When to germinate seeds for outdoor Greenhouse grow?

Pretty new to growin so just wondering when can you start germinating seeds in preparation for putting them into greenhouse; normally I do this later but the warm winter in Europe means I think you can start earlier, any thoughts appreciated...

How tall is your greenhouse ? are you gonna germ your seeds in the greenhouse, inground or pots ? If you have height restriction you will want to start later.

Yes I will germinate indoors and put the small plants out, some in pots , some in ground. See what you mean about height,they are all feminised seeds but not auto's. Greenhouse is small 6x3 type standard height i think . One year I had a huge plant bursting through the roof and this almighty storm ripped the plastic panels out tryin to catch them and stick em back before neighbours saw this majestic plant swayin in the wind.

Height could be a problem, but I side-skirt that by using low stress training (LST) for my plants in increase my yields. I use this method: https://www.rollitup.org/blogs/blog24315-simple-how-lst-guide.html

From a 1 gallon pot inside I would only plan for like 4 weeks of vegg in the green house. So germ indoor a month before that point.

or you can start 2 months ahead and grow some monsters.