SlackOutage history and postmortems
Downtime, added up
Slack: 10h 39m weighted downtime in range, category median 32m.
7 incidents, 7d 19h of incident time (0m major or critical, 7d 19h partial) between Jun 27, 2026 and Sep 24, 2026.
Stated causes
31 incidents with no cause stated.
Postmortems
- Overloaded AWS Transit Gateway takes Slack down on the first workday of 2021
Managed network components have scaling limits too; pre-warm for known traffic spikes and make sure provisioning survives the incident it is meant to fix.
Slack incidents
38 on file
Questions
Is Slack down right now?
Check Slack's own status page at https://slack-status.com for the live state. This page shows Slack's incident history from that page; the most recent incident started 2026-09-12: "Some customers experiencing blurry image previews and download issues".
How often does Slack have outages?
Slack posted 7 incidents in the last 90 days and 37 in the last year, 0 of them major or critical in the last 90 days. The median incident lasted 2h 40m.
When was Slack's last major outage?
2021-01-04: "Overloaded AWS Transit Gateway takes Slack down on the first workday of 2021", lasting 2h 18m.
What usually causes Slack incidents?
Where Slack explained the cause, the most common was deployment or rollout (3 incidents). Most status updates do not name a cause.
From vendors' own status pages and disclosures. Times as reported. Logos via logo.dev; trademarks belong to their owners.