February in Zone 6 is when the gardening year truly starts. Days are lengthening, seed catalogues are arriving, and the first trays of seedlings go under lights. The average last frost of Apr 1–15 is still two months away, so February is an indoor month — but it is a busy one.
What February means in Zone 6
Zone 6 sits in the middle of the American garden map — cold enough for a real winter, with average annual minimums of -10 to 0°F, but with a growing season long enough for tomatoes, peppers and winter squash to finish comfortably. The frost-free season lasts about six months, from mid-April into late October. The average last spring frost falls in the Apr 1–15 range and the average first autumn frost in the Oct 15–Nov 1 range — USDA zone averages, not exact dates, so check your local extension service before planting tender crops outside. Our planting calendar by ZIP turns them into a month-by-month plan.
Zone 6's six-month frost-free season runs from mid-April into late October, and February sowings are timed to be ready for it. Tomatoes, peppers and eggplant started now will be sturdy transplants by mid-April; brassicas started in February will be ready to go out in March and April. Outdoors, the garden is still mostly dormant, but the first hardy sowings become possible in late February under cover.
February task list
- Start tomatoes, peppers and brassicas indoors under strong light. 2. Sow peas and cold-frame salads in late February. 3. Prune dormant fruit trees and roses before buds swell. 4. Test your soil if you have not already — results take a few weeks. 5. Order seeds and supplies; check that seed-starting mix and pots are ready. 6. Clean the greenhouse or cold frame and check that vents work.
What to start indoors now
Start tomatoes indoors in late February — about 6–8 weeks before the average last frost of Apr 1–15 — along with bell peppers (60–90 days) and eggplant (70–85 days) if you have not already. Start broccoli, cauliflower and cabbage indoors now too; they need 55–90 days to mature and will be transplanted in March or April. Give seedlings strong light: a sunny windowsill is the minimum, and a simple grow light hung a few inches above the seedlings is better. Use clean pots and fresh seed-starting mix, give seedlings strong light, and keep the soil moist but never waterlogged. Work out exact sowing dates with the seed-starting calculator.
What to direct-sow outdoors
Direct sow peas (60–70 days) outdoors in late February in mild spells, since peas are hardy and germinate in cool soil. Sow spinach (40–50 days) and lettuce under a cold frame or cloche, where the cover warms the soil enough for germination. Indoors, sow microgreens and herbs like parsley (70–90 days) and chives in pots for the windowsill. Prepare the bed first — fork it over, remove weeds, rake it level — then sow thinly, water gently, and thin seedlings to the spacing in the table below.
What to transplant now
No outdoor transplanting of vegetables happens in February in Zone 6, but bare-root fruit trees, roses and shrubs can still be planted while dormant. Start hardening off the onion and leek seedlings begun in January on mild days — a few hours outside in shelter builds sturdier plants — but bring them in at night. Houseplants that outgrew their pots can be repotted now, before the spring growth spurt. Harden seedlings off for a week first, plant on a cloudy day or in the evening, water them in well, and mulch around — but not against — the stems.
What to harvest this month
February harvests are the cold-frame rewards: lettuce, spinach and kale grown under cover, plus leeks and Brussels sprouts still standing in the garden. Parsnips left in the ground taste their sweetest now, after a winter of frosts — dig them on days when the ground is not frozen. Indoors, cut microgreens and herbs as needed. Harvest in the morning, when plants are cool and crisp, and pick little and often — regular picking keeps most vegetables producing.
Frost protection in Zone 6
The average last frost of Apr 1–15 is still ahead, so February frost protection is about the seedlings indoors and the hardy crops under cover. Keep a frost cloth ready for any peas or salads sown outdoors — a late-February cold snap can still bite. Vent cold frames on sunny days so plants do not cook, and close them before nightfall. Indoors, keep seedlings away from cold windows at night, and run a small fan on low nearby: gentle air movement builds sturdier stems and discourages damping off. When a cold night is forecast, water the soil in the afternoon, cover tender plants with frost cloth before sunset, and remove the covers in the morning. The Seed-Starting Calculator can help you time plantings around your frost dates.
Planting data for February in Zone 6
All figures below are broad published ranges from standard horticultural references, not exact figures — they vary by variety, climate and soil.
| Crop | Action this month | Days to maturity | Notes |
|---|---|---|---|
| Tomatoes | Start indoors (late Feb) | 60–85 | 6–8 weeks before last frost |
| Bell peppers | Start indoors | 60–90 | Slow growers; start early |
| Broccoli | Start indoors | 60–85 | Transplant out in March–April |
| Peas | Direct sow (late Feb) | 60–70 | Hardy; germinates in cool soil |
| Spinach | Sow under cover | 40–50 | Cold frame warms soil enough |
| Onions | Grow on indoors | 90–120 | Started in January; harden off on mild days |
Browse the full planting calendar hub for every Zone 6 month, and see the neighbouring months in this zone:
Frequently asked questions
What seeds should I start indoors in February in Zone 6?
Tomatoes in late February, plus bell peppers, eggplant, broccoli, cauliflower and cabbage. Onions, leeks and celery started in January should be growing on under strong light.
Can I plant anything outside in February in Zone 6?
Peas in late February in mild spells, and spinach and lettuce under a cold frame or cloche. Most outdoor sowing still waits for March, when the soil begins to warm.
When is the last frost in Zone 6?
The average last spring frost falls between Apr 1 and Apr 15. These are USDA zone averages — check your local extension service and the forecast before planting tender crops outside.
Why are my seedlings leggy?
Almost always not enough light. Move seedlings to the brightest spot you have, or hang a grow light a few inches above them and raise it as they grow. A small fan on low also builds sturdier stems.
Should I prune fruit trees in February?
Yes — February is a good month to prune dormant fruit trees and roses in Zone 6, while you can see the structure and before buds swell. Remove dead, crossing and inward-growing branches. Do not prune spring-flowering shrubs now.