They are more active in the summer months - when the temperature is at its highest.
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year around. during winter and fall they stay underground
I had a huge garter snake den in my backyard last spring. I got rid of every snake I seen come out of it. Didn't see any snakes all summer near it. Now it is getting fall I have seen snakes rooting around in it again. Big and small garter snakes. I have been watching and getting rid of the ones I see. I would say yes they return year after year to the same den to hibernate and have babies. I chased one over 50 yards before I lost it in through a privacy fence. It was a big one. over two inches in diameter and at least 4 ft long. About 3 hours later it was back. Needless to say it got away.
After mating, the female retains the developing embryos within her body, until they're fully developed. Each baby is ejected or 'born' from the cloaca - the ventral opening to the reproductive organs.
September 21st is the fall equinox,
They don't go out at night unless there is enough light.