Key Takeaways
Altseason is when altcoins outperform Bitcoin.
Historically, Altcoin Season Index levels around 20 often mark the start of massive rallies.
Traders use this zone to prepare for rotations from BTC to altcoins.
What Is Altseason and Why Should You Care?
Altseason (short for Altcoin Season) refers to periods when altcoins gain significantly more than Bitcoin. This typically occurs when traders shift capital from BTC to altcoins, resulting in sharp upward movements in altcoin prices.
In simple terms, if Bitcoin slows down after a pump, traders look for higher returns elsewhere—often in mid- and low-cap coins.
The Altseason Index: Understanding the Key Indicator
The Altcoin Season Index is a tool developed by Blockchain Center that tracks market behavior. If 75% of the top 50 coins (excluding stablecoins) outperform Bitcoin in 90 days, we are in an “Altseason.”
The index ranges from:
0–24: Bitcoin Season
25–49: Neutral Zone
50–100: Altseason
Historical Chart: The Altseason Spark Zone (~20 Level)
As seen in the image above, Altseason has consistently sparked off around the 20 level. This “spark zone” has acted like a pressure point—when the index touches it, a reversal into Altseason often follows.
Highlighted zones on the chart show previous instances:
December 2020
July 2021
July 2022
January 2024
Now (July 2025)
Each of these moments was followed by significant rallies in ETH, SOL, ADA, and meme coins like PEPE, FLOKI, and BONK.
Why Altseason Might Be Approaching in 2025
We’re currently in a similar pattern, and the index is again at the 20 level. Combined with:
A cooling Bitcoin rally,
High ETH inflows,
Meme coin resurgence,
We may be at the early stage of a new Altseason.
How to Prepare for Altseason
Rebalance Your Portfolio
Shift some of your BTC profits into strong altcoins or trending low-caps.
Watch the Metrics
Keep an eye on:
BTC dominance,
Total3 chart (alt market cap without BTC & ETH),
Ethereum gas fees (a proxy for network activity).
Think Long-Term
All seasons can be short. Use proper risk management and don’t chase pumps.
Closing Thoughts
The Altseason Spark Zone around 20 on the Altcoin Season Index has consistently marked the beginning of altcoin rallies. We’re now entering this zone again in 2025.
Is this the moment to rotate into altcoins? History says: Keep an eye out.
