9 Fast-Maturing Vegetables for an Early Fall Harvest

Written by Caitlin Havener Rogers — Certified Precision Nutrition Coach

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If you’re anything like me, late summer sneaks up and suddenly you’re staring at a garden bed that’s half done producing tomatoes and half just sitting there, empty and a little sad. The good news is you don’t need months to get another round of fresh veggies going before the cold really sets in. There’s a whole crew of vegetables that grow fast, love the cooler air, and can go from seed to plate before your first frost even shows up on the forecast.

This is the stuff I actually plant every year when I want salads, stir fries, and roasted veggie trays without waiting until next spring. Some of these are ready in as little as three weeks, which honestly still surprises me every single time. Let’s go through the nine that consistently earn a spot in my late summer garden lineup.

1. Radishes

Radishes are basically the overachievers of the vegetable world. Harvest radish in 21 to 30 days, making them the sprinters of the vegetable garden, ready to harvest in as little as 21-30 days from sowing. That means you could plant them right now, in late July, and be pulling them out of the ground before school even starts back up.

What I love about radishes for busy weeks is how little fuss they need. You just direct sow them, keep the soil a little moist, and thin the seedlings so they aren’t crowded. Toss them sliced into a quick grain bowl, roast them with olive oil until they get a little sweet, or just eat them raw with a sprinkle of salt while you’re waiting for dinner to finish.

2. Arugula

Arugula is one of those greens that rewards you almost immediately for planting it. Its flavor is at its best when grown in cool temperatures, and it matures in as little as 30 days. Fall is honestly its best season, since the cooler weather keeps the leaves tender instead of turning them bitter and overly peppery.A couple of favorite varieties include Esmee arugula, which is more nutty than spicy and exceptionally cold tolerant, and Astro arugula, which is moderately spicy with excellent heat and cold tolerance. On a normal weeknight, I’ll toss a handful into pasta right at the end of cooking so it wilts just slightly, or pile it onto a sandwich for a little kick. It’s an easy way to sneak more greens into meals without anyone really noticing.

3. Spinach

Spinach is a fall garden classic for a reason. Baby spinach typically reaches harvestable size in 25 to 35 days, with germination occurring in five to nine days and first true leaves appearing at 10 to 14 days under optimal conditions. That’s a pretty quick turnaround for something this versatile.This frost-loving vegetable can survive down to 20°F, so it’s an excellent choice if you want to keep harvesting salads in winter. I like to just snip a few outer leaves at a time rather than pulling the whole plant, since that keeps it producing for weeks. Blend it into a smoothie, wilt it into a quick pasta sauce, or throw a handful into scrambled eggs or a tofu scramble for an easy nutrition boost.

4. Lettuce

Lettuce might be the most forgiving vegetable on this list, which is exactly why it’s a staple in my fall garden. You can harvest the outer leaves while the plant keeps growing, so it doesn’t feel like a one and done situation. Baby leaves are ready in about 30 days, with full heads following a bit later.If you succession plant it every couple of weeks, you basically guarantee yourself salads well into the cooler months. If succession planted, lettuce can provide at least two harvests before frost sets in, as long as you have a minimum of 40 days before your first freeze. On busy nights, a big bowl of fresh lettuce with whatever beans, roasted veggies, or leftovers you have on hand turns into dinner in about five minutes.

5. Turnips

Turnips are one of those vegetables people tend to forget about, but they’re a great two for one crop for a fall garden. Turnips love cool weather around 60°F and are quick growers with about 60 days between planting and maturity, which means you can often get multiple harvests in both fall and spring by succession planting. The greens actually come along even faster than the roots do.You don’t need to wait long to begin seeing results, since you can harvest young leaves within three weeks of sowing, and roots in as few as five. I like roasting the roots until they’re golden and a little caramelized, and sautéing the greens with garlic the same way you’d cook kale or chard. It’s a low effort way to get two vegetables out of one packet of seeds.

6. Bok choy

Bok choy is one of my favorite fast crops because it feels a little more exciting than another bowl of lettuce. Bok choy is ready to harvest in just 50 days after sowing the seeds, and it prefers cool spring and fall weather. If you’re impatient, though, baby varieties move even quicker.While regular bok choy takes months to mature, the smaller cultivars often referred to as baby bok choy are ready for harvest in just one month. This is one I genuinely reach for on weeknights because it cooks so fast in a stir fry, soaks up whatever sauce you throw at it, and works just as well tossed into a noodle soup when the weather starts cooling off.

7. Swiss chard

Swiss chard is the vegetable I recommend to anyone who says they don’t have a green thumb, because it really is hard to mess up. Swiss chard delivers nutritious greens with colorful stems in just 25 to 60 days, depending on whether you’re harvesting baby leaves or full sized plants. The rainbow stems also just make the garden look prettier, which is a nice bonus.What sets it apart from lettuce or spinach is that chard handles summer heat surprisingly well, continuing to produce when lettuce and spinach have already bolted. That means it bridges the gap nicely between your fading summer garden and your true fall crops. I usually chop the stems and leaves separately, since the stems need a little extra cooking time, then sauté the whole thing with garlic and a splash of lemon for a simple side dish.

8. Beets

Beets are one of those vegetables that quietly give you more than you bargained for. Beets are very cold tolerant, with some varieties able to handle a light frost, and they’re ready to harvest in about 60 days, though you can harvest earlier for baby beets. If you’re short on time before frost, pulling them young is a completely reasonable move.The greens are the part people tend to overlook, and that’s a shame because the beet greens can be harvested and added to soups or salads, as long as you use the outer leaves and always leave four or five leaves to help develop the root. Roasted beets are an easy make ahead side for the week, and the greens cook up almost exactly like chard or spinach in a hot pan.

9. Kohlrabi

Kohlrabi doesn’t get nearly enough attention, probably because it looks a little strange sitting there in the garden like a small green alien. Kohlrabi typically takes 50 days to mature, though you can pull it earlier without sacrificing too much in size, and the bulbs and leaves are both edible, giving you a double harvest before the season ends. That’s a lot of food from one plant in a pretty short window.For the best texture and flavor, it helps to pick it on the smaller side rather than letting it sit and get woody. I like shredding it raw into a slaw with a little lime and salt, or roasting cubes of it the same way you’d roast potatoes, since it gets a similar soft, slightly sweet bite once it’s cooked through.

Getting a second round of harvests before the weather turns cold really just comes down to picking crops that don’t need a long runway. Every vegetable on this list can realistically go from seed to table in a matter of weeks, which makes late summer feel a lot less like the end of the growing season and more like a second chance at it. A little succession planting, a soil thermometer if you want to get fancy, and some patience with the shorter fall daylight hours will carry most of these crops right up to your first frost date without much drama.