Every time Bitcoin dominance drops, analysts say altcoin season is coming. But data suggests that the altseason already came and went.
Few things in crypto are as elusive and misunderstood as the concept of an “altcoin season.” Traditionally, this term referred to a brief window — usually 2–3 months — following a Bitcoin (BTC) price rally, where altcoins outperform BTC in cumulative returns. That pattern held in the 2015–2018 and 2019–2022 cycles, but the verdict is not yet in on whether the current bull market has had its altcoin season.
The Blockchain Center defines an altcoin season as a period when 75% of the top 50 altcoins outperform Bitcoin over a rolling 90-day timeframe. Its Altseason Index registered upticks in March 2024 and again in January 2025 — but neither lasted long enough to qualify as a full-fledged altseason.
Altcoin season index. Source: Blockchain Center
