When are you planning to start your fall plants? I wouldn't think you could wait too late--slowed production for fall tomatoes is both temperature and sunlight. The intensity of the sun is reduced both in total hours and angle, so stuff just grows slower even if the temperature is reasonable.
In Iowa you would want to go with short season, cold season tomatoes such as Kimberly, Stupice, Gregori's Altai, Bloody Buthcer, many Russian or Siberian types (see Tania's and Andrey's posts), or a dwarf. I would start these in pots in mid summer and drag them into the greenhouse when the temps started dropping. That way they would have put on most of their growth and set fruits in the warmer, sunnier part of the season and you could let them finish off in the greenhouse.
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--Ruth
Some say the glass half-full. Others say the glass is half-empty. To an engineer, it’s twice as big as it needs to be.
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