You didn't mention what seeds....but a lot of tender annuals will reseed themselves in our cold climate of Maine...as you probably already know. I have left tomato plants in the garden over winter and to find they reseeded from the fruit. I hope that gave you some hope..

Most seeds can be stored in the freezer with no ill effect. Don't worry.

I just read the back of a package of new nasturtium seeds and it says that the seeds won't survive freezing. Too bad I have frozen ALL my left-over seeds over the years. Some do okay but the nasties didn't do much at all.