According to Crypto Rover, altcoin season is breaking out as of May 12, 2025, with multiple altcoins showing strong upward momentum and outperforming Bitcoin in short-term returns (source: Crypto Rover, Twitter). Traders are witnessing increased trading volume and volatility across major altcoins, signaling potential for rapid price appreciation and lucrative swing trading setups. Monitoring sector rotation and tracking leading altcoins with high on-chain activity remains critical for capturing gains during this breakout phase.