Vegetable Gardening in Pennsylvania: Complete Zone-by-Zone Guide

Pennsylvania is one of the best states in the country for growing your own vegetables — and one of the most misunderstood. Spanning five USDA hardiness zones, from Zone 7a in Philadelphia down to Zone 5a in the Pocono and Laurel Highlands, PA doesn’t have a single growing season. It has five overlapping ones. I’ve gardened across several of them, and the single biggest mistake I see PA gardeners make is following planting advice written for somewhere else.

This guide is built specifically for Pennsylvania. It covers what grows here, when to plant it by zone, how to handle our two distinct growing seasons (cool-season spring and fall windows, plus the warm-season summer window), and how to manage the challenges that are uniquely ours — late blight pressure, groundhog problems, Erie Lake effect, clay soils in the western counties, and the brutally short seasons in the mountain zones.

This post contains affiliate links. If you purchase through these links I may earn a small commission at no extra cost to you — thank you for supporting GetHandyOutdoors!

Pennsylvania’s Two Distinct Growing Seasons

Most vegetable gardening content treats the growing season as a single window — plant in spring, harvest all summer. In Pennsylvania, that misses half the opportunity. We have three distinct planting windows, and the most productive PA gardens take advantage of all of them.

Cool-season spring window (March–May): This is for crops that prefer soil temps of 45–65°F and can tolerate light frost: peas, spinach, lettuce, kale, arugula, radishes, carrots, beets, and broccoli transplants. In Zone 7a you can start direct-seeding peas in early March. In Zone 5a you’re waiting until late April for the same crops.

Warm-season window (May–September): Once soil temperatures consistently hit 60°F and frost risk is past, it’s time for tomatoes, peppers, cucumbers, squash, beans, corn, and basil. This window varies enormously across PA zones — Philadelphia gets nearly 5 months of frost-free summer warmth; Zone 5a mountain gardeners may get fewer than 120 days.

Cool-season fall window (July–September plantings): This is the most underused opportunity in PA gardens. The same crops that grew in spring will grow again in fall — and many of them taste better after a light frost. Kale, spinach, turnips, beets, and arugula all sweeten after frost exposure. You plant them in July and August to harvest September through November (and beyond with row cover).

Warm-Season Vegetables for Pennsylvania

These crops need both warm soil (above 60°F at planting, ideally 65°F+) and a long enough frost-free window to reach maturity. They are killed by frost and will stall in cool soil even if air temps look warm on the thermometer.

Pennsylvania’s warm-season all-stars, and what to know about each:

• Tomatoes: The most-grown vegetable in PA home gardens. For Zone 5a and 5b, always use transplants with a short days-to-maturity (under 75 days). Varieties like Early Girl (57 days), Stupice (65 days), and Sun Gold cherry (57 days) are reliably productive across all PA zones. In Zones 6a–7a you have room for long-season beefsteaks like Brandywine — but watch for late blight pressure in humid Western PA summers.
• Peppers: Bell peppers are the most demanding warm-season crop in PA — they need consistent heat and a long season. In Zones 5a–5b, stick with smaller-fruited varieties (Jimmy Nardello, Shishito, Carmen) that mature faster. Hot peppers (jalapeño, cayenne) are generally more productive across all zones than large bells.
• Cucumbers: Fast-producing and well-suited to PA’s humid summers. Bush varieties like Spacemaster work well in Zone 5b where space and season length are limited. In Zone 6a–7a, vining types like Marketmore 76 or Straight Eight give excellent yields.
• Summer squash and zucchini: Produces reliably across all PA zones. Even Zone 5a gardeners can get a full zucchini harvest. Watch for squash vine borers in mid-July — a PA-wide pest that can kill plants mid-season.
• Beans: One of the easiest crops across all PA zones. Bush beans (Provider, Dragon Tongue) go in as soon as frost risk passes and produce in 50–55 days. Succession-plant every 2–3 weeks through June for continuous harvest.

Cool-Season Vegetables for Pennsylvania

Cool-season crops thrive in PA’s spring and fall shoulder seasons, when daytime temps run 50–70°F and overnight temps dip without freezing hard. These crops actually prefer cool conditions — lettuce bolts (goes to seed) in summer heat, and broccoli heads that form in 90°F weather will be small and loose. The goal is to get these crops to maturity before summer heat arrives or after it breaks in fall.

• Peas: The first crop in the PA garden. Direct-seed as soon as the soil can be worked — even with frost in the forecast, peas tolerate it. Zone 7a: early March. Zone 5a: late April. Sugar Snap and Super Sugar Snap are the most reliable PA varieties.
• Lettuce and salad greens: Plant outside 4–6 weeks before your last frost, or start indoors 6–8 weeks before. Buttercrunch, Red Romaine, and loose-leaf mixes all perform well. For fall, plant by August 25 in Zone 6a and earlier in colder zones.
• Spinach: Hardy enough to overwinter under row cover in Zone 6a–7a if planted in late October. For spring harvest, plant as soon as soil is workable. Bloomsdale Longstanding and Space are reliable PA varieties.
• Kale: Grows in every PA zone and tastes best after frost. Lacinato (Tuscan) and Red Russian are the go-to varieties for fall harvest. Kale planted in early August will feed you from October through December in most of PA.
• Broccoli: Best as a fall crop in PA — spring-planted broccoli often rushes to bloom in summer heat before heads fully form. Start transplants in late June–early July for a September–October fall harvest. Belstar and Calabrese are proven PA performers.
• Garlic: Planted in fall, harvested the following summer. This is a uniquely productive PA crop — hardneck varieties like Music, Chesnok Red, and Pennsylvania Dutch Red thrive in PA winters. Plant in late September (Zone 5a) to early November (Zone 7a).

Zone-by-Zone Strategy for PA Vegetable Gardens

The same general principles apply everywhere in PA — but the tactics are very different depending on which zone you’re in.

Zone 7a (Philadelphia and SE corner): You have the most flexibility and the longest season in the state. Extend it further with fall plantings that continue well into November under row cover. You can also trial crops that struggle elsewhere: sweet potatoes, okra, long-season melons, and even some overwinter greens without protection. The trade-off is the urban heat island effect and heavier pest pressure (spotted lanternfly, aphids, hornworms).

Zone 6b (Reading, York, Lancaster, Bucks, Lehigh Valley): This is the “textbook PA garden” zone — most of the generic Pennsylvania gardening advice was written with this zone in mind. Lancaster County in particular has excellent soils. Focus on disease-resistant varieties; the humid summers favor early blight and late blight on tomatoes. A 3–4 week fall extension with row cover is easy and rewarding.

Zone 6a (Pittsburgh, Harrisburg, Allentown, central PA): Pittsburgh’s urban core often behaves like 6b in sheltered spots, but the surrounding hills are colder. Western PA gardeners should prioritize blight-resistant tomato varieties (Mountain Merit, Defiant PHR, Iron Lady) because the humid summers make Phytophthora blight devastating in some years. Harrisburg benefits from the Susquehanna River moderating temps.

Zone 5b (Scranton, Erie, Wilkes-Barre, State College): Erie’s Lake Erie effect is interesting — it delays spring warming but extends fall significantly, sometimes giving Zone 5b Erie gardeners a fall that rivals Zone 6a. Scranton and the Wyoming Valley gardeners face a more conventional short-season challenge: get transplants in on time, prioritize early-maturing varieties, and use low tunnels to extend both ends of the season.

Zone 5a (Poconos, Laurel Highlands, Northern Tier): This is a specialized growing environment. Your warm-season window can be as short as 120 days in some mountain valley bottoms — cold air pools in valleys can bring frost in August even in average years. Grow short-season varieties exclusively for warm-season crops: Stupice tomato (65 days), Jimmy Nardello pepper (85 days), Marketmore 76 cucumber (67 days). Cold frames, low tunnels, and wall-o-waters are not optional extras here — they’re how you reliably get a harvest.

Starting from Seed vs. Buying Transplants in PA

For cool-season crops like peas, spinach, beets, radishes, carrots, and beans — always direct seed. These crops don’t transplant well and there’s no advantage to starting them early.

For warm-season crops, the calculus depends on your zone:

• Tomatoes and peppers: Always start from transplants. Either start seeds indoors 6–10 weeks before your last frost date, or buy transplants from a nursery. Peppers especially need the head start — they’re slow to mature and won’t produce well if direct-seeded outdoors in PA.
• Cucumbers and squash: Prefer direct seeding in Zones 6a–7a where the season is long enough. In Zone 5b–5a, starting cucumbers and squash indoors 3–4 weeks before your last frost date gives you a meaningful head start.
• Broccoli and other brassicas: For fall crops, start from seed indoors in late June to early July and transplant out in late July to August. Buying transplants this late in the season is difficult at most nurseries, so starting your own fall brassicas is often the only option.

Common PA Vegetable Garden Challenges

Late blight (Phytophthora infestans): The single biggest tomato threat in PA, especially in humid summers across Zones 6a–7a. It spreads by wind and can wipe out an entire planting in days. Grow resistant varieties (Mountain Merit, Defiant PHR, Iron Lady, Juliet cherry), space plants for airflow, and don’t wet the foliage when watering. Penn State Extension’s late blight alert system (linked via their website) can tell you when spore pressure is high in your county.

Groundhogs (woodchucks): A ubiquitous PA garden pest, especially in suburban and rural areas. A groundhog can eat a bed of lettuce overnight. The only reliable fix is a physical fence: 3 feet tall hardware cloth with the bottom foot bent outward and buried 6 inches underground to prevent tunneling. Electric fence with a peanut butter bait wire is also effective.

Deer: Pennsylvania has one of the highest deer densities of any state. An 8-foot fence or a double-fence system (two 4-foot fences 4 feet apart) is the only completely reliable option. Repellent sprays help with light pressure but fail when deer are hungry and populations are high.

Spotted Lanternfly: Established throughout PA and expanding. While it primarily targets grapes and tree-of-heaven, SLF can stress vegetable plants when populations are very high. Scrape and destroy egg masses in fall and winter. Report sightings to the PA Department of Agriculture.

Heavy clay soils: Common in western and central PA. Clay drains poorly and warms slowly in spring — which compounds the challenge of getting warm-season crops in on time. Amend with compost (not sand — sand in clay creates a concrete-like mixture), and consider raised beds to bypass the problem entirely.

Pennsylvania Vegetable Planting Quick-Reference

Frequently Asked Questions