Altcoin season seems able to kickstart because the Ethereum worth has been outperforming the value of Bitcoin throughout this time. Earlier bull cycles have confirmed that each time ETH begins outperforming BTC, then an altcoin season is across the nook. This was the case again in 2021, and a glimpse of this was proven again in Might 2025. Now, once more, as Ethereum widens the hole towards Bitcoin, altcoins look primed to start their subsequent rally.
Ethereum Strikes 24% Forward Of Bitcoin
Within the month of July to this point, the Bitcoin worth has already rallied to a number of new all-time highs, even climbing above $23,000 earlier than correcting again downward. This has led to double-digit positive aspects for the month for BTC, with CryptoRank information placing it at an over 12.3% climb to this point this month.

In contrast to earlier months when the Ethereum worth had trailed behind Bitcoin, ETH is now within the lead by way of positive aspects. The second-largest cryptocurrency by market cap is already up by greater than 45% this month alone after crossing the $3,100 degree. This places it 33% forward of Bitcoin, signaling a flip within the development.

The final time that the Ethereum worth outperformed Bitcoin in 2025 was again in Might, when ETH rallied 41.1% on the month in comparison with BTC’s 11.1% on the month. That very same month, main altcoins shot up quickly, with many rising 50-100% throughout this time interval.
Taking this historic efficiency under consideration, the altcoin market is already having fun with the dividends of Ethereum’s outperformance. Nonetheless, new all-time highs nonetheless stay elusive for ETH regardless of the BTC worth being nearly double what it was the final time ETH peaked at $4,800.
ETH Nonetheless Driving Altcoin Season
Ethereum’s outperformance carries the promise of an altcoin season as giant altcoins have rallied alongside it. Over the past 90-day interval, which is used to calculate the Altcoin Season Index, the ETH worth is up over 125% in comparison with Bitcoin’s roughly 41.5% throughout this time interval.
The Altcoin Season Index from CoinMarketCap has additionally moved above the 43-point mark, which means m43 of the highest 100 altcoins by market cap are presently outperforming Bitcoin. Whereas this determine signifies that the altcoin season has not begun but, it’s a step in the proper route.
Often, altcoin season is taken into account in full swing when the index reaches the 75% mark. Because of this 75 out of the highest 100 altcoins outperform Bitcoin over a 90-day interval. Then, as soon as the index crosses the 90% mark, with 90 of altcoins outperforming, it’s thought of the highest of the altcoin season.
Featured picture from Dall.E, chart from TradingView.com
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