They are meant to lose their leaves at this time of year so I wouldnt worry. Dont waste your money adding fertilizer until growth strats again in the spring.
welcome to GoY too.

Seaburn is correct. Also small red maples can lose the ends of their branches over winter due to frost damage . Don't worry about this. Wait until new leaves appear in the spring and prune off any shoots that have died back.

Welcome to GoY :)

Welcome, Ron! Seaburngirl and Anchorman are both right--going bare is the normal thing to happen this time of year. Since I don't know your State, it is hard to tell if you need to worry much about winter damage. If you garden in a colder area than USDA zone 6a, I would take the precaution of inserting some evergreen branches around the lower 2 ft. of the tree so you won't have the roots die or have to start from just a stump if it gets too cold for it this winter. When you see the buds just starting to swell in spring, you can slip the branches out along the ground.

Ah! I hadn't spotted Ron is from the US. Obviously there will be states in the US where maples require protection.