Fall vegetable gardening will vary greatly across hardiness zones. Gardeners in zones 8 and up, who have waited patiently through the hazy heat of summer, can finally get all sorts of vegetable plants started, including tender tomatoes and eggplant. Here's some help for you lucky gardeners, with planting dates by area.
Gardeners in northern climates will have to content themselves growing vegetables that enjoy the cooler, shorter days of fall, like leafy greens, root vegetables, cabbages, broccoli and kale.. To have a fall garden mature before frost, you'll need to get it started in mid-summer. That means late July to August, depending on your zone. Many plants will grow well in cool weather, but they need to be started while it is still a bit warm and the days are longer.
Fall vegetable gardens are often just an extension of summer succession planting. As one plant is finished, another vegetable is planted in its place.
You can also start seeds in pots, to transplant later in the season, or look for nurseries that carry fall seedlings. And a few vegetables are hardy enough to direct seed,some are even better grown from seed.
Vegetables that can be Started from Seed
Beets - Beets are easy to grow in succession, allowing you a staggered harvest from spring into summer. Although beets will still grow in summer heat, they can have a tendency to get bitter and woody quickly. But late summer is a great time to resume succession planting, at 2-3 week intervals. The bulbs will keep growing until a hard freeze and even the tops can handle a bit of frost.
Bok choy - Bok choy and many other Asian greens, are well suited to fall planting. The so called "baby" bok choy varieties grow only about 8 inches tall and grow quickly, in about 40 days. They revel in cool weather and fall has the added advantage of less leaf pests. Since they won't bolt to seed as quickly as they might in warming spring weather, you can harvest heads as you need them.
Bush Beans - I've written about planting a fall crop of beans before. Pole beans need a long growing season. The vines have to grow tall, before they start setting beans. However many bush varieties will start producing in as little as 45 days. Bean plants are too tender to handle frost, but if a frost threatens, you can always toss a row cover over them until the temperatures climb again.
Carrots - Carrots are not the quickest growers, but some of the smaller varieties, like ‛Thumbelina' and ‛Paris Market', will mature in about 50 days.
Another option is planting your fall carrots in containers. Long window boxes with a depth of at least 6 inches are great for this. You can keep them close at hand, where they are convenient for watering and safe from four-footed pests.
Kale - Kale is probably the easiest cole crop to grow. The seeds germinate in warm or cool soil and it's grown for its leaves, so you don't have to worry about a head forming or the flowers bolting. The advantage of growing it in the fall is the magic that happens to so many vegetables that are grown in cool weather or hit by a light frost; the leaves will still have a great texture and the flavor with sweeten and deepen. Start seeds for fall harvesting in mid- to late summer or transplant in late summer.
Lettuce - Lettuce can be planted pretty much all season. In really hot weather, it can get bitter and bolt to seed. But most varieties take less than 50 days to mature, so you can start planting in mid-August and succession plant into fall. The plants may grow more slowly than in the spring, because the temperature is getting cooler, rather than warmer and because the days are shorter, but the flavor will be sweeter and crisper. Lettuce plants will require some protection against frost.
Lettuce is shallow rooted and is a great choice for containers. If you plant your fall lettuce in pots, it's very easy to move it indoors, to protect it from frost. Planted this way, you could have fresh lettuce well into winter.
Peas - Peas are another vegetable that loves to luxuriate in cool weather. Many short varieties will be ready to harvest within 50-60 days. They will germinate more quickly in warm weather, but they will also need more water and a little protection from the strong sun, while they are young. But by the time they are ready to start flowering and forming peas, the days and nights should be the perfect temperature in fall, to keep them going.
Radishes - Radishes like to grow quickly and in cool, moist soil. Most of the problems associated with growing radishes in the spring (woody texture, hot and bitter taste, small bulbs...) will be alleviated by planting them in the fall.
You might also want to experiment with some of the "winter" radishes, like ‛Round Black Spanish'. They tend to grow more slowly than globe radishes and do not like heat. They prefer being planted in mid-summer and allowed to develop into fall. You can harvest bulbs in late fall to winter or allow them to over-winter in the soil and harvest next spring. They grow very much like turnips.
Spinach - If you've been frustrated by your spinach bolting before it's even large enough to eat, you are going to love growing it in the fall. Spinach only takes about 30-40 days to mature and even less, if you like small, tender leaves. You can get several succession sowings of spinach in throughout the fall. Spinach seeds are also perfect for winter sowing.
Swiss Chard - If you've been harvesting your Swiss chard as cut-and-come-again, you won't even have to reseed it. The plants have probably slowed down a bit during summer, but with a little cool air and water, they will switch back into full production. They may even survive the winter, but harvest them quickly in the spring, before they start to bolt to seed and get tough and bitter.
If you need to start a new crop in the fall, plan on it taking about 50–60 days to mature. Although the plants will survive frost, you will want to provide some protection or the leaves may be damaged.
Now, let's talk about vegetables that can be transplanted as seedling, in the fall garden.