I'd say you're RIGHT on the cusp of it being "just in time," based on this information. I'm right on the edge of 5b and 6 depending on which zone map you look at, and if it were ME (not sure how exp your seeds were), I'd get them out post-haste, knowing that you might get "enough" cold to do them, but you could also do them in the fridge, too, and be certain they get the full 60d of cold.

Our temps here are starting to change already; we're headed for a tropical heatwave this weekend in the 40s (not to last, but still, indicative of impending change).

Good luck!

Thank you for the reply,

I changed my search criteria after reading your reply, with the link that you provided, and found out that Fireweed seeds need bright sunlight to germinate along with the cold. I assume that the seeds would naturally be covered up with snow so I don't think that they would need the sunlight until the very end. I don't know if this is a good assumption or not.

I also discovered that these seeds should be planted in "mineral soil" which (I guess) has little organic matter. I'm not sure where I'm going to come up with that.

Thank you again!
Tim