Modern hybrid tea roses are crosses between different varieties of roses that are often grafted to a hardy rootstock. Many varieties are suitable for United States Department of Agriculture (USDA) hardiness zone 5b, where it can get as cold as -10 degrees F to -15 degrees F. With proper preparation and care, hybrid tea roses can do very well wintered over in place in hardiness zone 5b.
Prune all of your roses back to around 3 feet tall in November to prevent damage from the weight of the winter snows.
Remove all leaves and debris from the ground in the late autumn. This will reduce the risk of some diseases in the spring.
Mound soil 8 to 10 inches up the main rose stems once the night temperatures drop to 20 degrees F. Use soil from other parts of your garden or yard to avoid disturbing the roots of your roses.
Add 6 to 8 inches of mulch over the mounded soil and other soil areas around your rose bush. This will help keep the soil temperatures more stable over the winter and help keep sudden drops in air temperature from damaging the roots of your rose bushes.
Prune away any deadwood at the end of winter or early spring to help encourage new growth on your rose plants. Prune your bushes back to a height of 12 to 18 inches tall.
Prune the bushes down to 6 to 8 inches once the risk of hard frost has passed.