Ethereum has recorded six positive Octobers against four losses since 2016, delivering an average monthly return of 3.29% and a median return of 0.36%. Historical data shows significant volatility, with the largest October gain reaching 42.92% in 2021 and the steepest decline hitting 16.83% in 2016. The cryptocurrency enters October 2026 following a strong September performance, posting an 8.77% return. This marks the second-highest September return on record for Ethereum, trailing only the 14.53% gain achieved in September 2016.