Hello and thanks for researching this very important question!
Fall is the time of year that snakes look for a burrow to spend the winter. They often do not eat during this time. Their bodies are preparing for a rest and many systems shut down.
Captivity can interrupt and cause stresses to these programmed functions that can lead to fatalities.
A common species such as this can be cared for more easily in the spring...they do best when fed goldfish from the pet store! This is a good source of vitamins, protein and calcium. Bugs are lacking in many nutrients, and should be supplemented with large earthworms.
***Please check your local wildlife regulations to be sure that you are permitted to keep such a species where you live--most states and local towns have laws governing this type of situation. You may wish to purchase a captive-raised snake from a reptile pet store. This would be a snake bred for tameness and ease of indoor care...Ribbon Snakes are what is usually found in the pet trade, the nearest relative to Garters.***
Here is a link to a site that contains other information about providing a good habitat for this species:
http://www.wnyherp.org/care-sheets/snakes/garter-ribbon-snake.php
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