Ethereum's key dates mark the inflection points that shaped its evolution: launches, upgrades, regulatory events and cycle tops/bottoms.
Jul 30, 2015Ethereum network launches (Frontier).
Jun 17, 2016The DAO hack: 3.6M ETH (~$50M) stolen.
Jan 13, 2018Cycle-1 top: $1,432.
Dec 15, 2018Cycle-1 bottom: $83 (−94%).
Aug 5, 2021EIP-1559 (London upgrade): introduces per-transaction burn.
Nov 10, 2021Cycle-2 top: $4,892.
Sep 15, 2022The Merge: ETH switches from PoW to PoS, cutting issuance by 90%.
Nov 21, 2022Post-FTX bottom: $1,075.
Apr 12, 2023Shanghai upgrade: enables withdrawals of staked ETH.
Mar 13, 2024Dencun upgrade: cuts L2 costs by ~90% (proto-danksharding).
Jul 23, 2024SEC approves spot ETH ETFs in the US.
Mar 5, 2025Pectra upgrade: EIP-7702 smart accounts + validator improvements.
Aug 24, 2025Cycle-4 historic ATH: $4,953.
Jul-Oct 2026Projected cycle-4 bottom window ($1,900-$2,300).