When you see your hosta breaking ground is the perfect time to divide your plants.
how to dig out hosta
Use a pitchfork. Just push it into the soil and find the edge of the rootball. Work your pitchfork around the hosta loosening the rootball as you go.
Once you have loosened the hosta lift it out. It should be in one big clump.
Use a garden knife or a even a chef's knife and cut right through the root ball. Most hosta can be divided between 2-6 plants depending how large the parent plant is!