Salesforce Summer '26 Release Dates and Sandbox Preview Schedule

Salesforce Summer '26 release: critical dates for technical teams

Summer '26 gives developers, architects and admins a fixed deadline to work back from. Two dates drive the plan: the day production picks up the release, and the day your sandboxes get it so you can validate integrations and customizations against it.

Production instance upgrade schedule

Your instance name decides the exact date production receives Summer '26 features. Critical business logic, Apex classes, integrations and Flow deployments all have to be tested before that date.

The general main release weekends for Summer '26 are:

• Weekend 1: May 9, 2026
• Weekend 2: June 5, 2026
• Weekend 3: June 12, 2026

For your own production upgrade date, go to the Salesforce Trust site and look up your instance name or domain in the maintenance schedule for the Summer '26 release event.

If you are not sure which instance you sit on, Setup under Company Information tells you.

Sandbox preview and pre-release strategy

Release management stands or falls on sandbox testing. Salesforce usually offers sandboxes two upgrade paths, Preview and Non-Preview.

• Sandbox preview window: most sandboxes are targeted for upgrade around May 9, 2026. That window is where regression testing against your deployed customizations happens.
• Non-preview sandboxes: these usually get the release later, which lets you stagger testing or validation runs.

Get into the Summer '26 Pre-Release Org as soon as it opens. A pre-release org is a developer preview environment: all the new features, none of your configuration or data. You can evaluate features and start adapting code there without touching the stability of your existing sandboxes.

Accessing release notes

The Salesforce Release Notes are the technical documentation for feature changes, deprecations and behavior changes that land on Apex, the APIs and the platform underneath. Watch official Salesforce channels for the publication date of the finalized Summer '26 Release Notes, then read them before you update custom code and architectural designs.