Here in Texas it is never really safe to start the garden and planting until after April 20th. Of course most of the time everyone gets spring fever and starts early. Even me on a few occasions and ended up loosing plants to a late freeze.
One of the true signs for me that is OK to plant is the Mesquite trees-once they put on buds it's safe to plant. What signs do you use in your part of the world?
This simple box has been turned into a basket with covered seed packets. I also found a set of plant stakes at the home improvement store and made some matching plant id stakes. (I don't think they are weather proof but sure cute)