Is it too in arrears contained by PA to plant flowers approaching sunflowers and rhodadendrins? and pumpkins?
Answers: No, no, and no.
Actually, planting pumpkins EARLIER than this would have be too soon. Rhodos can be planted anytime...although the closer to summer you get, the trickier it may be to attain them established. Hot weather means the watering could be an issue if you forget. They resembling a slow, deep drink, something like once a week in thaw out weather, once every 2 weeks in cool weather for the first growing season. Once established - they should one and only need assistance in a drought.
No, very soon would be a good time