The altcoin season in 2025 has not occurred yet and, judging by the metrics, is not anticipated in the short term. Bitcoin remains strong. The altcoin season index shows from 33% — for the top 100 coins by market capitalization — to 45% — for the top 50. This is quite far from the necessary 75%.
The last altcoin season was observed in December 2024, when the index rose above the 85 mark. However, this period lasted very briefly — while the bitcoin season could be seen in May, June, and July 2025.
