I too am a fall spinach planter, actually by accident. Plant seed around mid Nov here and it gets through the toughest of winters (single digits) without any protection. Picking it for dinners going on 2 weeks now, can't beat it for "earliness" and it doesn't "bolt" until like spring planted until it gets hot outside which is early June here. Fall sowing extends the harvest by at least 4-6 weeks or longer. But for spring seed planting do as Marymd says, the sooner the better.

I started my spinach indoors about a month ago. The seedlings have about 4 true leaves now. I'm planting it out this weekend along with potatoes, onions, and leeks.

In your zone, sow now outside ASAP.

Thanks. I remember this worked for me before. Kind of. Seeds planted in fall popped up in spring. However plants did not get very big and bolted before I got much harvest - likely because of age.

Planting indoors is something I did this year. I got great germination. I definitely recommend starting indoors.

I transplanted out when they had one to two sets of true leaves. The down side is that even though they survive and tolerate very cool whether, not dying or wilting, however they don't grow much below 60 degrees.

Once it gets above 60 though, they'll grow very rapidly.