Since my soil is quite heavy in clay, the problem I have with planting when the soil is wet: The soil wants to clump together and you can't get any fines to cover the roots or seed. I did put on my boots and go push some onion sets into the mud the first weekend in April. That planting turned out good, they are up and looking good. I usually wait for drier conditions to plant.
Gardening at 5000 feet elevation, zone 4/5 Northern Utah, Frost free from May 25 to September 8 +/-