I usually would wait until the beginning of May before trying to drive into the Ranch UP on the tundra when the driveway (or road) hadn't been plowed all winter. If memory serves me right, at the time my car died it was snowing. My brother who lived UP on the tundra was following me the last 30 miles from his house to the Ranch when the '58 T-Bird died. He tried to tow it with his car, but because it was snowing, he wasn't able to pull it up the hills and we left it about 5 miles from home. Later I used my dad's pickup to tow it home. (Re: the Ranch, one of my teachers in high school started calling the place the Ranch. I told him that it was a farm and he said anyplace with acreage is a ranch out west, so I figured 'What the Hell' and have been calling it the Ranch since.)
It seems like most of the time when I would come home from farther away it would snow unless I came home in July. But it has snowed in July and every other month of the year at one time or another. My roommate at K.I. bitched about how it had snowed every month the previous year.
Anywho, the first week of May was the time I would plan on so as to be able to drive in without getting stuck in the snow. Sometimes there would still be snow in the shady areas of the driveway and it would take several tries to make it thru the snow.
At this point in time I have moved the timeline up to April. It would depend on what kind of winter it was as to whether it would be the middle of April or earlier.