Perennial seedlings - what now

Hi Everyone, I am a total newbie and need a bit of advice if possible.

I planted up some perennial seeds about 6 weeks ago and now have a few trays of seedlings. These are Monarda, Echinacea, Astrantia, Aquilegia, Geranium and Primula etc.

Do I need to get these under cover or do I just leave them out in the garden over the winter?

Thanks

Mike 

This is a tricky one I find Aquilegias, Primulas, Hardy Geraniums are fine just left in the garden but the Monardas and Echinaceas did not  survive. If you have a cold frame or a sheltered bit of patio they may benefit from that.

Thanks Kate1123 - I could put them under a car port which is open one end. Or would it be better to build a proper enclosed cold frame?

A proper cold frame will give them better protection and allow you to lift the lid and ventilate on warmer days plus add an extra blanket of newspaper or some such when very cold nights are forecast.   You can also line it with bubble wrap for extra insulation.