Parsnips are the patient gardener's root crop: slow to germinate, slow to grow, and richly rewarding once autumn frosts sweeten them. This guide covers when to plant parsnips 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 parsnips in Zone 7
Sow parsnips as soon as the soil can be worked in late winter. Because germination takes 14–28 days, fresh seed matters more than with almost any other vegetable — buy new seed each year and sow generously, then thin. A spring sowing in late February to mid-March gives roots 100–130 days to size up before the autumn harvest window.
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 (100–130 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 | — (direct sow only; parsnips dislike transplanting) | Germination takes 14–28 days |
| Direct sow outdoors | Late Feb–mid-Mar, 2–4 weeks before the last frost | Sow into moist, prepared soil |
| Transplant outdoors | — | Harden seedlings off first |
| First harvest | Oct–Nov, 100–130 days after sowing | 100–130 days to maturity |
| Autumn / second sowing | A second sowing in June gives late-autumn roots | Count back from the first frost |
Starting and planting
Sow seed about half an inch deep in a fine, stone-free seedbed, in rows about 12 inches apart, and keep the soil evenly moist until seedlings appear — a board or a strip of burlap over the row helps hold moisture during the long wait. Thin seedlings to 3–4 inches apart once they are a few inches tall; crowded roots fork and stay small. Parsnips need deep, loose soil, so fork the bed well and never add fresh manure, which encourages forked roots.
Before sowing, fork the bed over, remove weeds and stones, and dig in well-rotted compost. Parsnips 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 3–4 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 parsnips 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 parsnips where others of the same family (Apiaceae) grew last year: rotate crops each season to reduce soil-borne disease and pest build-up.
Common pests and problems
Watch for carrot rust fly, aphids, wireworms. - Carrot Rust Fly — 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.
- Wireworms — 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
Dig parsnips from October onwards, once the roots are full size. A light frost actually improves them, converting starches to sugars, so there is no rush to lift the whole row — leave roots in the ground and dig as needed through late autumn, mulching heavily if a hard freeze threatens. Use a fork rather than pulling, since long roots snap easily in heavy soil.
Store lifted parsnips in damp sand or sawdust in a cool, dark place, or leave them in the ground under a thick mulch and dig through winter in mild spells. In the kitchen they roast, mash and soup beautifully, and their sweet, nutty flavour is at its best after frost.
The classic Zone 7 mistake with parsnips is giving up too early: seed that takes three to four weeks to appear looks like a failure, so gardeners re-sow on top of a row that was about to emerge. Mark the row, keep it moist, and wait.
Frequently asked questions
When should I plant parsnips in Zone 7?
Sow parsnips as soon as the soil can be worked in late winter. Work from the table above, using the average last frost (Mar 15–Apr 1) and first frost (Nov 1–15), with 100–130 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 parsnips 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 parsnips 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 parsnips in Zone 7?
The most common are carrot rust fly, aphids, wireworms. 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 parsnips after harvest?
Store lifted parsnips in damp sand or sawdust in a cool, dark place, or leave them in the ground under a thick mulch and dig through winter in mild spells. In the kitchen they roast, mash and soup beautifully, and their sweet, nutty flavour is at its best after frost.
See the Zone 7 March planting guide for what else to sow and plant in the same month, browse the full planting calendar, and try the Seed Spacing Calculator to plan your dates. For a related crop, see when to plant rutabaga in Zone 7.