Since I learned that my seedlings grow much better with a bit of fertilizer applied after potting up I can get away with six weeks before last frost date. It doesn't matter if they stay in the pots for an extra week or two while I fiddle around getting the dirt ready between last frost date and actual planting so the seed gets started between April 1 and 15, and the plants go in the ground between May 20 and June 1.
It gets warm enough a month or two before last frost to put plants out during the day so I think I'll start some early varieties for containers in February. They should be small enough to fit in the windowsills until they can go out during the day.
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