A Coinbase analyst defined the altcoin season as a period when at least 75% of the top 50 altcoins surpass Bitcoin in terms of market capitalization for more than 90 days.
Duong explained this by the easing of the US Federal Reserve System policy. The US consumer price index for July demonstrated the preservation of inflation at 2.7% year-on-year, so there is a high probability that the regulator will lower interest rates in September. The actions of the Fed motivate retail investors to buy volatile and high-risk assets more actively, Duong explained.
Another factor that could influence the onset of the altcoin season is a decrease in Bitcoin's dominance in the cryptocurrency market. A Coinbase analyst defined the altcoin season as a period when at least 75% of the top 50 altcoins surpass Bitcoin in terms of market capitalization for more than 90 days. Over the past few months, Bitcoin's dominance has decreased by approximately 10%, from 65% in May 2025 to 59% by August.
This is almost the lowest level since the end of January, signaling the beginning of capital flow to the