Kath has you on the right track. Soil temp at planting depth (1 to 2") is the best indicator. Your soil moisture profile really decides the depth you need. Heavier soils are cooler and wetter so you would plant shallower while light soils will be warmer and drier so you would plant deeper. I prefer one and one-half inch depth myself.
When you see the temp getting to 50 degress with good moisture at your chosen depth you should be good to go.
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George
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"The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants. It is it’s natural manure."
Thomas Jefferson, 1787
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