Planning and Design: last frost?

After a freak SNOW! last week the weather seems to be settling into spring finally! Today I confirmed measurements and updated the garden plan, transplanted a few items from the nursery strip and dug the blueberry bushes into their new home. I am still trying to get beds layed out for planting and now feel the panic that the (hopefully) last frost has passed!

In the PNW the last hard frost is generally towards mid-April.