Hi Babs, we can get frost any month of the year here, but usually I start watching the weather forcast anytime after the middle of August.  If I am on top of things and get out to the garden to cover up the plants that need it, then it's ok.  Most plants can stand a light frost. The days are still warm and sunny, so things keep growing.  We are far enough north here that we have very short but nice summers.  Lots of sunshine.  Sunsets at 11:00 pm and sunrise at 3:00 am or so during the summer....of couse in the winter we pay for it, we hardly see the sun!  I love our greenhouse, it is family run and only a few miles from me.  I would rather support local business and have someone who can answer my questions and is interested in helping me grow a successful garden!  I've been trying to get DH to build me a greenhouse, I had one when we lived in town and loved it.  It was 10 ft x 12 ft, big enough for some tomato plants and peppers. The people we sold our house to in town tore it down, wish I would have known they were going to do that, I would have found some way to take it apart and bring it with me.