You can transplant at any temperature if the roots are not broken.There will be no problem if you have a good root ball and the soil not to heavy.

I dont think your palm will have a problem being repotted as long as it can tolerate those type of temps. I wouldnt expect any active growth though, so It will probably not be very likely to grow into its new pot until spring.

Why not just wait until spring?
It will be easier to keep it on the dry side through winter in a smaller pot and as mentioned it's not going to do much until spring anyway.
I have had much better luck transplanting things (that are outside)when the weathers warm.

thanks everyone! makes sense 2 wait till spring. but i forgot 2 mention that the roots grew alittle into the ground thats kind of the reason i wanted 2 transplant it & that i want 2 give it as much room 2 grow as possible. but if i cut the roots that grew out of the pot do u think i will damage the palm or worse KILL IT! just in case i need to bring it in on a cold day or should i just leave it out all winter? i think the lowest temp. we should get is 20*f worse being 15*F. but i doubt it.this palm was said 2 survive 12*F or so. ive cut the roots off washies before & they do fine but i have little experience with sabals. this is actually my 1st year with sabals. darn things grow slow! lol!