Asclepias tuberosa

Hi,
I planted 3 bare root Asclepias tuberosa last fall and this is the first time growing this species.  I know that they are late to break dormancy but they have not appeared above ground yet.   I live in Western MA zone 5 and am wondering if they still have hope or perhaps they did not make it through winter, they are planted in sandy well drained soil .  Other late breaking plants such as hardy hibiscus and platycodon have made their appearance above ground already. Just how late is butterfly weed?
Thanks in advance for any info. 
Jerry
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