Brussels sprouts are a cool-season crop that tastes better after frost — which makes Zone 7's long, mild autumn the ideal time to grow them. This guide covers when to plant brussels sprouts zone 7 in detail: the sowing, transplanting and harvest windows for USDA Zone 7, plus spacing, soil, water, companions, pests and storage — all based on USDA zone averages and standard published crop ranges.
Zone 7 covers areas with average annual minimum temperatures of 0 to 10°F. The average last spring frost falls in the Mar 15–Apr 1 range and the average first autumn frost in the Nov 1–15 range. These are USDA zone averages, not exact dates for any one garden — check your local extension service and the forecast before planting tender crops outside. The frost-free season runs roughly seven months, from late March into early November,
When to plant brussels sprouts in Zone 7
In Zone 7, Brussels sprouts are best treated as an autumn crop, not a spring one. Spring-sown plants bolt or produce loose sprouts in summer heat, while summer-sown plants mature into the cool days of October and November, when frost sweetens them. Start seed indoors in May or June, or direct-sow in June to early July, for a harvest 80–100 days later.
The table below puts the whole season on one page. All dates are ranges worked back from the Zone 7 frost averages (Mar 15–Apr 1 last frost, Nov 1–15 first frost) and the crop's published days to maturity (80–100 days). Use the frost date calculator to check the averages for your own area, and confirm them with your local extension service.
| Stage | Zone 7 window | Notes |
|---|---|---|
| Start indoors | May–June for the autumn crop | Germination takes 7–14 days |
| Direct sow outdoors | June–early July for autumn harvest | Sow into moist, prepared soil |
| Transplant outdoors | July, into rich, firm soil | Harden seedlings off first |
| First harvest | Oct–Dec, 80–100 days after sowing; flavour improves after frost | 80–100 days to maturity |
| Autumn / second sowing | The main Zone 7 crop is sown in summer for autumn harvest | Count back from the first frost |
Starting and planting
Transplant in July, spacing plants 18–24 inches apart in rows about 2–3 feet apart. Sprouts like firm soil — tread the bed down after planting, since loose soil gives loose, blown sprouts. Feed well with compost, keep plants watered through summer, and remove yellowing lower leaves as the sprouts form. Top the plants (pinch out the growing tip) in early autumn to push energy into the sprouts.
Before sowing, fork the bed over, remove weeds and stones, and dig in well-rotted compost. Brussels Sprouts grows best at a soil pH of 6.0–7.0 — test your soil through your local extension service before amending it.
Spacing, sun and soil
Space plants 18–24 inches apart. Crowded plants compete for light, water and nutrients, stay small, and invite disease through poor airflow, so thin seedlings to the final spacing once they are established.
This crop needs full sun — at least six hours of direct sun a day, and more is better. In Zone 7, a south-facing bed or an open spot away from trees and fences gives the strongest growth and the best flavour.
Soil should be deep, fertile and free-draining, with a pH of 6.0–7.0. Heavy clay improves with compost and organic matter, and raised beds help where drainage is poor.
Watering
Water needs are moderate: aim for steady, even moisture rather than feast-and-famine watering. About an inch of water a week from rain or irrigation is a useful guide in most Zone 7 summers, more in hot, dry spells. Water at the base of the plant in the morning, mulch to hold moisture, and avoid wetting the leaves, which invites disease.
Companion planting
Good companions for brussels sprouts include marigolds, basil, onions, lettuce. Planting companions nearby can help with pest confusion, pollination and making the most of bed space — marigolds, for example, are a classic companion across the vegetable garden. The companion planting finder can suggest combinations for your whole bed. Avoid planting brussels sprouts where others of the same family (Brassicaceae) grew last year: rotate crops each season to reduce soil-borne disease and pest build-up.
Common pests and problems
Watch for cabbage worms, aphids, flea beetles, slugs. - Cabbage Worms — inspect weekly; hand-pick or wash off with water, and encourage natural predators.
- Aphids — inspect weekly; hand-pick or wash off with water, and encourage natural predators.
- Flea Beetles — inspect weekly; hand-pick or wash off with water, and encourage natural predators.
- Slugs — inspect weekly; hand-pick or wash off with water, and encourage natural predators.
Beyond pests, the main problems are weather-related: a late frost after transplanting, drought at a critical stage, or waterlogged soil after heavy rain. Cover tender plants with frost cloth if a late frost threatens, and mulch to even out soil moisture.
Harvest and storage
Harvest from October onwards, picking the lowest sprouts first as they reach about an inch across and feel firm. Work up the stem over several weeks, and leave the top cluster to last. Sprouts left on the plant through light frosts taste noticeably sweeter than those picked early.
Sprouts keep for two to three weeks in the fridge, and plants can be left standing in the garden under a light mulch well into December in mild Zone 7 winters. Blanch and freeze any surplus for winter cooking.
The classic Zone 7 mistake with Brussels sprouts is sowing them in spring like cabbage. Summer heat ruins the crop — sow in early summer, harvest in autumn, and let the frost do the flavouring.
Frequently asked questions
When should I plant brussels sprouts in Zone 7?
In Zone 7, Brussels sprouts are best treated as an autumn crop, not a spring one. Work from the table above, using the average last frost (Mar 15–Apr 1) and first frost (Nov 1–15), with 80–100 days to maturity. These are USDA zone averages, not exact dates for any one garden — check your local extension service and the forecast before planting tender crops outside.
How much sun does brussels sprouts need in Zone 7?
Full Sun — at least six hours of direct sun a day where possible. Give it the sunniest spot you have.
What soil pH does brussels sprouts prefer?
A pH of 6.0–7.0. Test your soil before amending it, and add compost to improve structure whatever the pH. Your local extension service can test a sample and recommend amendments.
What pests attack brussels sprouts in Zone 7?
The most common are cabbage worms, aphids, flea beetles, slugs. Inspect plants weekly, hand-pick larger pests, wash small ones off with water, and keep the bed clean and well-spaced so air circulates.
How do I store brussels sprouts after harvest?
Sprouts keep for two to three weeks in the fridge, and plants can be left standing in the garden under a light mulch well into December in mild Zone 7 winters. Blanch and freeze any surplus for winter cooking.
See the Zone 7 September planting guide for what else to sow and plant in the same month, browse the full planting calendar, and try the Harvest Date Calculator to plan your dates. For a related crop, see when to plant collard greens in Zone 7.