Altcoin Season Index
Altcoin season index today: 64 (Leaning altcoin)
32 of the 50 largest coins beat Bitcoin over the 90 days to Sep 27, 2026.
Altcoin Season Index
64/100Leaning altcoin
Sep 27, 2026+12 in 7 days
- Yesterday
- 64
- Last week
- 52
- Last month
- 34
- 1Y high
- 80
- Oct 2, 2025
- 1Y low
- 10
- Dec 11, 2025
32 of the top 50 beat Bitcoin
Each bar is a coin's distance from Bitcoin over 90 days; the number is its own change.
How it is calculated
Each day, take the 50 largest coins by market cap, leaving out stablecoins and wrapped, staked and tokenised assets. Count how many rose more than Bitcoin over the previous 90 days. The index is that share, from 0 to 100.
Ranks are real from Sep 16, 2026. Before that, a coin's past market cap is estimated as its price that day times its supply today, so older values are an estimate. The history starts on Jan 19, 2021, the first day with at least 40 coins to count.
Questions
When was the last altcoin season?
The index last stood at 75 or more on Oct 3, 2025, and that run peaked at 80.
When was the last Bitcoin season?
The index last stood at 25 or less on Sep 1, 2026, and that run bottomed at 24.
How often is it updated?
Once a day, after the 02:00 UTC snapshot of the top coins. The last 14 days are recalculated each time, as late prices arrive.
Not a forecast. Not financial advice. Prices: daily closes from Binance and KuCoin, and the site's daily CoinGecko snapshot from Sep 16, 2026. Last updated Sep 27, 2026.