Actually, most anyone who could leave London in the heat of summer would do so. July and August were not great months in a city that still used the Thames for its sewer and refuse.
The harvest began in August and September. In fact, September 24 was a day associated with beginning harvest in much of medieval England.
Fox hunting began after the first frost, and after all the harvest had been brought in. Before that, however, the hunt master would take out his young hounds and start to train them with a "drag" (the scent of a fox in a bag, possibly even a dead fox in a bag) so they would learn to hunt properly and obey the master's and the huntsmen's commands. This season of "cub hunting" (the cubs were the young hound, not young foxes) was, and still is, an excellent time to begin training young horses as hunters, and a season to start getting older horse fit for the hunt again. (Most hunters were put out to pasture in the spring and summer so they could have some rest between hunting seasons.)
Shooting season began in mid-August, with grouse. Additional game birds came in season as of September 1, and woodcock and pheasant seasons opened on October 1. Originally, the Forest Laws covered hunting and shooting rights. Put into place by William the Conqueror, these acts carried harsh penalties for poaching or for even using the king's forests. Gradually, the acts relaxed and opened up to allow for nobles, and then for landowners to hunt, shoot, and use the forests--and the forests themselves were reduced over the centuries for building ships, houses, and cities. However, the Black Act of 1723 put into place the death penalty for over 50 crimes, including being found in a forest while disguised (poachers were blackening their faces to hunt for food--a necessity, given the widespread poverty from the bursting of the South Seas Bubble). It was not repealed until the reforms of 1823.
The Game Act of 1831 further loosened restrictions, and the right was at last given to anyone to kill game on their own land, or on that of another with permission.
Autumn months when a time when owners ate pheasant, partridge, duck and grouse. Fish for meals included perch, halibut, carp, gudgeons, and shell fish. Poachers also looked to snared hares for their pot. Beans were still fresh, and the fruits of summer gave way to pears, apples, nuts and the last harvest of grapes.
With the harvest put away, those in the country could settle into winter's hibernation, or look to return to London when Parliament again met in November.
Her Regency romances can be found in print or as ebooks on all formats, and her Regency Historical, The Cardros Ruby is currently on sale this September at Amazon.com.