Never work your soil when it is wet.
Digging or tilling wet soil will turn it into clumps as hard as concrete. It will take several seasons of adding organic matter to the soil to rebuild its structure.
To check if your soil is dry enough to work, take a handful and squeeze it. If the soil crumbles through your fingers, you can work your soil. If it stays in a ball after squeezing, wait a few days.
