May Bouldering

is May a good time to come to Denver? I'd love to do some bouldering with a few good people

Not a bad time to come but alpine bouldering is going to have to shoveled out more than likely.
Newlin creek is in season and lower alpine of RMNP, bear lake road, wild basin, moraine park, that kinda thing is what i would recommend. And if its to cold for sub alpine there is always stuff in the Front Range to occupy your time: Flagstaff, Flatirons, clear creek, Eldo, and stuff in evergreen. Hope that helps.