Your bed looks awesome!
I'm guessing if you had snow on Mothers Day then you still have time to get the garden out. This spring has been an odd one as this is the first time I remember ever having snow in may here. My tomato and pepper plants were constantly in and out of the house because of the weather.
I would definitely add some compost and aged horse manure too. I do know there is chemical that's sometimes used on
hay that can linger in the composted poo and have some detrimental effects on crops though. Also mulch is your friend and will help conserve
water while providing organic matter.