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.