i dont know if your palms will be okay. im in zone 9b/10a and i have dozens of both of the palms you mentioned growing like weeds all over my front and back yard. this january we had a severe freeze with temperatures dipping into the low and mid twenties for one whole week. the canary island date palms that i had transplanted to a desireable location in the fall died and so did the washingtonia robusta. the ones that i didnt transplant are begining to send out new growth. i would recommend you just leave them alone and see if they put out any new growth.

jd