index | CoinMarketCap](https://coinmarketcap.com/charts/altcoin-season-index/)
2. Coinglass — [Altcoin Season Index, Cryptocurrency Altcoin Season... | CoinGlass](https://www.coinglass.com/pro/i/alt-coin-season)
3. Medium — [Altcoin Season 2026 Is NOT Here Yet. But These 4 Signals... | Medium](https://medium.com/coinmonks/altcoin-season-2026-is-not-here-yet-but-these-4-signals-will-tell-you-exactly-when-it-is-ce5ea0e07f0b)

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Cite as: TrendWatcher, "What Is Altcoin Season? Index Data and Market Signals", https://www.trendwatcher.in/article/c802c8c4-92e0-4e70-b364-acb8c2584033