What is altcoin season?

Do you see Bitcoin moving a little while many other coins climb noticeably more? That’s the picture we usually associate with altseason. Think of a race: we don’t just look at whether the runners are moving forward, but at who is running faster than Bitcoin. Comparing returns is the key element, not just green on the price board.

A period like this can emerge when interest, and part of the capital, shifts from Bitcoin to other cryptocurrencies. New applications, popular token categories and a greater appetite for risk can fuel this move. But there is no set sequence, and no rule that every Bitcoin rally is followed by altcoin season.

Why it matters

For anyone who follows or holds crypto, the term describes where the market’s momentum is concentrated. If an altcoin rises in euros but less than Bitcoin, it has a positive return in euros but lags behind in a head-to-head comparison. Likewise, relative outperformance doesn’t guarantee a profit: a coin may simply be falling less than Bitcoin.

One indicator people watch is Bitcoin dominance, i.e. its share of the total market cap. A decline can accompany strength in altcoins, but it isn’t enough on its own to confirm altseason. You need to look at how many coins are outperforming, for how long, and on what trading volume.

What to watch out for

There is no universally accepted definition with a specific duration or thresholds. Different altcoin season indexes use different sets of coins and time frames, so they may paint a different picture on the same day. A sharp rise in a few popular tokens doesn’t necessarily mean a broad altcoin season.

We consider the term useful for describing the market, not as a trading signal. Not all altcoins rise together, and in coins with limited liquidity, moves can reverse abruptly. The fear of “missing the boat” can easily overshadow checking the project itself and its risks.