Quote Originally Posted by redeyed
How early can I start my plants from seed do you think, I'm in southern New England if that helps.
.
LOL the same time I start mine, here in Southern New England!!!
I think the rule is that a greenhouse gives you an extra month of growing season for other hot weather crops like maters. So if you want to be 'planting out' normally on May 1st (frost-free date), you'd instead put the plants in the greenhouse in early April.
What I plan to do with the tomatoes is start them under lights and have a high/low thermometer in the greenhouse to see whn I have a solid week of night temps above freezing, and then put them out.
I think starting seeds in mid to late February will give you plenty of time to get them off to a good start.
One thing I've read is that a heat mat under the pots can give you a lot of wiggle room in terms of low temps. Warm roots=more tolerance for cold.
One last thing to keep in minds is that cold conditions make the plant more susceptible to stress from low pH. So make sure your soil is PERFECT... lots of nice leaf humus.

Where are you actually? I'm on the I-91 corridor in WMass. Howdy neighbor!