Garlic is a wonder to grow, and a beautiful thing to hang in the kitchen as a long braid of many heads (if it is a soft-neck variety--usually available only through an on-line seed vendor). You can just buy any old garlic at the grocery store, separate the cloves, and stick one in the ground every 6". Planting time is now, into November, regardless of your frost date. It will slowly grow through the winter. Some time in June, you'll have a head of garlic for every clove you planted. Just weed it occasionally. I planted tobacco into beds that grew garlic, and noticed no issues with it.
I planted some garden peas at the end of August, trellised by 3' dead stalks of the corn that failed this summer. They are just now beginning to blossom. Although they easily tolerate light frosts, I doubt they'll produce before the first hard frost.
Bob