To plant out or not to plant out?

in Plants
I have some healthy lychnis coronaria seedlings growing happily on my windowsill. I’m not sure whether to plant them out now, while the soil is still warm, or overwinter them in my cold frame. Any advice gratefully received!
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I've had a small one sitting in a 3 inch pot since last year. It's had no protection here at all.
I should have asked what stage they're at though - are they in individual pots?
I live in west central Scotland - not where that photo is...
Mine sat under a bench - I think it's still there, as I don't really have anywhere to put it.
I live in west central Scotland - not where that photo is...
I live in west central Scotland - not where that photo is...