frost and brassicas

Brassicas are tolerant of frost.  I have lots of brassica seedlings in my unheated greenhouse and they look fine. Make sure they have some ventilation as they can cope with cold but not cold and damp

I've found with brassicas that they might look frosted but they seem to bounce back. 

It's never a good idea to sow the whole packet of seeds. Always sow some and keep some in reserve for repeat sowings, in case of failures.

Thanks compost queen they do look a little frosted but so long as they'll be ok. Plenty more seeds left though