While the late-winter dormant season is the best time to transplant roses--since the plants have no flowers then--gardeners can move their rose bush in August. Whether or not your rose bush has finished flowering by August, you will need to severely prune it before transplanting. This may mean the end of your rose display for the season, but the next growing season you can enjoy your roses in their new location.
Water your rose bush every day for one week before planting until the ground becomes saturated. This makes it easier to remove the plant from the ground.
Dig the hole for your new rose bush. This Old House's website suggests a hole that's 18 inches wide and 15 inches deep, and advises working organic matter like compose into the hole.
Prune your rose bush. This makes it easier to move. Remove dead canes, which are tan, and any canes that cross other canes. Trim back long canes to a bud. The more you prune, the less growth you will have to move so prune more, not less.
Tie your rose bush canes together with twine to make it easier to move the bush without damaging growth.
Dig the rose bush out of its current location. Work your shovel into the soil then lift up. As you dig down, you'll see the rose bush roots. You want to dig a hole around the roots so the roots come with you.
Lift the plant up out of its current location when you've freed most of the roots. With gentle tugging the rose bush should come with you. If a couple of roots remain in the ground, cut them loose with your pruners.
Carry the rose to its new location and place it in the prepared hole. Spread the roots out. Backfill the hole with soil.
Water the newly planted rose until the ground becomes saturated.