What to Plant in July and August for a Fall Harvest

GardenDraft Team · June 4, 2026 · 8 min read

Part of: Planting Calendar & Frost Date Guides

By mid-July, most vegetable gardens are coasting: tomatoes are set, planting feels finished, and the empty bed where the peas came out is growing weeds. That bed is the most underused asset in American gardening. In most of the country, July and August open a second planting season, one that ends in crisp fall salads, frost-sweetened kale, and carrots in November, and it's routinely missed because nobody thinks "sow seeds" in 95° weather.

The count-back math

Fall planting runs on one formula, anchored to your first fall frost date (find yours by ZIP on the planting calendar; the dates come from NOAA 1991–2020 normals):

Sowing deadline = first frost date − days to maturity − 14-day fall factor

The fall factor is the part beginners miss: as days shorten in September and October, growth slows well below the seed packet's rate, which assumes lengthening spring days. Two extra weeks of cushion keeps a "60-day" cabbage from stalling at 90% grown when cold shuts it down. (Full explanation in our first frost date guide.)

Worked example, October 15 first frost: a 60-day carrot needs 60 + 14 = 74 days → sow by August 2.

What to plant in July and August, by weeks before first frost

For an October-15 frost, that table translates to: broccoli transplants and parsnips in early–mid July; the carrot/beet/kale group in late July; spinach and head lettuce in early August; quick greens through late August; radishes into mid-September. Warmer climates shift everything later — a December first frost means fall planting starts in September.

Two crops deserve special advocacy. Fall broccoli beats spring broccoli almost everywhere, because it matures into cooling weather instead of bolting heat. And spinach sown in late August can be eaten all fall, then overwintered under row cover for an absurdly early spring harvest.

The hard part: germinating cool-season seeds in hot soil

The fall garden's catch-22 is that cool-loving seeds must start in the hottest soil of the year. Lettuce goes thermally dormant above about 80°F soil; spinach is even fussier. The workarounds, in rough order of effectiveness:

• Start transplants indoors where it's 75°F, and set them out at 3–4 weeks old. This is the move for broccoli, cabbage, lettuce, and kale anyway.
• Shade the seedbed. A board laid over the row until the day germination starts, or 30% shade cloth on hoops for the first two weeks, drops soil temperature dramatically.
• Sow in the evening and water cold. Evening sowing plus a cool soak gives seeds a 12-hour head start before the next day's heat.
• Pre-sprout spinach in a damp paper towel in the refrigerator for 3–5 days, then sow the chitted seed.

Direct-sown roots (carrots, beets, radishes, turnips) can't be transplanted, so for them it's shade, evening water, and persistence. Carrots in particular may need a second sowing if week one cooks the first.

Keeping seedlings alive in August

Germination is half the battle; the other half is the first two weeks. Water daily (small seedlings in hot soil have no reserves), mulch as soon as plants are up, and watch for the late-summer pest wave — flea beetles and cabbage worms hit fall brassicas harder than spring ones. Lightweight row cover solves both insects at once, and the same cover becomes frost protection in October. One pass of compost before sowing replaces what the spring crop ate; fall crops otherwise need little feeding.

Don't guess the deadline

Every date in this article hangs on one number, your first frost date, and as our 43,000-ZIP analysis shows, that number varies by weeks even within a single USDA zone. Look yours up on the planting calendar, or let GardenDraft run the count-back for every crop in your plan automatically: it knows each variety's days to maturity, applies the fall factor, and tells you what's still sowable in your ZIP code today.