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Altcoin season explained: what it is and how to spot it

Every so often, smaller coins rise much faster than bitcoin, and everyone starts saying "altcoin season." Here's what that really means, the 3 charts people use to track it, and the part the hype usually leaves out.

Beginner guide · 7-minute read · Updated 2026-10-21

What "altcoin season" means

An Altcoin is any coin that isn't bitcoin. Ether, Solana's SOL, XRP and thousands of smaller tokens all count.

Altcoin season is a stretch of time when most altcoins rise faster than bitcoin. It's not an official term. It's a nickname traders use.

The opposite, when bitcoin outpaces most altcoins, is sometimes called "bitcoin season."

Why it happens (the usual story)

The common explanation goes like this:

1. Bitcoin climbs first. Big money tends to buy the largest, most-traded coin first.
2. Bitcoin slows down. Traders look for something that might move more.
3. Money moves to large altcoins, like ether.
4. Then to smaller ones. Mood gets hotter. Riskier coins jump.
5. The top. New tokens launch daily. Everyone is talking about it.

That's a description of past booms, not a rule. It doesn't always happen in that order, and some cycles have had only a short or weak altcoin run.

The 3 charts people use to track it

You can look at all of these for free on TradingView.

1. Bitcoin dominance

Bitcoin dominance is bitcoin's share of the total value of all crypto, in percent.

• Dominance falling means altcoins, as a group, are gaining on bitcoin.
• Dominance rising means bitcoin is gaining on the rest.

One catch: stablecoins count in the total. When people sell coins for stablecoins in a sell-off, dominance numbers can shift for reasons that have nothing to do with an altcoin season.

2. The ETH/BTC chart

This shows the price of ether in bitcoin, not in dollars. It's a simple test of whether the biggest altcoin is beating bitcoin.

• ETH/BTC making higher highs and higher lows means ether is outpacing bitcoin.
• Lower highs and lower lows means bitcoin is winning.

You can read it with the same rules as any chart. See higher highs and higher lows.

3. An "altcoin season index"

Some websites publish an index. One well-known version counts how many of the top 50 coins (not counting stablecoins) beat bitcoin over the past 90 days. If 75% or more did, it calls it altcoin season.

Useful as a snapshot. But it only measures what already happened. It can't tell you what comes next.

The part the hype leaves out

Altcoins tend to move harder than bitcoin in both directions.

• In booms, many rise much faster.
• In falls, many drop much further. Drops of 90% or more have been common for smaller coins.
• Many never recover. Lots of the hottest coins from past booms are now worth close to nothing, or gone.

Smaller coins also tend to have:

• Thinner trading, so bigger Spreads and Slippage.
• Big holders who can move price a lot when they sell.
• Token unlocks, when coins held by insiders become free to sell.

Altcoin season and memecoins

At the hottest point of past booms, a flood of joke tokens, called memecoins, launched every day. Most new tokens lose nearly all their value, and insiders and bots usually get in first. Our memecoins explained page covers how they work.

If you look at them at all, only use money you could afford to lose entirely, sized from your risk rules.

How to think about it as a trader

You don't need to call the season. You can let the charts tell you what's happening now.

1. Check bitcoin's weekly trend first. Altcoins rarely do well while bitcoin is falling hard.
2. Check ETH/BTC. Is the biggest altcoin actually beating bitcoin?
3. Stick to coins with real trading volume while you learn. Thin coins are harder to exit.
4. Set your stop from the chart, where your idea is clearly wrong. Altcoins usually need wider stops.
5. Size from the stop. Wider stop, smaller size, same risk. The position size calculator does it.
6. Skip leverage. Altcoin swings can force-close a leveraged trade fast.

Common mistakes

• Buying a coin because it's up a lot this week. Big recent gains often mean big swings both ways. Wait for a clear setup on the chart.
• Spreading money over 20 tiny coins. That's not safer. Many small coins tend to fall together.
• Ignoring what the coin is priced in. A coin can rise in dollars and still lose ground to bitcoin.
• Holding a loser because "alt season is coming." A stop decided in advance takes the guesswork out.

Where this fits in the bigger picture

Altcoin seasons have usually come late in a broader crypto boom, which is part of why they've often ended with sharp falls. See crypto market cycles for that story, and crypto volatility explained for why the swings are so big.

Questions