The Altcoin Season Index dropped to 12 in June 2025, its lowest value since June 2023.
A repeating annual print shows index lows invariably occurring around June from 2019 through 2025.
Since early 2024, the index has remained below 30, confirming sustained market appreciation for BTC over altcoins.
In June 2025, the Altcoin Season Index, a scale that tracks the momentum of Bitcoin and altcoins, reached a low of 12. This is the lowest figure we have seen for the index since June 2023. The value at the present time positions the market squarely into Bitcoin Season, where the price of Bitcoin manages to be above most of the top 50 altcoins. The index is attained between 0 and 100. When a score is below 25, we are in a position of Bitcoin Season, and a score above 75 is a sign of Altcoin Season.
June Records Show Repeating Downtrend
The past shows a repetitive cycle in the month of June. Between 2019 and 2025, the Altcoin Season Index recorded a low every June. Specific lows were felt back in June of 2019, June of 2020, July of 2021, June of 2022, June of 2023 and June of 2024 and the most recent was felt in June of 2025. Altcoins performed poorly relative to Bitcoin each of these times in the market. This trend has been quite similar throughout the several years.
Source: CryptoMichNL (Altcoin Season Index)
The index indicated severe movements between August 2019 and early 2021. The indices fluctuated around the 75 and the 25 mark various times. In 2021, the index peaked near 100, showing a brief but strong Altcoin Season. Following this, the trend reversed and the index declined toward Bitcoin Season levels.
In 2022, the index stayed low, dropping significantly by June that year. This marked another phase of Bitcoin dominance. In late 2022, the index began to recover. That recovery continued into early 2023, reaching values above 75 again. However, this recovery did not last long. By mid-2023, the index fell again, repeating the same cycle.
Consistent Mid-Year Downturns Continue
The data indicates a consistent cycle where mid-year marks the lowest altcoin performance. June has consistently recorded these lows over six consecutive years. In June 2025, the index reached 11, its lowest since June 2023. That reading once again confirmed a market shift toward Bitcoin.
From late 2024 through June 2025, the index trended downward. It stayed mostly within the 10 to 30 range, indicating prolonged Bitcoin control. There was no return to the Altcoin Season range during this time. The market maintained its focus on Bitcoin over alternative cryptocurrencies.
Historically, the index moved between these Bitcoin and altcoin ranges, showing cycles in asset preference. The current data confirms a trend heavily weighted toward Bitcoin dominance. The index has not approached the upper range since early 2024. The June 2025 reading continues that pattern.
