There are often visual indicators of when spring is arriving well before we feel a change in the temperature outside. Tree buds start to form, the days get noticably longer and for a gardener with edibles, rhubarb is often the first thing to pop up. Once the rhubarb and lovage start pushing through the soil, I know it is game on and time to get myself in order.
And then there are seeds that I have actually planted. I literally threw a small handful of arugula seeds into a pot about three weeks ago, and voila! They are growing.