This article is from garden.org and are cosidered as a planting guide for Bulgaria. (Link at the bottom)
Gardening in the fall can be much more challenging than spring planting, because you are in a race to get your crops mature and harvested before the winter frosts begin, around November 25. This means you need to consider how much time each variety needs between planting and picking. Those numbers vary widely between different varieties of the same kinds of plants! Usually the "Days to Harvest" are present on the seed packet.
Most tomatoes, peppers and eggplants, for example, require around 100 days to harvest, therefore you'd want to transplant those into the ground around August 17. Anyway, it's important to remember that the numbers in this fall planting guide are only a starting point for you! Good luck and good gardening to you.
Fall is the time to plant garlic. Around October 11, take your cloves apart and plant the toes about 3 to 4 inches deep. This may not be accurate! Garlic dates vary wildly around the country. The way to be sure is to use a soil thermometer. When the soil temperature is 60° at a depth of 4 inches, then plant your garlic.
Cole crops like broccoli, cauliflower, and cabbage can be direct seeded into your garden around September 16, but because of the heat during that time of year, it's better to start them indoors around July 28 and then transplant them into the garden around September 6. Do the same with lettuce and spinach.
Sow peas directly around September 11.
Now, for all the usual hot weather veggies like beans, cowpeas, corn, squashes, pumpkins, cucumbers, watermelons, gourds and sunflowers, you should plant those seeds directly into the ground around August 12.
Okay, now here are the cold, hard numbers, along with specific plants: