Greenhouses and tomato/courgettwa/peppers etc when can you plant out into the greenhouse and what about the frost?

[tiredandwornoutmum]

Will tomatoes etc survive a frost in a greenhouse, in a grobag????

The short answer is no, they won't. The long answer is, they will, if the greenhouse is heated on cold nights (and days). If you don't have heating in the greenhouse, perhaps consider a paraffin heater - cheap and effective, but go online to find out how to use them efficiently (kitchengardenforum is a good site)