This guide answers when to plant dill zone 7 with timing worked out from USDA Zone 7 frost-date averages, not guesswork. Dill is the feathery, anise-scented herb for pickles, fish and potato salads, and in Zone 7 it is a fast, cool-season annual that goes from seed to harvest in just 40 to 50 days. It dislikes transplanting and bolts quickly in heat, so the trick is to sow it directly, sow a little at a time, and let a few plants go to seed so it self-sows for the next round.
Zone 7 at a glance
Zone 7 covers areas where average annual minimum temperatures run 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 from USDA and NOAA frost records, not exact dates for any one garden, so check your local extension service before planting tender crops outside. Use the frost date calculator to work out dates for your own garden, and browse the planting calendar hub for the full Zone 7 year.
When to plant dill in Zone 7
| Step | Timing in Zone 7 |
|---|---|
| Start indoors | Not needed — direct sow for best results |
| Direct sow outdoors | March to April, about 2 to 4 weeks before the last frost; sow every 3 weeks |
| Transplant outdoors | Rarely transplanted — sow in place |
| Autumn / second sowing | August for a autumn crop |
| Harvest | May to June (spring sowing); September to October (autumn sowing) |
The table above is the short answer. The detail matters because dill is hardy — a hardy crop that tolerates light frost, so it can go out weeks before the last frost. Start indoors when the table says so, using the seed-starting calculator to count back from your last frost, and harden seedlings off for a week before they go outside. The Zone 7 April guide shows what else is happening in the garden in that month.
How to plant dill
Direct sow in March to April, about 2 to 4 weeks before the last frost, sowing seed about a quarter of an inch deep and 12 to 18 inches apart; germination takes 7 to 14 days. Dill prefers soil with a pH of 5.5 to 6.5 and full sun, and it grows tall, so plant it where it will not shade shorter crops. Sow succession rows every 3 weeks, and sow again in August for an autumn crop.
Give dill full sun — at least six hours of direct sun a day for full-sun crops, or morning sun with afternoon shade where part shade is listed. Prepare the bed by forking in compost and removing stones and weeds, and check the soil pH: dill prefers 5.5–6.5. Space plants 12–18 inches apart — the spacing in the table below — and sow seed at the depth on the packet, keeping the seedbed moist until germination, which takes 7–14 days.
| Fact | Range |
|---|---|
| Sun | full sun |
| Days to germination | 7–14 |
| Days to maturity | 40–50 |
| Spacing | 12–18 inches |
| Soil pH | 5.5–6.5 |
| Sowing method | direct sow |
| Cold tolerance | hardy |
| Water needs | moderate |
Watering and feeding
Dill has moderate water needs: steady moisture keeps the feathery leaves tender, while dry soil pushes plants to bolt. Water at the base and mulch lightly to hold moisture. It needs little feeding — compost at planting is enough — and too much nitrogen makes soft growth that flops over in wind.
A layer of mulch — straw, shredded leaves or compost — helps on both fronts: it holds moisture in the soil, keeps roots cool, and stops soil splashing onto leaves and fruit. Keep mulch a few inches away from stems so it does not trap damp against them.
Companion plants and rotation
Good companions for dill include tomatoes, peppers, marigolds, cabbage. Use the companion planting finder to plan combinations for your whole bed. Rotate crops each year: do not plant dill where the same family grew last year, and keep a simple note of what grew where so you can rotate properly next season. Also see our guide to when to plant cilantro in Zone 7, which pairs well with dill in a Zone 7 bed.
Pests and problems
The common pests for dill are carrot rust fly, aphids, wireworms. Dill has few pests, but aphids can gather on flower heads — wash them off with water. Check plants weekly, looking under leaves as well as on top — most problems are easy to deal with if caught early. Good air flow helps: do not crowd plants, water at the base rather than over the leaves, and clear away dead leaves and debris where pests hide.
Harvesting and storing
Harvest leaves once plants are about 8 inches tall, usually 40 to 50 days after sowing, snipping the feathery fronds as needed. For seed heads, let plants flower and cut the heads when seeds turn brown, drying them in a paper bag. Use fresh leaves the same day, or freeze chopped dill; dried dill loses much of its flavour, so freezing is the better way to store it.
For the best flavour, harvest in the morning, when plants are cool and their moisture and oils are at their best, and use a sharp knife or scissors for a clean cut that heals quickly.
Frequently asked questions
When should I plant dill in Zone 7?
March to April, about 2 to 4 weeks before the last frost; sow every 3 weeks. As a rule, work back from the average last frost range of Mar 15–Apr 1 for spring planting, and back from the average first frost range of Nov 1–15 for autumn planting. These are zone averages, so check your local extension service for your area.
Can I grow dill in containers?
Yes, in most cases — choose a pot at least 12 inches deep with drainage holes, fill it with good potting mix, and water more often than beds, since pots dry out faster. Container growing suits dill well, especially where garden soil is heavy or space is limited.
How long does dill take to grow?
About 40–50 days to maturity from sowing or transplanting, depending on variety and weather. Germination takes 7–14 days. Warm, sunny weather speeds growth; cold or cloudy weather slows it, so treat these as ranges, not exact dates.
What soil pH does dill need?
A pH of 5.5–6.5 is ideal. Test your soil before planting and amend it if needed — your local extension service can test a sample and advise on what to add.
What grows well with dill?
Good companions include tomatoes, peppers, marigolds, cabbage. Avoid planting it where the same family grew last year, and give it the spacing and sun listed in the table above so companions do not crowd it out.