I am temporarily moving a site to a new domain. Which redirect is best?

[Matt312]

A client is having their site redeveloped on a new platform in sections and are moving the sections that are on the new platform to a temporary subdomain until the entire site is migrated. This is happening over the course of 2-3 months. During this time, is it best for the site to use 302 temporary redirects during this time (URL path not changing), or is it best to 301 to the temp. domain, then 301 back to the original once the new platform is completely migrated? Thanks!

[effectdigital]

If it's 2-3 months the 302s might decay. Personally, I'd probably 301 and then 301 again (especially if it's nearer the full 12 weeks / 3 months). Wait to see what others say though