What plants have you got in the cold frame?

I would keep it closed and latched - to avoid 'squatters' and untoward visitors.

Bamboo, It's cuttings in there, mainly salvia.
Bathgate, that would be the easiest solution but I thought some air might be needed at times.

I tend to leave mine slightly open all through the winter just to allow air circulation. I don't think removing bubble wrap will increase air movement, it will just reduce the insulation.

Thankyou SBG. I think I'll do that then.

VERY
GOOD QUESTION.

Agree with Seaburngirl - but only very, very slightly open, I'd insert a flat piece of tile or something just on one outer corner of the top to prop it up slightly, in case we have a sudden freeze while you're away, although that's more likely in January rather than December.

I use lego bricks on the front edge. well they have to be useful for something now the girls are grown ;o)

Haha Thankyou all. My instincts were ok I think. Hope there isn't a freeze but if there is - well can't win em all.

Ianplant. do you have the same issue? I'm away tomorrow so today I have placed 3 pieces of wood under the lid. Still stable enough for a brick to stop it blowing away. It's a very flimsy coldframe.

Whats wrong with fleece ?