I'm planning to build a smallish shed (15' x 21') framed with hemlock timbers (mostly 6"x6") on 3' centers. I will mortise and tenon the timbers by hand.

The local mill will furnish the rough-sawn hemlock to me green, still dripping. My question is: is it better to cut and fit the hemlock timbers while they are still green and wet? Or is it better to sticker the timbers up, cover them, and let them air-dry for four to six months, and then cut and fit the timbers after drying?

Thanks for your advice/guidance.