I'm in zone 5b
Depends on how cold you wintered them.
Mine are mostly outside, they won't wake up until it is ''safe''.
My subtropicals and trees from zones 6, 7 and warmer are wintered in an unheated well house. Typically, even in an arctic polar vortex with record breaking cold, it never gets more than a degree or two below freezing. Unfortunately as the ground thaws it will get warmer than 40 F or 4 C about two weeks before the last frost. Japanese maples and other more tender trees will start growing early.
You can put things out for warm days, then bring them in when frost threatens. THis is the ''In again, out again dance".
Or you can be stubborn like me, I leave everything in storage and take them out after the maples in my landscape, sugar maples, red maples and norway maples open leaves more than half way. This is usually after the street tree maples have flowered, as most maples flower before the leaves. Once the leave are about half way open, you are not likely to have a significant frost. Once I switched to environmental cues, rather than a calendar date, I had no trouble with late freezes forcing me to move a bunch of trees at dusk, for fear of frost.
