If you've spent any real time in crypto, you already know the feeling — you're watching your altcoin bag, and Bitcoin just keeps climbing while everything else goes sideways. Or maybe it's the opposite: BTC is consolidating and suddenly some random L2 token you bought six months ago is up 3x. That swing is what the Altcoin Season Index tries to capture, and it does so surprisingly well. This page shows you the live score, updated every five minutes, along with the full breakdown of which coins are actually beating Bitcoin right now.
The Altcoin Season Index is probably the most straightforward market cycle indicator in crypto, which is part of why it caught on so quickly. It was created by BlockchainCenter.net and the concept is simple enough to explain to someone who just discovered crypto last week: look at the top 50 coins by market cap (throw out stablecoins and wrapped assets), check how many of them beat Bitcoin's return over the last 90 days, and express that as a percentage out of 100.
That's it. If 75 or more out of those 50 coins outperformed Bitcoin in the past 90 days, it's officially Altcoin Season. If fewer than 25 did, it's Bitcoin Season. Everything in the middle is a mixed, transitional market where neither narrative has full momentum. CoinMarketCap adopted this methodology, CoinGecko shows it, and it shows up in virtually every serious crypto market analysis you'll read. It became the de facto standard for a good reason — it's objective, reproducible, and historically meaningful.
Why 75% and 90 days specifically? The 75% threshold isn't arbitrary — it represents a genuine supermajority, meaning the outperformance is broad enough to be a real market signal rather than a handful of outliers skewing the numbers. The 90-day window maps roughly to one "season" in market cycle terms: long enough to filter out weekly noise, but short enough to reflect real momentum shifts. These two parameters have held up well across multiple market cycles since the index was introduced.
Our live altcoin season index chart pulls real data from CoinGecko's API, runs the calculation server-side, and caches results for five minutes so the page loads fast even with heavy traffic. You'll also see 30-day and 1-year tabs alongside the standard 90-day reading, which I find genuinely useful for catching early rotation before the main index reacts.
The semicircle gauge at the top gives you the current score at a glance — green end means altcoins are winning broadly, yellow/amber end means Bitcoin is dominating. The needle and color change together so you get an instant read without squinting at numbers.
Below that, the horizontal bar chart is where things get interesting. Each row is one of the top 50 coins, sorted from best to worst performer for whichever time period you've selected. The yellow vertical line on each bar is Bitcoin's own return — coins whose bar extends past that line have beaten BTC; coins that fall short haven't. It's a quick way to see at a glance whether a handful of large caps are carrying the index or whether the outperformance is genuinely distributed.
| Score | Phase | What It Means | General Takeaway |
|---|---|---|---|
| 75–100 | ✦ Altcoin Season | 75%+ of top 50 beating BTC over 90 days | Broad alt exposure has historically done well here |
| 50–74 | Alt-Leaning Mixed | Moderate altcoin outperformance building | Selective positions in higher-conviction alts |
| 25–49 | BTC-Leaning Mixed | Bitcoin still outperforming most alts | Higher BTC allocation makes more sense |
| 0–24 | ₿ Bitcoin Season | BTC dominating — most alts losing ground to BTC | BTC or cash focus; altcoin risk-reward is poor |
The Season (90-day) tab is the original methodology and the number you'll see everywhere else. Use this as your primary reference. The Month (30-day) tab is my personal favorite for catching early rotations — when the 30-day score starts climbing while the 90-day score is still depressed, it often signals that fresh capital is starting to move into alts before the main index confirms it. The Year (1-year) tab is purely for long-term perspective: has holding altcoins over a full annual cycle actually delivered any alpha over just holding Bitcoin? Sometimes the answer is surprisingly no.
The altcoin season index 2026 story has been shaped more by macro forces than most previous cycles. The spot Bitcoin ETF approvals in January 2024 opened up a direct institutional capital pipeline into BTC that simply didn't exist before — and crucially, that capital had no easy path into altcoins. The result was a sustained Bitcoin dominance surge that pushed most altcoins into deep underperformance territory, and the index reflected that for much of early 2026.
If you were watching the altcoin season index may 2026 readings, you would have noticed the first meaningful uptick in months, with AI-adjacent tokens, select Layer-2 projects, and Real World Asset (RWA) protocols leading early rotation out of Bitcoin. This is a pattern worth understanding: altcoin seasons rarely kick off with a broad surge across everything. They usually start with one or two sectors getting hot, pulling up the 30-day score, and only later does the breadth expand enough to push the 90-day score above 75.
The altcoin season index january 2026 reading you see on this page reflects the cumulative 90-day window ending today. Historical patterns suggest that the longer a period of Bitcoin dominance persists, the sharper the eventual rotation tends to be — retail capital that sat on the sidelines waiting for confirmation tends to rush in once the index breaks above 75 decisively. Whether that pattern holds in this cycle remains to be seen.
Both the CoinMarketCap altcoin season index and the original BlockchainCenter altcoin season index use the same 75%/90-day core methodology. You might see our score differ by 1–4 points on any given day — that's normal and comes down to minor differences in which coins qualify for the top 50, how each platform handles stablecoin exclusions, and data timing. None of those differences change the strategic interpretation. A score of 72 on BlockchainCenter and 75 on our tool means the same thing: the market is right at the edge of confirming alt season, worth watching closely.