Last year in September I planted Vital Green Spinach directly in 3 EBs.
I had no problem with them germinating in the EB. I harvested 2 boxes and the last box (poor thing) was left to overwinter, (not by design).
In mid February the spinach in Box 3 perked up and I harvested it in March.
So...February 15th I planted 2 more boxes--direct seed. Those 2 boxes put out great spinach until 5/24 when it was getting hot, so I pulled both boxes.
It may be too hot right now to start in NY, I know it is here.
I have never had good luck trying to start spinach for transplanting....but direct seeding seems to work well--at least with Vital Green
I am planning to put in 5 boxes this labor day...it was the best spinach we have ever had !!!