The Altcoin Season Index has climbed to 56 out of 100, its highest level in months, but remains below the 75-point threshold required to classify the market as an altcoin season. The index measures how many of the top 100 cryptocurrencies have outperformed Bitcoin over the past 90 days: 75 or more indicates altcoin season, 25 or fewer indicates Bitcoin Season, and readings between those levels are neutral. Stablecoins such as Tether and asset-backed tokens such as wrapped Bitcoin and staked Ether are excluded because their prices follow different mechanisms. CoinMarketCap and Blockchaincenter use slightly different universes, with Blockchaincenter tracking the top 50 rather than the top 100, so their readings can differ. Recent performance favors altcoins. XRP rose 6.59% to $1.5540 and Solana gained 4.42% to $118.20, compared with Bitcoin's 1.58% advance to $84,558.90. Ethereum rose 2.35% to $2,703.80 and BNB gained 1.33% to $776.44. The CoinMarketCap 20 Index added 2.16% to $177.97. Over the past week, NEAR Protocol gained about 92%, while Arbitrum, Uniswap, Ethena and Zcash each posted gains above 40% over comparable periods. Blockchaincenter's record shows the market moved from Bitcoin Season to Neutral on Sept. 2 and remained there for three weeks. The index's 90-day design makes it deliberately slow: it requires sustained outperformance and can lag a shorter rotation in altcoins. Bitcoin also rose about 12% over the past week and recovered the $82,225 average cost basis of U.S. spot ETF holders, making the 75% outperformance threshold harder to reach. Bitcoin dominance fell from 59.25% at the end of August toward the high-58% range, consistent with rotation but not a decisive break. The data therefore point to a broadening rotation rather than a confirmed altcoin season. The article is informational only and is not investment advice; crypto assets are extremely volatile, and investors can lose their entire investment.