Answer: pampas grass is not hardy to zone 4 but you might try a look-alike substitute:
Erianthus ravennae (Saccharum ravennae). It's commonly called hardy pampas grass but it is not really a pampas grass, but part of the sugarcane family. Showy, 2 ft. long silvery white silky plumes have gorgeous autumn coloring. Foliage has a clumping habit. Full sun. Fast growing 8 to 10 ft. tall. Flowers reach above the blades. It is hardy in zone 4.
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