12 Fast-Growing Vegetables to Plant in Summer (30–60 Days)

It’s the middle of summer and you’re either looking at empty beds you never got around to planting, or gaps where the spring crops just finished. Good news: it is absolutely not too late. A whole category of vegetables races from seed to harvest in 30–60 days — fast enough to squeeze in a full extra crop before fall, even if you’re starting now.

This is your shortlist of the fastest, most reliable summer-plantable vegetables, plus how to get them up in the heat (the one part that trips people up).

TL;DR — the fastest crops to plant now

The speed champions are radishes (25–30 days), salad greens and arugula (30–40), bush beans (50–55), and summer squash/zucchini (45–55). The trick to summer sowing is keeping the soil moist and a little shaded until seeds sprout — heat dries the surface and stalls germination. Sow a small batch every 2 weeks (succession planting) and you’ll harvest continuously into fall.

The 12 fastest summer vegetables

Roughly fastest to slowest. “Days” = seed to first harvest in good summer conditions.

1. Radishes — 25–30 days. The undisputed speed king. Direct-sow, thin, harvest in under a month.
2. Arugula — 30 days. Peppery salad green; cut leaves young, comes back for more.
3. Lettuce (leaf/baby) — 30–45 days. Cut-and-come-again; give it afternoon shade in peak heat or it bolts.
4. Spinach (heat-tolerant types) — 30–45 days. Choose bolt-resistant summer varieties; regular spinach struggles in heat.
5. Bok choy / pak choi — 30–45 days. Fast, productive, great stir-fry green.
6. Green onions / scallions — 30–60 days. Snip as needed; endlessly useful.
7. Bush beans — 50–55 days. Heavy producers, fix nitrogen (improve your soil), love summer warmth.
8. Summer squash / zucchini — 45–55 days. One or two plants can feed a household — almost too productive.
9. Cucumbers — 50–60 days. Thrive in heat; train up a trellis to save space and get straighter fruit.
10. Kale — 50–60 days for full leaves (sooner for baby). Productive for months; cut outer leaves and it keeps going.
11. Swiss chard — 50–60 days. Heat- and cold-tolerant, cut-and-come-again all season.
12. Beets — 50–60 days. Two crops in one — roots and edible greens.

The one trick: getting seeds up in summer heat

Most “my summer planting failed” stories come down to germination, not the plant. Hot, dry surface soil bakes seeds before they sprout. Fix it and the rest is easy:

• Keep the surface consistently moist until seedlings emerge — that may mean a light watering once or even twice a day in a heatwave. (Our summer watering guide covers the deeper rules once plants are established.)
• Shade the seedbed lightly — a board, shade cloth, or even a thin mulch layer keeps the soil cooler and damper until sprouts appear, then remove it.
• Sow a touch deeper than spring, so seeds sit in cooler, moister soil.
• Pick heat-tolerant / bolt-resistant varieties for greens — the seed packet usually says.

Plant in waves, harvest all season

The single highest-return habit for fast crops is succession planting: instead of sowing all your radishes or beans at once, sow a small batch every 1–2 weeks. You get a steady trickle of harvest instead of a glut-then-nothing, and beds refill the moment they clear. It’s the difference between “a big radish day” and “radishes whenever you want them” for two months straight.

Just count backwards from your first expected fall frost: take the crop’s days-to-harvest, add a couple weeks of buffer, and that’s your last safe sowing date.

Quick wins vs. things to avoid

FAQ

What vegetables can I still plant in summer?

Plenty — focus on fast growers: radishes, arugula, leaf lettuce, spinach (heat-tolerant types), bok choy, green onions, bush beans, summer squash, cucumbers, kale, Swiss chard, and beets. Most go from seed to harvest in 30–60 days, so even a mid-summer start gives you a full crop before fall. Just check your first-frost date and choose crops that fit the remaining window.

What is the fastest growing vegetable?

Radishes — about 25–30 days from seed to harvest, faster than almost anything else. Close behind are arugula and baby salad greens (around 30 days). These are ideal when you’ve started late or want a quick win, and they’re perfect for succession sowing every couple of weeks for a continuous supply.

Is it too late to plant a summer vegetable garden?

Usually not. The key number is your area’s first fall frost date. Count backwards: take a crop’s days-to-harvest, add ~2 weeks of buffer, and if that lands before your frost date, you can plant it. Fast crops (radishes, greens, bush beans) keep the door open well into summer, and in mild climates you can sow into early fall.

How do I get seeds to germinate in hot weather?

Keep the soil surface consistently moist — water lightly once or twice a day until seedlings emerge — and shade the seedbed with a board, shade cloth, or thin mulch to keep it cooler and damper, removing it once sprouts appear. Sowing a little deeper than you would in spring also helps, putting seeds in cooler, moister soil. Heat-dried surface soil is the main reason summer sowings fail.

What does “succession planting” mean?

It means sowing small batches of a crop every 1–2 weeks instead of all at once. For fast vegetables this gives you a steady, continuous harvest rather than a single glut followed by empty beds. As one small sowing is harvested, the next is coming on — and beds get replanted the moment they clear, maximizing how much food a small space produces over the season.

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