What Is Altseason Index?
The Altseason Index measures whether the broader altcoin market is outperforming Bitcoin over a rolling period (typically 90 days). When 75% or more of the top 50 altcoins outperform BTC, the index enters "altseason" territory. When less than 25% outperform, it's "Bitcoin season."
How Altseason Index Works
The index captures the rotation cycle within crypto: capital flows from stablecoins → Bitcoin → large-cap alts → mid-cap alts → small-cap alts, and then reverses. Altseason typically occurs in the later stages of a bull market when Bitcoin consolidates after a major move and traders seek higher returns in smaller, more volatile assets.
Why It Matters for Traders
The Altseason Index is a portfolio allocation signal. In Bitcoin season, concentration in BTC reduces drawdowns and outperforms. In altseason, diversified alt exposure captures the rotation premium. The transition point — when the index moves from Bitcoin season to neutral — is the optimal time to begin building alt positions. Being early to rotate into alts before altseason fully kicks in captures the bulk of the outperformance.
