There is no set date. Cool season grasses will stop growing when soil temps fall below a certain temperature. This time of year your grass should be growing less and less as winter nears. Right now I am mowing every two weeks, and I suspect in 2 or 3 weeks topgrowth will be done, you are probably 2 or 3 weeks behind me being in VA. The general recommendation is to mow shorter for your last mow, but not so short as to scalp the lawn, 1.5 -2 inches. This will lower your chances of snow mold and other early season diseases.

I believe there is no set date for the last mowing of the seasons. It is more dependent on weather conditions than any thing else. I live in central Indiana. Because of the lack of rain my last mowing of the season was about 13 weeks ago. We received very little rain during August and most of September, and the grass did not grow.

About a month ago I went over the yard with the mower, just to level it off so it was easy to blow the leaves.

So in my opinion, does the grass height indicate that it needs mowing?

I keep mulch mowing until all the leaves are gone.

Re height: In northern climates, the recommendation is to mow shorter. That minimized the pocket of air that can get trapped beneath the snow and cuts down on snow mold problems. In Virginia, you aren't going to see much/any benefit from that.

Thanks everyone for the responses. As seemed to be suggested, I'll let the grass tell me when its time to put the mower to bed for the season. I usually mow at 3", so maybe for the last mow once its stopped growing, I'll go down to 2.5 or so.

Bill - in most years you would be completely right about not worrying about snow mold too much over here, but given last year it is something to keep in the back of your mind. Of course I can guarantee that it won't be a problem this year because I bought snow insurance! (I went in with some neighbors on a snow-blower)

I do my last mowing Thanksgiving weekend and cut at 2". All leaves are down by then!