I too am growing sugar snap peas for the first time. I don't think I have ever eaten them garden fresh, so I am looking forward to it. I also intend to plant a few more in autumn - hopefully enough to freeze some. How long will they keep in the freezer in the freezer bags? They are supposed to be cold hardy, but they seem to be growing a bit slowly to me. Will they get a growth spurt after a certain size? How do you know when to harvest, and when the vines are done for the season? I think this is one of the plants I will have to plant the winter crop in containers closer to the house so I can keep them covered and maybe grow them into November and December. Growing in containers will allow time to add fertilizer, fresh garden soil, and manure to the soil where a few vines are now growing. Then that area will be ready to plant again next February.
I put straw around them to help keep their roots warm. It hasn't been very cold, but I recall the seed packet said they have shallow roots. As you can see in this photo, the neighbor has a lot of weeds on his side of the fence, which I hope the straw will keep out a bit. (Which is a bit of a bummer because I would have liked to grow some in hanging pots, so the peas hang down, but didn't think the shallow roots would support the vines.)