Inside the greenhouse

I have started lots of flats of plants, but I fear it might be late this year. We've had a string of 70-degree days and 50+ nights - it seems like summer already - but our last frost date isn't until May 15th!

I think I probably could have gotten away with planting corn already.

I'll bet the extension office would tell me to go take the soil temperature. Haven't done that yet. The average temp. inside the greenhouse with the windows open is about 80 degrees during the day and goes down to 60 at night. I left the windows closed the first few days before putting plants in - went out mid-day and found the temperature was over 120 degrees!