I do feed deer starting pretty early in the season. Lay down "horse feed" (costs half as much as "deer feed" and aside from the tag on it, it's the same stuff in the bag).
The small critters, coons and birds eat more than the deer ever will, but my purpose is to get deer coming around for an easy meal.
A week out from the start of early bow (1 October in most of Ontario) I start laying down the apples - about half a bushel every few days (if you can get there to drop them). I have apple trees on my property, but most of the smaller country stores sell "deer apples" (culls) for 5 or 10 bucks a bushel.
Depending on what "your deer" are normally eating, carrots, other greens or even pumpkins might bring them in. I hunt dense hardwoods with the closest Ag fields being many miles away - "my deer" will watch a carrot or pumpkin rot before they would even give it a taste, but lay down a five pound bag of Acorn Rage and they are all over it. Chestnuts also work well - although not "natural" to the area they don't seem to see them as "alien" the way they do carrots or pumpkins.
As others have noted, while this does bring deer around, camera's have pretty well shown (where I hunt) that the big bucks are generally nocturnal - the only real time you get them in full shooting light is during the rut when they are trying to get some "doe tail"

Although I have taken a handful of bucks very early in the bow season (like the first 5 days or so) - all have come in to either apple or curiosity "scent sticks".
If you are going to feed plan on really feeding though. If you are just going to "toss some food" once in a while the deer won't pattern to the area.
Last year between the start of the bow and first week of the gun (had tagged out by then) we (two of us) had laid down 400 pounds of grain, easily 20 bushels of apples plus maybe 20 pounds of loose minerals and a couple of salt lick blocks. That may sound expensive, but at a feed store you can get 50 pounds of "horse feed" for about 10 bucks...