The Salesforce Winter ‘18 release is quickly approaching and soon you'll be able to take advantage of exciting new features and functionality! If you are a Sandbox customer, you have the opportunity to get early access to Winter ‘18 in your Sandbox and test new customizations and features before your production organization is upgraded.

The Sandbox Preview window for Winter ‘18 is scheduled to begin September 8, 2017. If you would like your Sandbox organization to take part in the Winter ‘18 Preview, your Sandbox must be active on a Preview Instance before September 8, 2017 to take part in an overall instance upgrade.

Please read carefully and follow the instructions in the next section for specific information on how to handle each of your Sandboxes.  In most cases, you will not need to do anything because your Sandbox is already on a preview instance.  But you may need to take action before September 8, 2017 in order for your Sandbox to take part in the Winter ‘18 Preview.

General Information about the Sandbox Service:

Sandbox Instances are split up in two groups – Preview and Non-Preview. Preview Instances are instances which get upgraded to the newer version of Salesforce before Production Instances (e.g. NA2, EU1, AP0) and Non-Preview Instances are upgraded towards the end of a Major Release along with the majority of Production Instances. For the Winter ’18 Release, the Preview Instances will be upgraded to Winter ’18 on September 8 and September 9, 2017 and Non-Preview Instances will be upgraded to Winter ’18 on October 13 and October 14, 2017.

Between now and September 8, 2017 all sandbox requests will be routed to Preview Instances. Sandboxes that complete in time for the major release on September 8, 2017 will be upgraded to the newer version of Salesforce.

On September 8, 2017, all incomplete sandbox requests will be reset on a Non-Preview Instance and pending and new sandbox requests will be routed to Non-Preview Instances until your Production Instance is upgraded to Winter ‘18.

You have from now until September 8, 2017 to decide if you would like your Sandbox to take part in the Winter ‘18 Preview. Follow the steps below for each Sandbox org that you have.

Note: If you have a full Sandbox, be mindful of the 29-day refresh policy and plan accordingly.


I need to create a new Sandbox – What are my options?

I have an existing Sandbox – What are my options?


1) Determine your Sandbox instance


To determine which instance your Sandbox is on, log into your production org and navigate to your Sandbox List page (Search “Sandbox” in the Quick Find bar on the Setup Home Page).

Determine your Sandbox instance by using the Location column above.


2) Refresh? Or Don’t Refresh? Or Do Nothing?


Once you have located the instance that your Sandbox is on, use the chart below to determine if, when, and what action you should take on your Sandbox.


  • If you decide to stay on the current Summer ‘17 release, your Sandbox will not be upgraded to Winter ‘18 until October 14, 2017.


AppExchange Preview Instructions


If you plan to upload and/or install one or more AppExchange packages using your Sandboxes during the Sandbox Preview Window, you should use the chart below to determine your course of action.


If you have additional questions about your Sandbox options in conjunction with the Winter ‘18 release, please contact Salesforce Customer Support.

IMPORTANT - Plan Ahead!

Due to the popularity of the Sandbox Preview program, there are often backlogs in Sandbox create and refresh requests. Since all incomplete sandboxes on September 8, 2017 will be reset to a Non-Preview Instance, it is a recommended practice to request your sandbox a week in advance of the deadline to improve your chances of obtaining a completed Sandbox on a Preview Instance. While we strive to process each request in a timely manner, we cannot guarantee completion of the Sandbox before the deadline.

Additional Information

Demystifying Sandbox Preview