When to plant in Pennsylvania
Pennsylvania spans USDA hardiness zones 5b-7a. Average last spring frost: late April. Average first fall frost: mid October. This calendar is anchored to Penn State Extension's recommendations, with timing adjusted for the dominant climate zone of the state.
Pennsylvania at a glance
| USDA hardiness zones | 5b-7a |
| Region | Mid-Atlantic |
| Average last spring frost | late April |
| Average first fall frost | mid October |
| Primary Extension service | Penn State Extension |
What grows particularly well in Pennsylvania
These are the crops, ornamentals, and trees Penn State Extension highlights as well-suited to Pennsylvania's climate:
- tomato
- sweet corn
- apple
- peony
- azalea
- dogwood
- witch hazel
Pennsylvania planting calendar
Dates are approximate and based on the dominant USDA zone for the state. For zone-specific timing, use the zone finder by ZIP code and frost date lookup tools.
Spring planting (after last frost: late April)
Cool-season vegetables (start 2-6 weeks before last frost outdoors): lettuce, spinach, peas, radishes, carrots, beets, kale, broccoli transplants, cabbage transplants.
Warm-season vegetables (after last frost, soil 60F+): tomato transplants, pepper transplants, beans (direct sow), cucumbers, squash, melons. See the seed starting timeline tool for indoor start dates.
Annual flowers (after last frost): zinnia, marigold, cosmos, sunflower, nasturtium.
Perennials, shrubs, trees: Plant in spring after soil thaws but before summer heat. Best window in Pennsylvania: 4-6 weeks after last frost.
Summer (June - August)
Maintenance season for most Pennsylvania gardens. Mulch heavily, water deeply (1 inch per week), pinch back mums for fall bloom, hand-pull weeds, harvest summer vegetables. Plant fall vegetable starts indoors by mid-July.
Fall planting (before first frost: mid October)
Cool-season vegetables (6-8 weeks before first frost): lettuce, spinach, radish, kale, broccoli, cabbage transplants. Per Penn State Extension, fall vegetable production can equal or exceed spring production with proper timing.
Spring-flowering bulbs: tulip, daffodil, allium, crocus, hyacinth. Plant 4-6 weeks before ground freezes. In Pennsylvania: typically October-November.
Perennials, shrubs, trees: Fall is the best planting season for woody plants in most of Pennsylvania - cooler temperatures + autumn rains reduce transplant stress. Plant 6+ weeks before first hard freeze.
Garlic: Plant cloves in October-November. Harvest the following July.
Winter (December - February)
Most of Pennsylvania is in dormancy. Tasks: order seeds, plan next year, dormant prune fruit trees (February), order bare-root plants for spring delivery. Avoid foot traffic on frozen lawns.
Common Pennsylvania challenges
Spotted lanternfly originated here; high deer pressure; clay soil in much of state; humid summers; emerald ash borer; oak wilt. For region-specific guidance, see our Mid-Atlantic regional gardening guide.
Where to get Pennsylvania-specific advice
The most reliable source for local growing advice is your county Extension office. Penn State Extension has county offices that provide free soil testing, plant disease diagnosis, and growing recommendations specific to your microclimate.
Visit Penn State Extension for the office nearest you.
Related tools and guides
- Find your USDA zone by ZIP code
- Look up your average frost dates
- Seasonal care calendar by zone
- Seed starting timeline calculator
- Mid-Atlantic regional gardening guide