Again in September 2025, the Altcoin Season Index, which tracks the efficiency of the highest 100 altcoins in opposition to that of Bitcoin, had reached a brand new yearly peak. This rise had triggered constructive sentiment available in the market, with requires the altcoin bull run to lastly start. Nevertheless, the tide has since turned, and hopes for one more altcoin season have been dashed. Now, the index has crashed again downward, transferring towards its yearly lows.
Altcoin Season Index Falls To 39 From 78
The Altcoin Season Index on the CoinMarketCap web site has declined to a rating of 29, representing an over 50% crash from its September highs. Again then, the Altcoin Season Index had climbed to a rating of 78, suggesting that altcoins had been in a bull market. Nevertheless, this transfer was short-lived with the market crash that adopted, particularly within the month of October.
This index takes into consideration how the highest 100 altcoins by market cap have carried out in opposition to the Bitcoin worth over a 90-day interval and makes use of it to attain the chart. The extra altcoins are outperforming Bitcoin throughout this timeframe, the upper the rating on the index.
A rating of 29 implies that solely 29 altcoins of the highest 100 have seen higher efficiency in comparison with the Bitcoin worth over this 90-day interval. The likes of Binance-backed ASTER and ZCASH’s ZEC lead this record after seeing an over 900% improve every throughout this time.

Curiously, the Ethereum worth seems within the record of altcoins outperforming the market chief, coming in with a 5.18% improve for ETH in comparison with the 4.32% decline suffered by Bitcoin on the time of writing.
What This Means For Altcoins
The present rating of 29 on the Altcoin Season Index represents the poor efficiency of altcoins over the previous couple of months, as they had been particularly rocked by the October 10 crash. Nevertheless, this isn’t utterly dangerous information for the altcoin market, going by historic efficiency.
Trying again, a bull run has at all times begun when the index falls to low ranges. Earlier than the September 2025 rally, the Altcoin Season Index had fallen under 40 earlier than marking a backside. Thus, the present low index rating, coupled with market sentiment declining into worry, might counsel {that a} backside is shut.
Featured picture from Dall.E, chart from TradingView.com
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