Actually you should be extra diligent when shipping to Alaska. The temperature can be a concern, sure, but so can delivery times. There are any number of zip codes where overnight delivery is NOT offered, regardless of how you book it. Some areas have up to a week long delivery schedule.
Check out this link at the ShipYourReptiles FAQ for a list of affected Alaska zip codes, and then double check against the FedEx guidelines to be 100% confident in delivery times for your live package.
ShipYourReptiles.com FAQ- special note on shipping to Alaska and Hawaii