The hardy zones for Green Carpet are 5-10, so frost is not an issue.
Hail can damage nearly any leafy plant, but I don't think it should be a problem in harming or killing off this ground cover.
It is an easy-care perennial that is an excellent choice for growing between flagstones or growing as a lawn substitute. Deep green foliage creates a dense evergreen carpet, becoming bronze in winter. Tolerates high foot traffic. Well-suited for use as edging, ground cover or in containers.