Storing soil outdoors over winter

What's up guys. I did my first outdoor veggie garden this year. Everything was grown in pots, and I've got like 30ish gallons of soil I'm looking to amend and reuse next year. Would i have any problems doing so keeping the soil outside? Temps will get slightly below freezing but I can keep the dirt from freezing. Also when should I add my compost/amendments? A little now more early next season? All at once? Soil is mother of earth or something like that with added compost/perlite. Thanks for any help guys.

No problem storing it outside. I reuse soil and store it above ground (promix). I'd add any non composted amendments at the beginning of storage. If they've already been processed. Add the majority next season. Fresh ingredients for a fresh grow. A quality compost tea will wake the soil up.