I've been wondering recently. As a nord you have 50% resistance to frost, and also as a vampire. Wouldn't being a vampire lord as a nord make you 100% resistant to any frost attacks? I would like to know because it would be pretty handy for my next playthrough...

No, the max resistance percentage is 83%. So your answer is no.

So even combinig it with frost resistance armour won't get me over 83%?

It wont go higher without modding the Game Setting fPlayerMaxResistance to 100 in the CK.

85%, actually. But no, you can't gain immunity.

Oh ok, full immunity would have been pretty awesome though Thanks for the help guys!

You can try getting some magic resistance to further protect your character from frost. It's applied after elemental resistance - or before? I never remember. In any case, magic res is applied to the remaining 15% of frost damage, so theoretically the final received damage can go as low as 2.25% (if both frost and magic resistance are maxed out).

Dragon's fire/ice attacks don't count as magic though, do they?

I believe they do.

Yes, add some gear that give magic resistance. I did that with fire resist gear, and I already have perks and innate magic resistance with my Breton. Works well!