What is Altcoin Season? When is Altseason in August 2026?

Altseason refers to a short period when capital shifts from Bitcoin (BTC) to altcoins, leading to a rapid, notable rise in most cryptocurrencies' prices. Altcoin season, commonly known as "altseason," is characterized by massive gains and high volatility.
 

Over a relatively brief period (typically weeks or months), altcoin prices soar as investors shift funds from Bitcoin to other coins. As prices begin to climb and the altcoin season index trends upward, FOMO (fear of missing out) drives investment. This creates a cascading effect that further drives altcoin prices to extraordinary levels for a limited time.
 

What causes an altseason?

Bitcoin tends to stabilize after a rally and move sideways for a while. This forces investors to seek more profitable opportunities. They often swap their BTC for other promising alts, decreasing Bitcoin's share of the total crypto market and triggering an altseason.
 

When does altcoin season start in August 2026?

The total crypto market cap currently sits around $2.5–2.7 trillion. Bitcoin dominance remains elevated near 58–60% (with some readings as high as 59.9%). It's still well above the key 55% level that many analysts have flagged as a prerequisite for meaningful capital rotation.

Bitcoin is trading in the $77,000–$78,000 range after its strongest weekly performance since March 2023 (approximately +24% from the prior Monday).

The latest surge was driven primarily by U.S. Treasury Secretary Scott Bessent's expansion of long-end bond buybacks (raising the size to at least $4 billion per operation, with signals it could go higher). The move eased yields, improved risk appetite, and triggered a large short squeeze across crypto markets.

The picture is more constructive than earlier in the summer, but rotation has not been confirmed. A sustained break and hold below 55% BTC dominance is still needed to confirm a broad altcoin rotation. It has now been well over 260 days since the last confirmed altcoin season.

History of past altcoin seasons

Previous altseasons have significantly increased the values of various altcoins, with some achieving exponential rises in relatively short timeframes. Noteworthy alt seasons include 2017–2018 and 2020–2021.

• 2017–2018: This altseason was driven by a substantial reduction in Bitcoin's market dominance, which fell from 86.3% in late 2017 to 38.69% at the beginning of 2018. During this time, Bitcoin's price fell from a then-record high above $20,000 to below $6,000 within a few months.
   
• 2020–2021: The altseason of 2020–2021 emerged during the coronavirus pandemic, prompting retail investors and crypto enthusiasts to seek opportunities beyond Bitcoin. This led to the emergence of the meme coin era, with Dogecoin and Shiba Inu achieving unprecedented growth.
  
  NFTs also boosted alt markets, enhancing overall sentiment across dApp sectors. During this period, BTC's market dominance dropped from 70% to 38%, and the altcoin season index hit 98 on April 16, 2021.
   
• 2024–2025: This period featured several strong phases of altcoin outperformance, though it never fully matched the classic, broad-based altseasons of 2017 or 2021 in duration or uniformity. After Bitcoin’s spot ETF approvals in early 2024 and the April 2024 halving, capital began rotating into higher-beta assets. Ethereum, Solana, and a wide range of Layer-1 and Layer-2 tokens saw significant gains. 
  
  The Solana ecosystem in particular stood out, with its memecoin boom (driven by platforms like pump.fun) producing some of the most explosive moves of the cycle. Tokens such as WIF, BONK, and later celebrity and AI-themed memes delivered parabolic runs.
   

How to tell when altseason has started

Recognizing the start of an altseason requires a solid grasp of market cycles and trends, or you could just check the altcoin season index. The problem is that the index is reactionary: by the time it shows we're in an altseason, it'll be too late to enter at good prices. Here are some key indicators to watch for.

Increase in altcoin dominance

A major sign of an altseason is a clear rise in altcoin dominance in the total cryptocurrency market. Alt dominance is the combined market cap of all cryptocurrencies other than Bitcoin, expressed as a percentage of the crypto sector's total market cap. Analysts have identified a confirmed break below 55% BTC dominance as the key inflection threshold for the current cycle.
 

Rising trading volumes 

A spike in trading volume across various alts is a notable indicator that the altcoin cycle is beginning. Increased trading volumes reflect heightened activity and growing investor interest, leading to enhanced liquidity and price movements.
 

When is the next altseason?

Closer than it was earlier in 2026, but not yet here. The Altcoin Season Index currently sits in the low-to-mid 30s (readings of 33–37 have been reported), firmly in Bitcoin season territory. BTC dominance remains elevated, and while selective altcoins have participated in the recent rally, broad outperformance has not materialized.

The structural sequence (Bitcoin rallies, dominance stalls, ETH/BTC turns higher, capital rotates outward) is progressing in its early stages but has not yet been completed.
 

One factor that could shift the setup is that regulatory clarity is improving. Progress on the CLARITY Act in the U.S. (with a potential Senate floor vote in mid-September) provides more certainty around token classification and could reduce a longstanding overhang on altcoin valuations. That clarity could be a meaningful catalyst for specific projects even ahead of a broad altseason. The recent Treasury buybacks have also improved liquidity conditions, which historically helps risk assets more broadly.

How to take advantage of the altcoin season

It's important to identify potentially lucrative opportunities before an altseason starts. Here are some key points to consider.

Research and diversify your portfolio 

Take the time to analyze and identify the best alts to buy. Sectors like RWA tokenization, next-generation DeFi, and AI infrastructure are attracting the most concentrated capital inflows in 2026, making them worth researching as part of any altcoin strategy. Diversification across sectors can mitigate risk and enhance potential returns.
 

Time your entries and exits 

Consider using technical analysis tools like support and resistance levels and the RSI to determine optimal entry and exit points. These can serve as effective indicators during altcoin seasons, helping you track price trends and market sentiment before you decide to invest. Missing the exit often matters more than missing the entry; altseasons end faster than they begin.

Key takeaways

An altcoin is any cryptocurrency other than Bitcoin. It is more volatile than Bitcoin and presents high-risk, high-reward scenarios.

• When Bitcoin's dominance drops sharply, it stimulates investments in alts, leading to an altseason.
   
• Forecasting an altseason isn't an exact science, and it isn't formally announced on a specific date or time.
   
• Altseasons can occur multiple times within a year and are often condensed into a relatively short timeframe. Prices of alts can fall as fast as they rise.
   
• In 2026, the altcoin landscape will have over 10 million tokens competing for capital (a fundamentally different environment from 2017 or 2021), meaning the dynamics of past broad altseasons may not repeat in the same form.
   

Crypto cycles often lead to more hacking and phishing attempts, making it crucial to protect your assets. Cold wallets like Tangem are among the safest ways to store cryptocurrencies, especially during periods of high market volatility.