Q.Vigoro perennial grass plants
I live in NH – with harsh winters. I bought Vigor perennial grass plants and didn’t plant them in the ground before. Now, in late April, I see no signs of life in any of the plants. Do you think they’re dead, or wait a while, way too early to tell? Thanks!

I would give it some more time. Warm season grasses begin to grow much later in the spring as air and soil temperatures increase, so I wouldn't write off your perennial grass just yet!
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https://www.gardeningknowhow.com/ornamental/foliage/fountain-grass/tips-for-care-of-fountain-grass.htm