This is just my experience but I'd wait. When something potentially painful happens I think it is best to not have it happen when there are seasonal reminders. My nom-bio dad died just before Chriastmas and Christmas always will have a little tinge of additional sadness that wouldn't be there if he's died in March.

I hope that when you reach out it will be positive but overall it may be highly emotional either direction and with something you may want to forget a less memorable time. (On the other hand everything could go perfectly and you'd have a happy memory. But I don't think many things in life go perfectly). I hope this doesn't come across as negative.