:Salesforce CRM Winter '26 Release (Including Sandbox Preview): Key Dates and Actions

Date

Milestone

Description

Actions

August 21, 2025

Annoucement day

Winter '26 Release (Including Sandbox Preview) Announcement

• Confirm whether your sandbox org is running on a preview instance or a non-preview instance.

• Review the definition of cutoff date and determine if your sandbox org requires participation. 

September 23, 2025

Cutoff day

Deadline to Apply for Winter '26 Sandbox Preview

Ensure sandbox orgs needing the preview are running on a preview instance before the deadline. 

September 25, 2025

Preview start day

Winter '26 Sandbox Preview Begins

Prepare for the Winter '26 official release by testing and validating it in your sandbox org. 

November 1, 2025

Release day

Winter '26 Official Release

Verify that your business processes function as expected after the production org upgrade.