Speculation of a new “alt season” has flared again after recent rallies in several altcoins and a fresh all-time high for Hyperliquid. But a closer look at the data shows those gains are more isolated than systemic — and the market isn’t signaling a broad shift away from Bitcoin yet.
How the market judges “alt season”
The most widely cited gauge for an alt season is the Altcoin Season Index, which compares the performance of the top 100 altcoins against Bitcoin over a rolling 90-day window and expresses the result as a score from 1 to 100. Historically, readings above about 75 indicate a true alt season — meaning roughly 75% of those top 100 altcoins have outperformed Bitcoin over the past three months.
What the numbers say now
According to Coinglass, the Altcoin Season Index currently sits at 36 — far below the 75 threshold. At the same time, Bitcoin dominance actually ticked up over the weekend, rising above 59.88% by Sunday. Those two datapoints argue against the view that we’ve entered a broad alt season: Bitcoin remains the primary driver of market movement, not a capital rotation into alts.
Why rallies aren’t the whole story
Individual altcoins can and do spike — Hyperliquid’s new all-time high is a good example — and some top-100 tokens have outperformed Bitcoin over short windows. But the index and BTC dominance suggest these moves are spot rallies rather than the widespread outperformance that defines an alt season. Ethereum, historically the bellwether altcoin, is also underperforming Bitcoin right now; historically, ETH leadership has been a key precursor to broader alt strength.
What to watch next
If traders are hunting for signals of a genuine alt season, look for three things: the Altcoin Season Index moving sustainably above ~75, a clear and sustained decline in Bitcoin dominance, and Ethereum beginning to outperform BTC. Until those conditions align, current altcoin strength looks more like selective rallies than a market-wide rotation.
Bottom line
While exciting rallies in select projects can create sharp short-term opportunities, the data does not yet support a full-blown alt season. Monitor the index, BTC dominance, and ETH vs BTC performance to separate fleeting pumps from a structural market shift.
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