Solana Foundation Sets Alpenglow Mainnet Upgrade Date

1. #0108.22
   Initial2026-08-22 · edition date

   Solana Activates 350ms Slots on Mainnet, First Cut Since Genesis

   Source evidence: The Defiant

2. #0209.23
   Escalation2026-09-23 14:40 · publication time

   Solana moves Alpenglow into testnet as SOL nears January highs

   Solana began rolling its Alpenglow consensus upgrade onto testnet, the first public deployment of the TowerBFT replacement targeting roughly 150-millisecond finality while leaving the SVM, transactions, programs and fees unchanged.

   Source evidence: CryptoSlate

3. #0309.26
   Confirmation2026-09-26 05:00 · publication time

   Solana’s 150-millisecond settlement upgrade reaches second public test network

   Alpenglow is now running on both devnet and testnet; the devnet switch was announced Sept. 25, and the testnet transition completed the day before, with mainnet launch still unscheduled.

   State after update: Solana's Alpenglow consensus upgrade is running on both public test networks, devnet and testnet, for developer testing, with mainnet launch not yet scheduled.

   Source evidence: CoinDesk

4. #0409.26
   Confirmation2026-09-26 14:37 · publication time

   Solana’s Alpenglow Goes Live on Devnet Ahead of Mainnet Migration

   Anza's Alpenglow consensus upgrade for Solana is now live on devnet, with developers asked to test programs and integrations while mainnet activation remains pending.

   Source evidence: The Defiant

5. #0510.09
   Escalation2026-10-09 04:52 · publication time

   Solana Schedules Final Cut to 200-Millisecond Slots

   Solana is scheduling its final cut to 200-millisecond slots, compensating with smaller per-block compute limits while validators face more frequent voting and shorter block-production windows.

   Source evidence: The Defiant

6. #0610.09
   Escalation2026-10-09 05:00 · publication time

   Solana is about to halve its block times as final 200-millisecond upgrade nears

   Solana has progressed beyond the 350ms cut to 300ms and 250ms, and is scheduled to make a final reduction to 200ms target block time at epoch 1053, completing the SIMD-0525 sequence of cuts from 400ms.

   State after update: Solana mainnet has completed 350ms, 300ms, and 250ms slot reductions and is scheduled to activate 200ms target block time at epoch 1053, with the final mainnet rollout still dependent on network conditions.

   Source evidence: CoinDesk

7. #0710.10
   Escalation2026-10-10 00:40 · publication time

   Solana doubles block production speed to 200ms as network prepares for Alpenglow upgrade

   Solana activated 200-millisecond slots on mainnet on Oct. 9, completing the four-stage SIMD-0525 reduction from 400ms: block-production opportunities rose to five per second, epoch duration fell from about 48 hours to about 24 hours, and transaction blockhash expiry shrank from about 60 seconds to about 30 seconds.

   State after update: The 200-millisecond target of SIMD-0525 has been activated and declared complete by Anza; attention now shifts to the Alpenglow consensus overhaul targeting ~150ms finality, which has been deployed on testnet and devnet but has no announced mainnet activation date.

   Source evidence: CryptoSlate

8. #0810.13
   Escalation2026-10-13 15:14 · publication time

   【Solana 共识升级 Alpenglow 将于 10 月 21 日上线主网，最终确认时间降至约 150 毫秒】

   Anza announced that Alpenglow is scheduled to activate on Solana Mainnet-beta around Oct 21, 2026 at 22:50, with a single-slot migration; the mainnet activation was previously unscheduled.

   State after update: Alpenglow is live on devnet and testnet, and Anza has now scheduled Mainnet-beta activation for around Oct 21, 2026 at 22:50 with a single-slot migration. Mainnet activation is now scheduled but not yet executed.

   Source evidence: foresightnews · theblockbeats · wublockchainenglish

9. #0910.14
   Confirmation2026-10-14 04:11 · publication time

   Solana sets Oct. 21 for Alpenglow upgrade targeting 150-millisecond finality

   Solana has scheduled its Alpenglow consensus upgrade for Oct. 21, targeting roughly 150-millisecond transaction finality by replacing TowerBFT and moving validator votes off-chain, while requiring validators to migrate to Agave 4.3.0.

   Source evidence: CoinDesk

10. #1010.14
    Confirmation2026-10-14 19:16 · publication time

    Solana Sets a Date for Its Next Major Upgrade

    The Solana Foundation set October 21 (epoch 1064) for the Alpenglow mainnet activation, which replaces the TowerBFT consensus with a new system targeting roughly 150ms transaction finality instead of the current ~12.8 seconds, and will remove vote transactions from blocks — sharply lowering headline TPS counts without any decline in real activity.

    Source evidence: Decrypt

11. #1110.15
    Confirmation2026-10-15 12:07 · publication time

    Morning Minute: Solana Is About To Get Faster

    Solana has scheduled Alpenglow's mainnet activation for October 21, retiring its original consensus mechanism and targeting finality of roughly 150 milliseconds versus today's ~12.8 seconds, amid a broader crypto selloff that saw majors drop 3-5% and over $900M in liquidations.

    Source evidence: Decrypt

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