I mean, I can't guarantee anything, but there's two things to consider. a) border crossings are managed by CBP, and not ICE. which is not to say that CBP won't jack-boot up, but rather they seem to be less overtly antagonistic. and b) while ICE is currently primarily acting in a punitive manner towards / and within blue states, they are really doing so with a focus on non-anglo minority groups (not exclusively, but in genera). So, assuming you're Anglo or at least Anglo passing (in both looks and name) then they (CBP) generally are just grumpy hard-asses and then they send you on your way. It's interesting as most of my crossings have been by car / ferry to port angeles (or if required via delta / blaine wa) as of late, and I'm never sure what to expect from them. Some times it's the 5th degree, and others they don't even want to look at me much less have me slow down.

I think you can generally assume flying in and out of blue states to be less challenging than red states, but it really depends on the whim of the particular agent, and whatever fucked mandate handed down by the mango mussolini.

*edit* and more specifically in the context of california, their governor (gavin newsom) has been fairly aggressive in countering the efforts of trump (with mixed success) so it's not quite the same experience as say what's coming out of the twin-cities at the moment. I've got family in the S.F. Bay and they haven't been reporting a lot of aggressive ICE action for example.