I would love to know how cold hardy they can be. I live in California. The climate is perfect in Los Angeles area. I live more up in the desert. It get HOT in the summer and fall. Winter is brutal cold for a desert. Right now it 37 F degrees outside.
We live in southern California in the "Inland Empire" and EFs are definitely suited to our weather. They are small, skittish, tough, beautiful birds that love to free range. Honestly, though, I would never get them again. We live in the suburbs and imho these birds don't bear confinement well and love to roam all over the neighborhood. One of our neighbors has two very noisy outdoor dogs, yet one of the EFs thought it would be a good idea to jump into their yard. Unfortunately, she was killed. If your neighbors don't mind finding chickens in their yards all the time and don't mind the earsplitting pterodactyl sounds these birds make, then I say go for it! They have tons of personality and are really pretty, but are very independent, noisy (like nothing heard since the Jurassic Era), and flighty. Let us know if you end up getting some!