I haven't personally had to do this but here are some tips (they may or may not be helpful)
- Make sure you buns are fully vaccinated and has had worming treatments, many diseases are caught outside and can be fatal, call your vet just to check if your buns have had all necessary vaccines and shots
-If your buns are going to transition, slowly give them more and more outdoor time so they can adjust with being outside more than usual
-Try to make sure you have the necessary items to protect your bun from predators like bears or other things (depending on where you are moving)
-Make sure your bun still has indoor 'play' time, that way you and your buns can still interact, choose a time that is suitable for you and your buns
-Try to place the hutch or enclosure in a shady area if possible, this can prevent the buns getting to hot
-Try to make sure if you are attaching a run or a pen that you have a roof over it so that eagles, birds or other predators can't access the buns
-Maybe even place a sheet over their enclosure to prevent them from seeing predators, as rabbits can sometimes even die of shock from just seeing the predator...
-Make sure the area your buns are going to be in a safe area, which includes shade (as mentioned before) and no unsafe or poisonous plants nearby that your bun can chew on (there is a very long list on this website if you'd like to check out-
Pet Safe Plants. Plants generally considered nontoxic for pets)
-Try to place your buns area on a patio area (or at least not on grass) some rabbits enjoy digging and could potentially escape
-Make sure that when you move your bun has plenty of water, and try to replace it more often as flies and other insects can get inside their water dish, (if you don't use a water dish try to change over to one as it is easier for buns to drink from)
-Make sure that if your bun has access to grass that it has no pesticides or any treatments that can be harmful
-If your bunnies are going from being free roamed in your bedroom to being in an outdoor enclosure make sure it is big enough for them and that they have plenty of toys and enrichment to keep them busy
-I'm pretty sure that CA can get quite hot in the summer (especially because of global warming!) so make sure your buns are protected from the heat, there is a video below that could help
-And finally if you are planning to have play time with your buns outside (obviously supervised) and you have some nice gardening that you don't want ruined by them section that area off with an x-pen or something similar
Sorry this is so long, let me know of i can help any more!
101 rabbits-