Hi Karen and welcome to gardening! The photo helps out a lot but my answer is still - I don't know for sure. In most cases I would say the roots most likely survived so just cut back the plants in mid spring and new growth will appear. However in your case these were not established plants so they may indeed be dead. The only way to tell is to wait. By June if you see no new growth from the base of the shrubs then out they go. A hardier shrub may be the answer in your area. Conifers such as cedar and fir are more cold tolerant than evergreens with broad leaves like laurels. We all learn from our gardening mishaps so don't be discouraged and Keep Growing, Marianne Binetti