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Hi all, 1st year with bonsai. Although I have a very knowledgeable friend advising me I’m a little concerned seeing the frost last night. I did put all my bonsai in the garage but I’ve read today you shouldn’t do that as it could confuse the tree.
I’ve also seen some photos of bonsai all shapes and sizes covered in frost.

I’ve got 10 recently but unshared Larches in plastic training pots and a few purchased bonsai inc Ilex, white spruce, conifer.
I’ve wrapped the pots in bubbles wrap and most of the surfaces are covered with moss.

So should I leave these out?

You can definitely leave the larches outdoors. Here it is -10 in the night and -5 in the day at the moment. I don't worry about the larch before it is constant below -20 for weeks. If you get your first frost by no, I am sure they are safe.

In order to make any recommendations for the other ones we need to know how cold it gets at your place in winter.

I cannot see any reason for putting bubble wrap around the pots. It does not harm, but do not have any benefits.

That’s good to know, I don’t think I’ve witnessed lower than -10 in the UK before but typically less than that.
I’d read somewhere that with smaller pots ( especially plastic ones) there’s a risk of roots freezing which was my mindset when wrapping the base of the pots in bubble wrap.

In UK you should keep these species outdoors at all times. Depending on what soil they are in they may benefit from rain protection.

All my hardy trees have frozen roots right now and they will be frozen all the way until at least march. Bubble wrap will not stop that.

the trees have nothing to fear, it's no longer the pots if they burn and terracotta, it could be shattered by the frost

Larch and white spruce are supposed to be hardy to USDA zone 2. Unless you live in Alaska or northern Scandinavia I think they should be completely fine outside, also when the roots are frozen solid.

I have read that fast drops in temperature may do harm, so maybe the bubble wrap would help a little. Larches don't think -10 is cold.

Bubblet wrap can insulate but not warm. If there are no heat source under the bubble wrap it makes very little difference.

Placing them somewhere with overhead protection might also help. Beneath a patio or an tree (evergreen tree)
Prevents cold radiation.