I've never shipped or been asked to ship a growler. When shipping can, I've always shipped warm and never had a problem. Is it ok for a growler to get warm during shipping? I'll be shipping a stout in 750 snap tops, so I'm not overly concerned with leaking, more so about it getting warm.
http://www.beeradvocate.com/community/search/31603648/?q=growler&o=date&c[title_only]=1&c[node]=27 Otherwise, I think it will be ok. If you are really worried wait a month for things to cool off