What to Plant in February in Pennsylvania

February is the month Pennsylvania gardeners shift from planning to doing. Nothing goes in the ground yet — except in the warmest corners of zone 7a — but what you start under lights in February determines how your entire warm-season garden performs come May and June. Peppers especially need every one of these February weeks; start them late and you’ll be chasing the season all summer.

This guide covers what to start indoors in February by zone, what to order and prep before March arrives, and the few outdoor tasks that are actually worth doing in a Pennsylvania February.

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What February Means for Pennsylvania Gardeners

Outside, Pennsylvania in February ranges from reliably frozen in the northern tier (zones 5a–5b) to occasionally thawing in the Philadelphia region (zone 7a). Either way, the ground is not workable and nothing goes in the soil outdoors for at least 6–10 more weeks in most of the state. But indoors, February is the single most important seed-starting month of the year for warm-season crops.

The logic is simple: peppers, onions, leeks, celery, and slow-germinating herbs like rosemary need 10–12 weeks of indoor growing time before they’re ready to transplant after your last frost. Count 10 weeks back from a typical late-April last frost date (central PA, zone 6a) and you land squarely in mid-February. Start late and you’re transplanting underdeveloped seedlings — start on time in February and you’re putting out stocky, root-bound plants ready to hit the ground running.

February is also your last reliable window to order bare-root plants and seed potatoes before spring inventory sells out. Bare-root strawberries and asparagus crowns ship in March and April — ordering in February ensures you get the varieties you want.

What to Start Indoors in February

February indoor starts are mostly long-season crops that need a head start to reach full production potential within Pennsylvania’s warm season. Here’s what belongs under your lights in February:

Peppers — Start Now, All Zones

Peppers are the most time-sensitive February start in Pennsylvania. They’re slow germinators (10–21 days even with heat), slow growers, and need a minimum of 10–12 weeks indoors before they’re ready to transplant. Start too late and you get small plants with limited fruit set before fall cold shuts them down. According to Penn State Extension’s pepper production guide, peppers require soil temperatures of 75–85°F for optimal germination — a heat mat under your seed trays is not optional for February starts in a cool house.

Sow pepper seeds 10–12 weeks before your expected last frost. In central PA (zone 6a, last frost ~April 25), that puts your start date at February 1–15. In zone 7a (Philadelphia, last frost ~April 5), aim for the first week of February. In zone 5a (northern PA, last frost ~May 15), you can start mid-February and still hit 12 weeks.

Onions and Leeks — Start Now, All Zones

Onions and leeks are among the slowest crops from seed to transplant — they need 10–12 weeks indoors to reach transplant size, and leeks can take even longer. Starting them in February gives Pennsylvania gardeners a realistic shot at bulb onions that actually size up before summer heat triggers early maturation. Onions started in March are still viable but will be smaller at transplant, which typically means smaller bulbs at harvest.

Sow onion seeds thickly in a flat, thin to 1 inch apart, and trim tops to 3–4 inches every few weeks to encourage thicker stems. Long-day varieties — the standard for Pennsylvania — need to be started from seed rather than bought as transplant bundles if you want specific varieties like Walla Walla, Ailsa Craig, or Copra.

Celery and Celeriac — Start Now, All Zones

Celery is one of the most demanding crops to start from seed — it germinates slowly at cool temperatures and needs 10–12 weeks of growing time before it’s anywhere near transplant size. Sow seeds on the surface (they need light to germinate), keep the soil consistently moist, and expect germination to take 2–3 weeks. Celeriac follows the same schedule and is generally more forgiving once established.

Slow Herbs from Seed — Start Now

Rosemary, lavender, and thyme started from seed are notoriously slow. Rosemary in particular can take 3–4 weeks to germinate and another 8–10 weeks to reach transplant size. February is not too early for these — it’s exactly right. Germination rates are lower than most vegetables, so sow more seeds than you think you need. These herbs are perennial in most of Pennsylvania (rosemary is marginal in zones 5a–6a) and worth the investment of a long indoor start.

Zone 7a Only: Tomatoes (Late February)

In the Philadelphia region (zone 7a, last frost around April 5), very late February is technically correct for starting tomatoes — exactly 8 weeks out. However, most zone 7a gardeners are better served waiting until the first week of March to avoid oversized transplants. If you start February 15 and your last frost is April 5, you have 49 days — tomatoes can get too leggy in that window if light isn’t perfect. Start zone 7a tomatoes the last week of February at the very earliest.

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February Tasks by Zone

Indoor Seed-Starting Timing Table for Pennsylvania

Use your zone’s last frost date and count backward by the weeks listed to find your February (and early March) start dates. These timings align with what the Old Farmer’s Almanac recommends for pepper starting — adjusted for Pennsylvania’s specific zone range. Find your exact frost dates using the Pennsylvania frost dates by region guide.

Your February Seed-Starting Setup

February starts live or die based on two things: heat and light. Pennsylvania homes in February average 65–68°F — not warm enough for reliable pepper germination, which wants soil at 75–85°F. Once seeds sprout, they need 14–16 hours of direct light per day; a south-facing window in February delivers maybe 5–6 hours of weak light at best. Most PA gardeners need supplemental light to avoid leggy seedlings that fall over before they make it to the garden.

A dedicated grow light setup doesn’t need to be expensive. Keep lights 2–4 inches above seedling tops and raise the fixture as plants grow. A simple timer set to 16 hours on / 8 hours off removes one variable entirely. For soil temperature, an inexpensive soil thermometer lets you verify your heat mat is actually maintaining the 75–80°F sweet spot instead of guessing.

Cornell Cooperative Extension’s home gardening guide recommends using a sterile seed-starting mix rather than potting soil for germination — it’s finer-textured, drains better, and contains no weed seeds or pathogens that can wipe out a flat of seedlings before they’ve developed their first true leaves.

What NOT to Start in February

The most common February mistake is starting tomatoes too early. Eight weeks before transplant is the maximum — six weeks is actually better for most Pennsylvania gardeners, producing stockier, more transplant-ready plants. In zones 5a–6b, tomatoes started in February will be overgrown, root-bound, and struggling by late April when it’s still too cold to go outside. Wait until mid-to-late March for tomatoes in most of PA.

Similarly, hold off on cucumbers, squash, zucchini, melons, and beans entirely — these fast growers need only 3–4 weeks indoors (cucumbers, squash) or go directly in the ground (beans). Starting them in February produces plants that are well past their prime by the time soil is warm enough to accept them. The what to plant in March in Pennsylvania guide covers what enters the rotation next month — tomatoes, brassicas, and more cool-season direct sowing.

Outdoor February Tasks Worth Doing

Most Pennsylvania gardeners have limited outdoor options in February, but a few tasks are genuinely worth doing on mild days when the ground isn’t frozen solid or covered in snow.

Pruning dormant fruit trees and shrubs is the most valuable February outdoor task, especially in zones 6b–7a where late February temperatures can reach the 40s and 50s. Dormant pruning before bud swell is ideal for apples, pears, and stone fruits — the cuts heal cleanly and disease pressure is at its lowest. Zones 5a–6a gardeners may need to wait until early to mid-March when temperatures stabilize.

Soil and bed assessment is another useful February activity. Walk your raised beds and garden areas on a dry day to note what needs amendment, where drainage problems appeared last year, and where you want to add new beds. Reading your Pennsylvania hardiness zone carefully and matching it to your new season’s crop list while you still have time to order is one of the highest-value hours you’ll spend in February. If you’re planning new raised beds or amending existing ones this spring, the Pennsylvania soil guide covers what to add and when for different soil types across the state.

In zone 7a, late February can allow spinach, kale, or lettuce seeds under a cold frame — soil temperatures may reach 40°F, enough for cold-tolerant crops to germinate slowly. This is an optional bonus, not a standard task, and depends heavily on whether your February is running warm or cold. Check the December and January planting guide for the cold-frame techniques that also apply in late February zone 7a conditions.

Frequently Asked Questions

Related Guides

Keep your planting season moving with these Pennsylvania gardening guides:

• Pennsylvania Monthly Planting Guide — Full Year Calendar
• What to Plant in March in Pennsylvania
• What to Plant in April in Pennsylvania