Should be, unless there's a frost - then throw a double layer of fleece over them.

ive just put my young plants in growhouse so hoping no more frost now, like barbara said will just through bubble wrap over then if weather changes.

same thing happened to me with some geraniums 2 weeks ago, I potted them into cells and then covered with bubble plastic at night but now only cover if frost is forecast, they are fine at the moment. I was very cross as they were a month early

They should be ok. If you havn`t got fleece or bubble wrap good old news paper works as well. Snake