Begin the division in early spring, after the final thaw of winter. Choose a sucker or side shoot to separate from the parent plant.
Press a spade into the ground just a few inches from the main stem of the sucker. Dig up just enough root and attached dirt to separate the sucker from the parent raspberry plant.
Cut any runners extending from the raspberry sucker to other plants using a pair of pruning shears. Remove one-third of the foliage from the sucker using the pruning shears.
Transplant the raspberry plant in a new location that receives plenty of sunlight. Maintain moist soil with daily waterings using a garden hose during the first growing season after the transplant.
Feed the transplant a 10-10-10 fertilizer following label instructions. Discontinue feedings in early fall to prepare the raspberry transplant for the winter frost.