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Seasonal guide
Amérique du Nord / États-Unis / Pennsylvania

What to plant in Pennsylvania in May

May in Pennsylvania marks a transition to warmer spring conditions, enabling a wide range of planting activities. With average temperatures rising and good rainfall, gardeners can focus on sowing both cool-season crops directly outdoors and starting warm-season varieties indoors for later transplanting. This month is crucial for establishing gardens before the onset of summer heat.

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Sowing

Recommended sowing

11 options
  • Lettuce

    Lettuce

    Direct sow outdoors. Choose heat-tolerant varieties for later harvests.

  • Radishes

    Radishes

    Direct sow outdoors. Succession plant every 1-2 weeks for continuous harvest.

  • Spinach

    Spinach

    Direct sow outdoors. May bolt in extended warm periods; choose bolt-resistant varieties.

  • Bush Beans

    Bush Beans

    Direct sow outdoors once soil has warmed sufficiently (above 15°C).

  • Carrots

    Carrots

    Direct sow outdoors in well-drained, loose soil. Keep soil moist during germination.

  • Beets

    Beets

    Direct sow outdoors. Thin seedlings to allow for root development.

  • Swiss Chard

    Swiss Chard

    Direct sow outdoors. Tolerates a range of temperatures.

  • Cucumber

    Cucumber

    Sow in protected seedbed / indoor tray. Transplant outdoors when risk of frost is past and soil is warm.

  • Zucchini

    Zucchini

    Sow in protected seedbed / indoor tray. Transplant outdoors when risk of frost is past and soil is warm.

  • Tomato

    Tomato

    Sow in protected seedbed / indoor tray. Transplant outdoors after all danger of frost is gone and night temperatures are consistently above 10°C.

  • Pepper

    Pepper

    Sow in protected seedbed / indoor tray. Transplant outdoors after all danger of frost is gone and night temperatures are consistently above 10°C.

Seedlings

Seedlings

3 options
  • Cabbage

    Cabbage

    Transplant pre-grown seedlings outdoors. Harden off plants before transplanting.

  • Broccoli

    Broccoli

    Transplant pre-grown seedlings outdoors. Provide consistent water to prevent bolting.

  • Cauliflower

    Cauliflower

    Transplant pre-grown seedlings outdoors. Requires consistent moisture and nutrients.

Tasks

Monthly tasks

Monitor for late frosts, especially early in the month. Continue weeding regularly to reduce competition for nutrients and water. Begin mulching around established plants to conserve soil moisture as temperatures rise. Harden off warm-season seedlings started indoors in preparation for eventual transplanting in June.